updated lbnl energy benefits of water metering 20160809 the... · kwh kilowatt hour lbnl lawrence...
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LBNL 1005988
Exploring the Energy Benefits of Advanced Water Metering
Michael A. Berger, Liesel Hans, Kate Piscopo, and Michael D. Sohn
Energy Analysis and Environmental Impacts Division Energy Technologies Area
August 2016
ERNEST ORLANDO LAWRENCE BERKELEY NATIONAL LABORATORY
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DISCLAIMER
ThisdocumentwaspreparedasanaccountofworksponsoredbytheUnitedStatesGovernment.Whilethisdocumentisbelievedtocontaincorrectinformation,neithertheUnitedStatesGovernmentnoranyagencythereof,norTheRegentsoftheUniversityofCalifornia,noranyoftheiremployees,makesanywarranty,expressorimplied,orassumesanylegalresponsibilityfortheaccuracy,completeness,orusefulnessofanyinformation,apparatus,product,orprocessdisclosed,orrepresentsthatitsusewouldnotinfringeprivatelyownedrights.Referencehereintoanyspecificcommercialproduct,process,orservicebyitstradename,trademark,manufacturer,orotherwise,doesnotnecessarilyconstituteorimplyitsendorsement,recommendation,orfavoringbytheUnitedStatesGovernmentoranyagencythereof,orTheRegentsoftheUniversityofCalifornia.TheviewsandopinionsofauthorsexpressedhereindonotnecessarilystateorreflectthoseoftheUnitedStatesGovernmentoranyagencythereof,orTheRegentsoftheUniversityofCalifornia.
ErnestOrlandoLawrenceBerkeleyNationalLaboratoryisanequalopportunityemployer.
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ABSTRACT
Recentimprovementstoadvancedwatermeteringandcommunicationstechnologieshavethepotentialtoimprovethemanagementofwaterresourcesandutilityinfrastructure,benefitingbothutilitiesandratepayers.Thehighlygranular,near‐real‐timedataandopportunityforautomatedcontrolprovidedbytheseadvancedsystemsmayyieldoperationalbenefitssimilartothoseaffordedbysimilartechnologiesintheenergysector.Whilesignificantprogresshasbeenmadeinquantifyingthewater‐relatedbenefitsofthesetechnologies,theresearchonquantifyingtheenergybenefitsofimprovedwatermeteringisunderdeveloped.SomestudieshavequantifiedtheembeddedenergyinwaterinCalifornia,howeverthesefindingsarebasedondatamorethanadecadeold,andunanimouslyassertthatmoreresearchisneededtofurtherexplorehowtopography,climate,watersource,andotherfactorsimpacttheirfindings.Inthisreport,weshowhowwater‐relatedadvancedmeteringsystemsmaypresentabroaderandmoresignificantsetofenergy‐relatedbenefits.Wereviewtheopenliteratureofwater‐relatedadvancedmeteringtechnologiesandtheirapplications,discusscommonthemeswithaseriesofwaterandenergyexperts,andperformapreliminaryscopinganalysisofadvancedwatermeteringdeploymentanduseinCalifornia.Wefindthattheopenliteratureprovidesverylittlediscussionoftheenergysavingspotentialofadvancedwatermetering,despitethesubstantialenergynecessaryforwater’sextraction,conveyance,treatment,distribution,andeventualenduse.WealsofindthatwaterAMIhasthepotentialtoprovidewater‐energyco‐efficienciesthroughimprovedwatersystemsmanagement,withbenefitsincludingimprovedcustomereducation,automatedleakdetection,watermeasurementandverification,optimizedsystemoperation,andinherentwaterandenergyconservation.Ourfindingsalsosuggestthattheadoptionofthesetechnologiesinthewatersectorhasbeenslow,duetostructuraleconomicandregulatorybarriers.InCalifornia,weseeexamplesofdeployedadvancedmeteringsystemswithdemonstratedembeddedenergysavingsthroughwaterconservationandleakdetection.Wealsoseesubstantialuntappedopportunityintheagriculturalsectorforenablingelectricdemandresponseforbothtraditionalpeakshavingandmorecomplexflexibleandancillaryservicesthroughimprovedwatertrackingandfarmautomation.
Keywords:waterresourcesmanagement,advancedmeteringinfrastructure,water‐energynexus,energyservices
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ACKNOWLEDGEMENTS
ThisworkwassupportedbytheU.S.DepartmentofEnergy’sOfficeofEnergyPolicyandSystemsAnalysisunderLawrenceBerkeleyNationalLaboratoryContractNo.DE‐AC02‐05CH11231.
WewouldliketothankDianaBauer,SandraJenkins,andAliceChaooftheU.S.DepartmentofEnergy’sOfficeofEnergyPolicyandSystemsAnalysisfortheirvaluablesupportandsuggestions.WewouldalsoliketothankArianAghajanzadehofLBNLforhisvaluablefeedback.
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TableofContents Introduction.....................................................................................................................................81.1 MethodsandScope................................................................................................................................81.2 TheWater‐EnergyNexus....................................................................................................................91.3 AdvancedWaterMetering...............................................................................................................12
EnergyBenefitsofAdvancedWaterMetering...................................................................172.1 EmbeddedEnergySavings...............................................................................................................172.2 ElectricLoadManagementandDemandResponse................................................................222.3 SupportingEnergy,Water,andClimatePolicyGoals............................................................26
ChallengesandBarriers.............................................................................................................283.1 ValueCapture.......................................................................................................................................283.2 WaterRights.........................................................................................................................................293.3 UtilityCoordinationandConflictingPriorities........................................................................30
CaseStudy:California.................................................................................................................324.1 Background...........................................................................................................................................324.2 EmbeddedEnergyofWaterinCalifornia...................................................................................324.3 PotentialforEnergyEfficiency.......................................................................................................354.4 PotentialforPeakLoadReduction...............................................................................................374.5 Summary................................................................................................................................................40
ConcludingRemarks...................................................................................................................41
FutureWork...................................................................................................................................42
References......................................................................................................................................44
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ListofFigures
Figure1:Energy‐waterflowdiagramshowingthemajorsourcesandsinksofbothwaterandenergyresourcesintheUnitedStates,usingdatafrom2011(USDOE“TheWater‐EnergyNexus”).Sectorsdiscussedinthisreportareoutlinedinred.........10
Figure2:High‐leveldiagramofadvancedwatermeteringsystem(Sensus2016).BasicAMIsystemsincludeasubsetoftheshownfunctionality,andinclude,ataminimum,smartwatermeters,acustomerportal,andcentralizeddatacollectionandprocessing.............................................................................................................................................15
Figure3:Non‐RevenueWaterperformanceofutilitiesinTheInternationalBenchmarkingNetworkforWaterandSanitationUtilities(IBNET)database(Kingdometal.2006)......................................................................................................................................................18
Figure4:Left,California’sInvestorOwnedUtilities’serviceterritories(CEC).Right,locationandsizeofCalifornia’sregulatedwaterutilities(CaliforniaWaterAssociation).30
Figure5:EnergyintensityrangebycomponentforCalifornia’sthreeIOUs(GEIConsultantsandNavigantConsulting2010)..................................................................................................35
Figure6:Averagedailydemandprofilesforapproximately35,000agriculturalcustomers’intervalmetersfromPG&E’sserviceterritory,2003‐2012.Figureshowshowdailyagriculturalloadprofileshaveflattenedsince2006,butstillpeakduringmid‐dayhours.ReproducedfromOlsenetal.(2015).......................................................39
ListofTables
Table1:Summaryofcommonwatermeteringtechnologies............................................................13
Table2:Summaryofcommonadvancedwatermeteringcommunicationstechnologies....14
Table3:Estimatedwaterandembeddedenergysavingsfromprogram‐relatedleakrepairs,andpotentialuntappedsavings(ECONorthwest2011)....................................................21
Table4:WaterandEnergyConsumptionbySectorinCalifornia....................................................33
Table5:RangeofEnergyIntensitiesWaterUseCycleSegment(CEC2005)..............................34
Table6:Summaryofestimatedwaterandenergyimpactpotentialforvariouswater‐relatedadvancedmeteringstrategiesinCalifornia.............................................................40
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AbbreviationsAB AssemblyBill
ADR Automateddemandresponse
AMI Advancedmeteringinfrastructure
AMR Automaticmeterreading
AS Ancillaryservices
AWWA AmericanWaterWorksAssociation
BG Billiongallons
CEC CaliforniaEnergyCommission
CPUC CaliforniaPublicUtilitiesCommission
DCU Datacollectionunit
DR DemandresponseDWR DepartmentofWaterResourcesEBMUD EastBayMunicipalUtilityDistrictGPM GallonsperminuteGW GigawattHEM HomeenergymanagementIHD In‐homedisplayIOU InvestorownedutilitykWh KilowatthourLBNL LawrenceBerkeleyNationalLaboratoryMG Milliongallons
MIU MeterinterfaceunitMNF MinimumnighttimeflowMTU MetertransmissionunitM&V Measurementandverification
MW Megawatt
NRW Non‐revenuewater
PUC PublicUtilitiesCommission
RF RadiofrequencySB SenateBill
SCADA SupervisoryControlAndDataAcquisition
SWP StateWaterProject(ofCalifornia)
TOU Time‐of‐useUSDOE UnitedStatesDepartmentofEnergy
VFD Variablefrequencydrive
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GlossaryofTerms
AdvancedMeteringInfrastructure(AMI):Atechnologysystemthatconnectscustomermeterstotheutilitythroughabi‐directionalcommunicationnetwork,suchastelephonewiresorradiofrequencytransmission,andstoresandanalyzesthecollecteddatainacentraldatabase.Utilitiescancollectmeterdataatfrequentintervals,relaythatdatatocustomers,andhaveadditionalcapabilities(e.g.remoteshutoff)dependingonthesystemconfiguration.
AutomaticMeterReading(AMR):Atechnologysystembywhichautilitycandigitallycollectandstoremeterreadings.Datacanbecommunicatedthroughhand‐helddata‐loggers,radiofrequencytransmission,ortelephonewires.Doesnotallowtwo‐waycommunicationbetweenutilityandmeters.
MunicipalWaterSystem:Theinfrastructurethatextracts,conveys,andtreatswaterforuseintheresidentialandcommercialsectors.Someindustrialcustomersarepartofthemunicipalsystem,howeverthemajorityself‐supplywater(Maupinetal.2014).
EmbeddedEnergyofWater:Theamountofenergyusedtocollect,convey,treat,anddistributewatertoendusers,andtheamountofenergyusedtocollect,transport,andtreatwastewater.
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Introduction
Thisreportidentifiesthewaysinwhichadvancedwatermeteringisbeingusedtoenableenergybenefitsandhighlightswhattheresearchsuggeststobeprominentareasoffutureopportunity.Thisreportisthesynthesisofacomprehensiveliteraturereview,interviewswithsubjectmatterexperts,andoriginalanalyses.Section1provideshistoricalcontextofthewater‐energynexusandwaterdevelopment,definescommonlyusedterminology,anddescribesthemethodsused.Section2isanin‐depthdiscussionoftheopportunitiesforenergybenefitsaffordedbyimprovedwatermetering.Section3highlightsbarriersandchallengestorealizingtheseenergybenefits.Section4exploresthescaleofopportunitiesandthebarrierstorealizingtheenergybenefitsofadvancedwatermeteringinCaliforniathroughahigh‐levelquantitativeanalysisanddiscussion.Sections5and6provideconcludingremarksandrecommendationsforfuturework.
1.1 Methods and Scope
Thisreportcoversthreebroadefforts.Ourfirsttaskwasaliteraturereviewofthreeprimaryareas:(1)thewater‐energynexus;(2)advancedmeteringinboththeenergyandwatersectors;and(3)applicationsofsynergisticwater‐energyactivitiesenabledbyimproveddatacollectionandsystemcontrol,whichincludesapplyingwater‐relateddatatoprovideenergybenefits(e.g.,energyefficiency).
Oursecondtaskwastogainanappreciationofthecurrentstateofpracticebyinterviewingexpertsfromacademia,industry,utilities,andregulatorybodies.Weinterviewedtwoacademicresearchers,tworesearchersfromindependentindustrythinktanks,engineersatafacilitiesdepartmentofalargecollegecampus,membersofastatepublicutilitiesandservicescommission,seniorengineersatamunicipalutilityresponsibleforprovidingbothwaterandenergy,anoperationsexpertatautility‐focusedsoftwarecompany,andasenioradvisoratanagriculturalsensorscompany.Duetotherecentdemandforresearch,technicalexpertise,andmarketsolutionsinthewater‐energyspaceintheSouthwesternUnitedStates,fouroftheseexpertsarefromCaliforniaandtwoarefromtheRockies.AnotherisfromtheMidwest,andtwoarebasedontheEastCoast.
Lastly,wepresentascopingstudyandfollow‐ondiscussionoftheenergybenefitsofadvancedwatermeteringinCalifornia.WechoseCaliforniaasacasestudybecausethereexistsmomentumfortacklingwater‐energyissuesfromregulators,industry,andconsumers.Thesignificantfour‐yeardroughtaffectingmuchoftheAmericanSouthwest,particularlyCalifornia,hasmotivatedabroadinterestinimplementingimprovedwatermetering.Wethereforeanticipatetheavailabilityofarelativelylargeamountofwater‐energydatafrompilotstudiesinthenearfuture.Finally,weseeincreasedactivitiesfrom
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regulatorsandotheragencies,includingtheCaliforniaPublicUtilitiesCommission(CPUC)andtheCaliforniaEnergyCommission(CEC),totackleresourceuseefficiencymatters.
Thisresearchfocusesprimarilyonthemunicipalandagriculturalsectors.Wesurveyedindustrialapplicationsofwatermeteringforenergybenefits,andconcludedthatmostindustriesforwhichenergyandwaterarevariablecostshaveinternalizedandattemptedtooptimizetheirprocesses.Additionally,industrialapplicationsvarywidelyingeographyandprocess,makinghigh‐levelscopingandassessmentunwieldy.Forthesereasons,furtherdiscussionofadvancedwatermeteringforenergybenefitsintheindustrialsectorhasbeenlefttothoseindustryexpertsbettersuitedtoadditional,tailoredanalyses.
1.2 The Water‐Energy Nexus
PeterGleick’sseminal1994report,“WaterandEnergy”,setthefoundationforunderstandinghowwaterandenergysystemsarefundamentallyinterconnected.Overthelasttwodecades,thewater‐energynexushasgainedattentionduetolocal,regional,national,andglobalconcernsregardingenergysecurity,waterscarcity,andtheimpactsofglobalclimatechange.Forexample,thehistoric2012‐2015NorthAmericanDroughtimpactedelectricitygenerationcapacitybyrestrictingsurfacewaterwithdrawalsusedforpowerplantcooling,aswellasdrasticallyreducinghydropowerresourceavailability(Pulwarty2013).Situationssuchasthishighlighthowwaterandenergysystemsareinextricablylinkedandthepotentialvulnerabilitiesthiscreates.Workhasalsobeendonetoquantifythemagnitudeofthelinksbetweenwaterandenergysystems,exemplifiedbyFigure1.
Asaresultofthegrowingappreciationofhowinterconnectedwaterandenergysystemsare,theUnitedStatesDepartmentofEnergy(USDOE)hasidentifiedareasinneedofproactiveandimprovedjointsystemoptimizationandmanagement(USDOE“TheWater‐EnergyNexus”).Inaddition,USDOEhasinvestedinextensiveresearchontechnologiesthatcanimprovetheenergyefficiencyofwatersystemsorreducetheuseofwaterduringenergyproduction,aswellaspoliciestoenhancetheeffectivenessofjointsystemsmanagement.
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Figure1:Energy‐waterflowdiagramshowingthemajorsourcesandsinksofbothwaterandenergyresourcesintheUnitedStates,usingdatafrom2011(USDOE“TheWater‐EnergyNexus”).Sectorsdiscussedinthisreportareoutlinedinred.
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1.2.1 Embedded Energy of Water
Theembeddedenergyofagivenunitofwaterishighlydependentuponthelocation,underlyingtopographyofthewaterinfrastructure,andwatersource(deMonsabertetal.2009).Forexample,a2005CECreportonwater‐relatedenergyusefoundthattheaverageembeddedenergyforNorthernandSouthernCaliforniawas4,000and12,700kWh/MG,respectively,withevengreaterspreadinembeddedenergyvaluesduetolocalsystemcharacteristics(CEC2005).Additionally,theenergyneededforprovidingwatercanbeasignificationportionofallenergyuse,withtheCEC’sreportestimatingthat5%ofenergyconsumptioninCaliforniacanbeattributedtotheconveyance,distribution,andtreatmentofwater.
Terminology: Energy for Water
Theliteratureregarding“energyforwater”systemslacksasetofagreedupondefinitionsforcommontermsandmetricsnecessaryforquantitativediscussion.Termsincluding“energyintensity,”“associatedenergy,”“embodiedenergy,”and“embeddedenergy”areoftenusedinterchangeablyandwithoutformaldefinition.Theterminologyusedthroughoutthisreportis“embeddedenergy,”andhasthefollowingdefinition.
“EnergyEmbeddedinWater”referstotheamountofenergythatisusedtocollect,convey,treat,anddistributeaunitofwatertoendusers,andtheamountofenergythatisusedtocollectandtransportusedwaterfortreatmentpriortosafedischargeoftheeffluentinaccordancewithregulatoryrules.(GEIConsultantsandNavigantConsulting2010)
Itisimportanttonotethat“embeddedenergy”specificallyandintentionallyexcludestheenergyuseassociatedwithwater‐relatedenduses(e.g.,residentialwaterheating),andistypicallyreportedasanamountofenergyperunitofwater(kWh/gallon).End‐usespecificenergyuseisexcludedfortworeasons:(1)thefocusofthisreportisonlarge‐scaleadvancedwatermeteringsystems,whichdonotdisaggregateend‐uselevelwaterandenergyuse;and(2)theenergyneededforspecificwater‐relatedendusesdeservesdetailedresearchonatechnology‐by‐technologyandend‐use‐by‐end‐usebasis,andisoutsidethescopeofthisstudy.
Additionally,“energyintensity”willbeusedthroughoutthisreportinreferencetotheamountofenergyrequiredperunitofwaterforindividualsegments(e.g.,wastewatertreatment)ofthewatersystem.
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Improvedwaterflow,pressure,andleakagedatacollection,enabledbyadvancedwatermeteringtechnologies,couldbettercharacterizetheembeddedenergyinwatersystems,whichinturncouldhelpidentifyandprioritizeresearchanddevelopmentopportunitiestotaplargepotentialefficiencygainsforbothwaterandenergy.Targetingwater‐energyprogramsinareaswheretheembeddedenergyishighest,forinstance,ismorelikelytoresultinsignificantenergysavingsthanprogramsinareaswheretheembeddedenergyofthewatersystemislow.Inordertofullycapitalizeonthesepotentialsavings,however,moreinformationabouttheenergyintensityofindividualprocesses(e.g.,freshwatertreatment),howthatenergyintensitydiffersbygeographyandtopography,andthetemporaldifferencesinenergyintensityisneeded(USDOE“TheWaterEnergyNexus”).
1.3 Advanced Water Metering
Sincethedevelopmentofthefirstcommercialmechanicalwatermeterinthe1850s(Walski2006),water‐meteringtechnologyhassteadilyimprovedinprecision,accuracy,andreliability.However,onlyrecentlyhavecommunicationstechnologiesimprovedandbecomecost‐effectiveenoughtochangehowthedatageneratedbythesemetersarecollected.Table1outlinesthecommonvolumetricandleakdetectionmetertechnologies,andTable2outlinesthecommunicationscomponentsthatrelaythemeterdata.
Traditionally,customer‐levelmeteringrequireswaterutilityemployeestophysicallyvisitindividualcustomersitesonasemiannualormonthlyscheduletoreadthewatermeter’slogger,whichonlyprovidesthetotalvolumeofwaterthathasbeenusedsincethelastreading,andhastobemanuallyenteredintoacentraldatabaseforbillingpurposes.Giventhetimeandlaborinvolved,thetraditionaloperatingmodelisanexpensiveprocessthroughwhichcustomersandutilitiesgainverylittleknowledgeofthetemporalaspectsofcustomerwateruse.Assuch,recentadvancementsinmeteringandcommunicationstechnologieshaveresultedindrasticallyimproved,moreintegratedmethodsofmetering,communication,datastorage,andanalytics.Twotechnologiestohavemajorimpactsonwatermeteringinfrastructureareautomaticmeterreading(AMR)andadvancedmeteringinfrastructure(AMI).
AMRisasysteminwhichthecustomermetersareabletosendconsumptiondataatregularintervalsthroughcommunicationinfrastructuresuchasradiofrequency(RF)ortelephonewires.NotonlydoesAMRallowformorefrequentdatacollection,butmostAMRsystemsalsoeliminatetheneedforutilityemployeestovisitindividualsites.However,itdoesnotallowtwo‐waycommunicationbetweenthemetersandtheutility(e.g.,theutilitycannotremotelytellthemetertochangerecordingbehavior).Forthisreason,metersinanAMRsystemarenotconsidered“smart”metersandareprimarilyusedinthewatersectortoreducethelaborcostofdatacollection.Improvedmeteraccuracyandstandardizingmeterinventoriesareadditionalbenefits(Kooetal.2015).
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Table1:Summaryofcommonwatermeteringtechnologies.
MeteringTechnology DescriptionNormalOperatingRange
Mechanical
1
Useseitherpositivedisplacementorvelocity‐basedmethodstomeasurevolumeofwaterconsumed.Theoverwhelmingmajorityofutilitymetersaremechanical,andtheyaretypicallyusedforresidentialandcommercialbillingpurposes.
NutatingDisk:0.25‐170GPM2
OscillatingPiston:1‐50GPM3
Multi‐jetImpeller:1‐100GPM4
Static
5
Usesstaticmeasurementmethods,suchasmagneticoracousticflowsensors,tomeasurevelocityofwaterflow,andthencomputevolumetricwaterconsumption.Muchnewerthanmechanicalmeters,staticmetershavebeenusedinindustrialandcommercialsettings,butareincreasinglycommonforresidentialapplications.
Ultrasonic:0.05‐160GPM6
Magnetic:0.7‐180GPM7
Compound
8
Incorporatesmultiplemeasurementtechnologies,typicallyonetechnologythatperformswellathighflows,andonethatperformswellatlowflows.Typicallyusedforcommercialormulti‐familyresidentialapplications.
0.5‐4000GPM8,9
AcousticLeakDetection
10
Deployedonwaterdistributioninfrastructure,thesesensorsusesoundwavestomeasureflowlevelsduringthenight,whenambientnoiseanddemandarelowest,andthenrelaysthedatatothecentralserverforanalysis.
N/A
1NiagraMeters,“NutatingDisc”2BadgerMeter,“Recordall®DiscSeriesMeters”3Sensus,“accuSTREAMTMMeters”4RG3Meters,“Multi‐Jet–BottomLoad–Meters”5Sensus,“AccuMAGTMWaterMeters”
6BadgerMeter,“E‐Series®UltrasonicMeters”7Sensus,“accuMAGTMMeters”8ZennerPerformance,“CompoundMeters”9BadgerMeter,“Recordall®CompoundSeriesMeters”10Sensus,“Permalog+AcousticMonitoringSensor”
AMIisthenaturalextensionofAMRtechnology,withmoresensorintegration,two‐waycommunication,systemcontrols,andreal‐timeanalytics.WaterAMIconsistsof“smart”watermetersthatmeasurethevolumeofwatertransferredbetweenlocationsandreportsthisinformationthroughbi‐directionalcommunicationwiththesystem’scommunicationsinfrastructure.Thisvolumetrictransactionistypicallyonlyrecordedwhenautilitytransferswaterfromitsownershiptoabuildingoperator,suchaswhenthewatercrosses
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autilitymeter,howeveritcanalsoberecordedwithinautility’sdistributioninfrastructureasameansofmonitoringflows(Janković‐Nišićetal.2004).Thesesmartwatermetersgivetheutilitymorecapabilities,includingflexibledatarecording,real‐timeanalyticslikeleak‐detection,andremoteshutoff(e.g.,inthecasewhenalargeleakisdetected).Thedatageneratedbythesmartwatermetersiscollectedandrelayedthrougharangeofcommunicationsinfrastructures(e.g.,RF,telephonewires)totheutility’scentralserver,wheredataiscleaned,analyzed,andstored.
Table2:Summaryofcommonadvancedwatermeteringcommunicationstechnologies.
CommunicationsTechnology Description Functionality
MeterRegister
1
Translatesmechanicalorsolid‐statemetersignalsintovolumetricreading.Displaysthisinformationvisually,storesitforcollection,ortransmitsittoanMeterInterfaceUnit(MIU)orMeterTransmissionUnit(MTU).
Dependsgreatlyontheregistertype.Minimumresolutionsaslowas1gallon.
MeterInterfaceUnit(MIU)orMeterTransmissionUnit(MTU)
2
Collectsreadingsfromindividualmeterregistersandcommunicatesthem,alongwithtimestampinformation,toaDataCollectionUnit(DCU).SomecanalsoacceptssignalsfromAMInetwork.
Typicallycollectsdataatintervalsbetween15minutesand1day.*
DataCollectionUnit(DCU)
3
CollectsandtransmitsdatafrommultipleMIU/MTUs.Technologyandusecasesvarygreatly.Infixednetworksystems,theyareoftenmountedontelephonepoles,andcommunicateviaradio.In“handheld”AMRsystemsDCUsaresmallhandhelddevicesthatcommunicatewithmetersviatouchorradio.
SomeDCUsstorecollecteddata(28daysor600,000transmissions4),butmanysimplyrelaydatafromMIU/MTUstocentralstorageandprocessingservers.
*Mostadvancedmeterscancollectandtransmitreadingsoncommand,andthereforethefrequencyatwhichconsumptionismeasuredisdictatedbytheutility’sneedsanddatamanagementandanalyticscapabilities.1BadgerMeter,“Recordall®TransmitterRegister”2BadgerMeter,“ORION®CellularEndpoint”
3Sensus,“StandardFlexNet®BaseStations”4Aclara,“STARNetworkDCUII”
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Inadditiontocustomer‐levelmeteringtechnology,allwaterutilitiesimplementsomelevelofSupervisoryControlAndDataAcquisition(SCADA)systems.SCADAisaremotemonitoringandcontrolsystemthatoperatesinreal‐timetoautomateandassistthemanagementoftreatmentandpumpingprocesses.SCADAsystemsmonitorandcontrolwaterandwastewatertreatmentplants,measuringanumberofimportantprocesscharacteristics,includinginflowsandoutflows,treatmentstatus,andwatertemperature.SCADAsystemsdonotinherentlystoreandanalyzepastdata,howeversomenewersystemsarecapableofbeingintegratedwithmoreadvancedanalyticaltools(Cherchietal.2015).
Figure2:High‐leveldiagramofadvancedwatermeteringsystem(Sensus2016).BasicAMIsystemsincludeasubsetoftheshownfunctionality,andinclude,ataminimum,smartwatermeters,acustomerportal,andcentralizeddatacollectionandprocessing.
ThewaterindustryistrendingtowardsAMIandmoreadvancedSCADAinfrastructure(Laughlin2003;Turner2005).Figure2showsadiagramofanadvancedmetering,sensors,andcontrolssystemanditsmanycomponentsandcapabilities.Thiswiderangeofdata
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collection,controls,andanalyticscapabilitiesallowwaterutilitiestoutilizeadvancedmeteringsystemstoreducewaterlossthroughimprovedleakdetection(Brittonetal.2013),reduceoperatingcoststhroughstreamlinedbilling(BealandFlynn2015),implementvolumetricratestructurestoincentivizewaterconservation(Borisovaetal.2014),andutilizehigh‐frequency,nearreal‐timedataforavariousstrategicsystemmanagementefforts(Stewartetal.2013).Endusersbenefitfrombehind‐the‐meterleakdetectionanddetailedinformationabouttheirwaterconsumption,bothofwhichcanleadtomoreefficientwateruseandlowerwaterbills(Brittonetal.2013).Moregenerally,advancedwatermeteringprovidesmoretransparentinformationaboutwhere,when,andhowwaterisconsumed,whichcanenableconservationandgreaterefficiency(PacificInstitute2014).Finally,whilewaterAMIsystemshavedemonstratedsignificantwaterconservation(Ritchie2015),theirvalueasanenergy‐savingtoolhasnotyetbeenthoroughlyexplored.
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Energy Benefits of Advanced Water Metering
Inthissection,wewillreportonthecurrentstateofwaterAMIinthemunicipalandagriculturalsectors,itsmarketpenetration,anditscurrentapplicationsforenergysavingsandbenefits.Itisimportanttonotethatquantifying,comparing,andprioritizingtheseenergyopportunitiesmustbedoneonacase‐by‐casebasisasapartofthecost‐benefitanalysisforanadvancedwatermeteringsystemsuchasAMI.
2.1 Embedded Energy Savings
2.1.1 Water Conservation Through Altered Behavior
Studieshavedemonstratedthatinformationprovidedbyadvancedmeteringofenergyandwatercanencouragebehavioralreductionsinconsumptionbyincreasingconsumerknowledgeabouttheirresourceuse.Webportals,textmessagealerts,andIn‐HomeDisplays(IHDs)areexamplesofcommunicationsplatformsusedtomakeresourceconsumptionmoretransparenttoconsumers.Intheenergysector,Faruquietal.foundthatIHDsthatdisplaythenear‐real‐timeinformationabouthomeenergyusecollectedbysmartmeterscanreduceenergyuseby7%(2010).Barissetal.foundthatasmartelectricitymeterrolloutto1,000customersinLatviaresultedinanaverage19%decreaseinelectricityconsumptioncomparedtoacontrolgroup(2014).Finally,ameta‐analysisofresearchon“feedback”mechanisms,whichincludesimprovedbilling,advice,andreal‐timeusagedata,andtheirimpactsonresidentialelectricityusagefoundthatfeedbackcanprovidesavingsbetween4and12%(Ehrhardt‐Martinezetal.2010).
Asimilaropportunityispresentinthewatersector.Implementingadvancedwatermeteringsystemsandprovidinguserswithmuchmoregranular,real‐timedataonwaterconsumptioncanresultinwaterconservation.Forexample,a2013paperbyFieldingetal.exploretheimpactofcustomer‐specificwateruseinformationonconsumptionpatterns,andfindthatdailyconsumptiondatafromsmartwatermeterscanreducewaterconsumptionbyanaverageof9%.Additionally,a2014pilotstudyatEastBayMunicipalUtilityDistrict(EBMUD),whichsupplieswaterthroughouttheSanFranciscoEastBay,installedwaterAMIsystemsthatprovidedhourlywaterconsumptiondata(inunitsoftenthsofagallonperhour)tocustomersthroughanonlinewebportal.EBMUDfoundwatersavingsbetween5‐50%,withanaverageof15%,amongresidentialcustomersaftertheinstallationofthesavings,whilenotingthatsomeofthesesavingsarelikelyduetocustomer‐sideleakrepair(EBMUD2014).Whenconsumersuselesswater,theembeddedenergynecessarytoprovidethatwaterisavoided,asthewaterutilityneedstoextract,treat,anddistributelesswater,reducingtheenergydemandsofthewaterutility.Unfortunately,veryfewstudiesquantifytheembeddedenergyreductionsattributabletothesewaterreductions.
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2.1.2 Leak Detection and Repair
Aswaterinfrastructureistypicallylocatedunderground,watermaindegradationanddamagefromsoilpressure,excavationandconstructionthreats,treerootgrowth,freeze‐thawcycles,andearthquakesarecommonoccurrences.Theresultingwaterleakagefromwatermainsintothesurroundingsoilarecalled“physicallosses”andarenotonlydifficulttodetect,butalsorepresentamajorsourceofwaterloss,knownasnon‐revenuewater(NRW),thatutilitiescannotfinanciallyrecoverorbilltocustomers.AnothersourceofNRWare“commerciallosses”,whichconsistofwaterthatflowsintoawatersystembutisnotcorrectlyaccountedforflowingoutofthesystem.Commerciallossesaretheresultoffaultyorinaccuratemeters,datahandlingerrors,orwatertheft.NRWiscalculatedusingEquation(1).
(1) %
100%
Whilecommerciallossesdonothaveassociatedenergyimpacts,physicallossesrepresentrealwastedenergyintheformofembeddedenergyandassociatedGHGemissions.Atypicalruleofthumbestimateforphysicalwaterlossesis10‐15%intheU.S.andcanbehigherindifferentpartsofthecountryandtheworld(Heringetal2013).Figure3showsthedistributionofNRW,asafractionoftotalwaterinputs,forutilitiesinTheInternationalBenchmarkingNetworkforWaterandSanitationUtilities(IBNET)database,whichcompileswaterutilitydatafromaroundtheworld.Onecanseethatover15%ofutilitiesintheIBNETdatabasehadNRWfractionsover50%in2006.
Figure3:Non‐RevenueWaterperformanceofutilitiesinTheInternationalBenchmarkingNetworkforWaterandSanitationUtilities(IBNET)database(Kingdometal.2006).
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IntheUnitedStates,itwasestimatedthat5‐10billionkWh/yearofelectricityisassociatedwithNRW,whichisapproximately6‐13%ofallelectricityusedbywateragenciesannually(AWWAWaterLossControlCommittee2003).TheWorldBankestimatesthat80%ofNRWindevelopedcountriesisduetoreallosses,whichmeansapproximately4‐8billionkWh/yearofelectricityiswastedthroughleaksintheU.S.Forperspective,thatisenoughelectricitytopower360,000‐720,000householdsannually(EIA2015).Theseleaksoccuron“bothsidesofthemeter,”meaningonthecustomer’sside(e.g.inhomes)andontheutility’sside(e.g.inwaterdistributioninfrastructure).Onthewhole,thefollowingdiscussionoftheavailableliteraturesuggeststhatasubstantialfractionofthewastedelectricityassociatedwithleakscouldbesavedthroughleakdetectionenabledbyadvancedmunicipalwatermetering.
Customer‐Side Leak Detection
TherecentDeOreoetal.report,“ResidentialEndUsesofWater,Version2”,foundthatleaksaccountfor13%ofallresidentialindoorwaterconsumptionacrosstheU.S.(2016).Customer‐sideleakscanbedetectedthroughanumberofmethods,includingwaterauditsandanalysisofwaterconsumptiondatathatrangeincomplexitybutaregreatlyimprovedwhencoupledwithanAMIsystem.OnewaterproviderinQueensland,Australiaanalyzedhourlyconsumptiondataforall22,000oftheirresidentialcustomersandidentifiedapproximately800householdsthathadcontinuouslyusedwaterfor48straighthours,indicatingahighlylikelihoodofleaks.Afterprovidingasubsetofthesecustomerswithextensiveanalysisoftheirminimumnighttimeflow(MNF)valuestocommunicatethepresenceofleaks,thewaterprovidersawan89%reductioninMNFwithinthesubset(Brittonetal.2013).TheCityofSacramento,California,beganimplementingawaterAMIsystemin2009.Afterinstalling17,600smartwatermeters,theymonitoredtheirperformancefrom2010‐2011.Throughanalysisofthevolumetricconsumptiondatacollected,1,076leakswereidentified,75%ofwhichwereverifiedinthefield.TheCityestimatedthatfixingtheseleakssavedanestimated236milliongallonsofwateroverthetwo‐yearperiod,orapproximately12.6gallonspercapitaperday(CaliforniaDWR2013).EBMUDhascompletedeightwaterAMIpilotprojectsthroughouttheirresidentialservicearea,includinganacousticleakdetectionsystem.TheAMIsystemscommunicatehourlyconsumptiondatawithresidentialcustomersviaawebportal,whichsendscustomersnotificationswhenconsumptionpatternsindicateasuspectedleak.Preliminaryresultsfromthesepilotprojectsindicatethatthesesystemshavebeeneffectiveatidentifying“asurprisingnumberofleaks”(EMBUD2014),andEBMUDhassincerequestedfurtherinformationfromvendorsregardingcurrentAMIsystemcapabilities(EBMUD2015).
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Utility Infrastructure Leak Detection
Expertshaveidentifiedthatdailywatersystemoperationscouldbedrasticallyimprovedwithbetterdata(Tarrojaetal.2016).Byaugmentingcurrentoperationalmodelsandprocedures,largelybasedonSCADAsystemdata,withwaterAMIdata,expertssuggestedthatthedevelopmentandapplicationofadvancedalgorithmstoquicklyandaccuratelydetectleakscouldrealizesubstantialoperationalcostsavings.Theseanalyticalcapabilitiescouldenablewaterutilitiestotakepreventativemeasuresbyidentifyingminorleaksbeforetheybecomeexpensivecatastrophicpipefailures.However,utility‐sideleakdetectionistypicallymorecomplexthancustomer‐sidedetection,primarilyduetothenumberofinputsandoutputspresentinwaterdistributionnetworks.Anumberofstudieshaveproposedsolutionstothistechnicalproblem.Zanetal.discusshowdatafromflow,pressure,andacousticsensorscanbeanalyzedwithjointtime‐frequencyanalysistodiagnoseleaksinamunicipaldistributionsystem(2014).Gouletetal.(2013)andColomboetal.(2009)showdifferentmethodsusingflowandpressuredatarecordedathighfrequencythatcouldbeadequateinprovidingleakdetection.Loureiroetal.demonstratehowtoleveragesmartwatermeterdatatoperformwaterbalancesondistrictmeteredareas(discreteanddistinctsectionsofwaterdistributioninfrastructure)inordertodetectleaks(Loureiroetal.2014).Inthefield,citiesofLeesburg,VirginiaandMonaca,PennsylvaniareducedtheirNRWfrom15%to7%and50%to15%,respectively,afterinstallingAMItodiagnoseandreducedistributionleaks(Richie2015).
OneoftherarestudiesthatestimatesembeddedenergysavingsassociatedwithwaterefficiencyprojectsisECONorthwest’s2011study,“EmbeddedEnergyinWaterPilotProgramsImpactEvaluation”,whichanalyzes9pilotprogramsimplementedbyCalifornia’sthreeenergyIOUsincollaborationwithlocalwaterutilities.Oneofthereport’skeyfindingscamefromaSouthernCaliforniaEdison(SCE)leakdetectionprogramthatutilizedwateraudits,supportedbyvolumetricwatermeterdata,toidentifyleaksinwaterdistributioninfrastructureforthreewateragencies:
“SCE’sLeakDetectionprogramappearstoofferthegreatestenergysavingspotential(atrelativelylowcost)amongallthePilotprograms.Inparticular,theenergysavingsdocumentedinthisreportarebasedonleaksthatwereactuallyrepairedduringtheprogramperiod;potentialachievablewater(andenergy)savingswereestimatedtobemuchhigherbytheprogramimplementationcontractor.”
Whilethispilotprogramwasnotutilizinga“smart”watermetersystem,butratherperforminganalysisonhistoricaldata,itdiddemonstratethatthemagnitudeofenergysavingsassociatedwithleakrepairissignificant.TheestimatedannualwaterandenergysavingsforthisprogramarereportedinTable3.
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Table3:Estimatedwaterandembeddedenergysavingsfromprogram‐relatedleakrepairs,andpotentialuntappedsavings(ECONorthwest2011).
Water(MG)Energy–Agency
(kWh)Energy‐All
Sources(kWh)
SavedfromRepairs
83 178,143 497,788
PotentialSavings 263 583,277 1,662,621
Energysavingsareshownforboththewateragency(Energy–Agency),andfromallsources(Energy–AllSources),whichtypicallyincludesextractionorconveyanceofwaterforwhichtheagencyisnotresponsible.
Identifyingleaksindistributioninfrastructurebeforecatastrophicpipefailuresoccurcansavetheutilitytime,money,andlaborwhilealsoreducingtheembeddedenergyrequiredtoprovidewaterthroughoutthesystem.AlthoughfurtherresearchisneededtobetterquantifyandcomparethecostsandbenefitsofusingAMI,acousticleakdetectionsensors,SCADA,oracombination,manytechnologiesthatcanperformleakdetectioncurrentlyexist.Additionalpilottestsonalargerscalecouldfurtherimproveourunderstandingofthebarrierstoadoptionandoptimaldeploymentstrategies.
2.1.3 Energy Efficient Infrastructure Design and Operation
Currently,waterinfrastructureisdesignedtomeettheflowrequirementsneededatabsolutepeakdemand,andtheabsolutepeakdemandiscomputedusingengineeringestimatesofmaximumdailyconsumptionandnotnecessarilyontheanalysisofhistoricalconsumptiondata.Pumpsareselectedtomeetpeakdemandandarenotoperatedintheiroptimalefficiencyattypicaldemandflows.Ineffect,thismeanswaterinfrastructureisoverdesignedforthemajorityofdemands,whichmayleadtoinefficientoperationandthushigherembeddedenergyofthewaterdeliveredbythesystem.Thisrelianceonengineeringbestestimatesofpeakflows,ratherthanaconsumption‐databaseddesignapproach,couldalsobeincreasingthecosttobuildandmaintainwaterinfrastructure.FurtherresearchisneededonhowbesttointegratethewealthofhighlygranularwaterAMIdataintosystemandinfrastructuredesignpractices.
WaterinfrastructureintheUnitedStatesandthroughoutmuchoftheworldisquiteold,andisthereforeconstantlybeingmaintained,replaced,improved,andexpandedtomeetthegrowingneedsofindustry,rapidlyurbanizingdemographics,andagrowingpopulation.Aswaterinfrastructureistypicallyunderground,repairingandreplacingpipesisexpensive.Thissituationpresentsopportunitiestoleveragethehigh‐quality,high‐resolutiondatafromAMIsystemstoprioritizetherepairandreplacementofsystem
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components.Sincewaterutilitiesareoftenbudgetconstrainedandpipereplacementisdonebasedonbest‐guesspipe“lifetime”schedules,itisnotuncommonforutilitiestospendhundredsofthousandsormillionsofdollarstoexcavateandreplacepipesthatareingoodcondition.Thisinefficiencycouldbereduced,andtheembeddedenergyofthewatersystemloweredduetolowerwaterlossrates,ifutilitieshadadvancedwatermeteringdatatoidentifyandprioritizeleakingpipesforreplacementratherthanusingtraditionalrule‐of‐thumbreplacementperiods.
Dataaboutchangesinwaterdemandpatterns,providedbyAMI,couldinformimprovedmedium‐tolong‐termwaterforecastingmodels.TheimprovedaccuracyoftheseAMI‐supportedmodelscouldprovideutilityoperationalmanagersthecontrol,feedback,andmonitoringcapabilitiestomorereadilyalterconveyanceanddistributionpumpingpatterns.Thesemodelscouldalsoimproveinfrastructureredesignbyidentifyingareaswherethedistributionnetworkisover‐orunder‐designed,ideallyleadingtomoreoptimalsizingofpipesandpumpsaswellasimprovedsitingofpumping,storage,andmonitoringresources.Moregranularandreal‐timedataaboutwaterconsumptionthroughoutawaterdistrictcouldalsobebetterlinkedtothedistrict’senergyuse,andhelptoquantifypumpshiftingopportunitiesfordemandresponseorsupportthesitingprocessforadditionalwaterstorageinfrastructure.
Additionally,pressuremanagementofwaterdistributionssystemshasbeenshowntoloweroverallleakageratesandenergyuse.Xuetal.found thatreducinginletpressuretoadistributionsystemby14%ledtoan83%reductioninminimumnightflow(MNF)andanassociatedsavingsof62,633cubicmetersofwater,1.1x106MJofenergy,and68tonsofCO2equivalentgreenhousegasemissionsperyearperkilometerofpipe(2014).However,duetothevariablenatureofdistributionsystemstructure,operation,andwaterqualityrequirements,theauthorsobservethattheseresultscannotbedirectlyextrapolatedtoothersystems.Pressuremanagementapproachescanbesupportedbyimprovedwatermetering,throughbothSCADAandAMIsystems,whichmayallowforloweroperatingpressures,thoughfurtherresearchanddemonstrationworkisneededbeforeconclusionscanbedrawn.
2.2 Electric Load Management and Demand Response
Waterinfrastructureisasignificantcontributortopeakelectricaldemandsonthegrid,andthereforepresentsanopportunityforpermanentloadmanagementanddemandresponse(DR).Forexample,theCaliforniawatersupplyaloneisestimatedtorequire2‐3GW,or3‐5%ofthestate’stotalelectricitydemand,onpeakdays(Fujitaetal.2012;CEC2005).Opportunitiestoshiftorreducethepeakdemandfromthewatersectorcouldaddresspeaksystemdemandissues,potentiallyresultinginlowerelectricitypricesandreducingthelikelihoodofdemandexceedingcapacity.Additionally,waterisreadilystorable,andwater
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systemsfacedifferentconstraintsthanelectricalsystems,makingwater‐relatedenergyapotentiallyflexibleandreliableDRresource.Improvedwaterdemandforecasting,enabledbyadvancedwatermetering,couldsupportsystemoperatorsandencouragecustomerstoshifttheirwaterdemandsoutofpeakelectricitydemandperiods.
2.2.1 The Municipal Sector
Olsenetal.estimateanaverageofapproximately1.1GWofmunicipalpumpingdemand,whichdoesnotincludelargewaterconveyancesystems,duringsummermonthsintheWesternInterconnection,ofwhichapproximately15MWisreadilyavailableforDR(Olsenetal.2013).Whileindividualcustomersarefarremovedfromthepeak‐electricityimpactsoftheirwateruse,waterutilitiesresponsibleforconveying,treating,anddistributingwateroftenfacetime‐of‐use(TOU)energyprices,whichincentivizesthemtominimizethecostsassociatedwithusingenergyduringpeakhours.Ourinterviewswithwaterandenergyutilityexperts,aswellasobservationsfromtheliterature,indicatethatsomeutilitieshaveimplementedadvancedwatermeteringandwaterstoragetohelpthemshiftsomepumpingandtreatmenttooff‐peakhourstoreducetheirenergycosts(Fujitaetal.2012;Cherchietal.2015),whileothersparticipateinelectricdemandresponseprograms(EPRI2013).However,therearestillveryfewreportsthatdemonstrateandquantifyexamplesofwater‐AMI‐supportedresponsiveloadmanagement.
Onthecustomersideofthemeter,increasingconnectivity,epitomizedbytheInternetofThings(IoT)concept,willlikelyaffectwater‐relatedenergyconsumptionthroughbehaviorchangeandadvancedhomeautomation.A2010CECstudyonresidentialpeakelectricaldemandfoundthatcustomerswhowereaskedtominimizetheirwaterconsumptionduringtheelectricalutility’son‐peakperiodusedapproximately50%lesswaterduringpeakelectricityhoursascomparedtoacontrolgroupwhowasnotprovidedthismessaging(House2010).Ifimplementedacrossthewateragency’stotalresidentialpopulation,thestudyestimatedtheregionalwaterdistrictcouldreducetheirpeakelectricloadby3MW.Thestudyproposedthatalikelyexplanationofthisreductionisconsumersshiftinglawnirrigationtoeveningornighttimehours.Otherexamplesofthissortofdemandshiftingflexibilityinclude“smart”appliances,suchasclotheswashersanddriers,connectedthroughtheIoTtoahomeenergymanagement(HEM)system.SuchHEMsystemsarecapableofshiftingapplianceloadstooff‐peakhourswithminimaleffectsonlevelofservice.Thesetypesofhomemanagementsystemscanbeexpensive,butitispossiblethatintegratingwatermanagementintoahomeenergyandwatermanagementplatformwouldprovideco‐benefits.Forexample,AMI‐enabledpricingstructures,suchastime‐of‐usewaterprices,couldincreasetheabilityofthesehomemanagementsystemstocapturevaluefortheconsumer.
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2.2.2 The Agricultural Sector
Theconceptofjointenergyandwatermanagementisbecomingincreasinglyimportantintheagriculturalsector,asgrowersmaketheswitchfromwaterinefficientfloodirrigationtoadvancedwater‐efficientprecisionirrigationsystems.Althoughmodernizedirrigationmethodsusemuchlesswater,theyaretypicallymoreenergyintensiveduetotheneedtopressurizeextensivepipingsystems.OnestudyestimatesthatthemodernizationofSpain’sirrigationsystemsfrom1950to2007reducedthewaterperhectareoffarmingby21%,butincreasedtheenergyperhectareby657%(Corominas2010).AnotherstudyoftwoirrigationdistrictsinAustraliafoundthatswitchingfromgravityfedirrigationtopressurizedirrigationcouldincreaseelectricityintensities,intermsofenergyperunitare(MJ/hectare),by8‐179%dependingoncroptype(Jackson2009).Asthreatstowatersecuritygrow,includingashiftingclimateanddwindlinggroundwaterreserves,theyacceleratethetransitiontowaterefficientirrigationsystems,andtheagriculturalsector’senergydemandsarelikelytoincrease.Olsenetal.estimateagriculturalwaterpumpingcurrentlycontributes2.7GWofloadduringsummermonthsintheWesternInterconnection,ofwhichapproximately400MWisreasonablyavailableforDR(Olsenetal.2013).Giventhisenergy‐watertradeoff,developingsystemsthatimprovetheflexibilityofagriculturalwaterandenergydemandsareanticipatedtobegrowingareasforbothR&Dandadvancedwatermeteringapplications.
Onemethodcurrentlyusedintheagriculturalsectoristhepracticeofshiftingwaterpumpingtooff‐peakperiods,whenthedemandontheelectricitygridislowest.Factorsthatlimittheeffectivenessofthisdemandmanagementstrategyarethetotalvolumeofwaterstorageavailableinasystem,themaximumcapacityofpumpsabletomovewaterintoasystemafterpeakhours,waterdeliveryschedules,andtheuncertaintyinwaterdemandforecasting(Marksetal.2013).Thisstrategycanbeusedbyindividualfarmsthathaveon‐sitestorage,butisoftenmostcost‐effectiveforirrigationdistricts.Forexample,theElDoradoIrrigationDistrictlowereditsminimumstoragetanklevelsandinstalledanadditional5‐million‐gallonstoragetank,whichreduceditson‐peakelectricityusagebymorethan60percent(CEC2005).Third‐partyDRaggregatorshavealsobegunfocusingontheagriculturalcommunity,andmanualDRparticipationhasincreasedamonggrowersrecently.
Inourinterviewswithexpertsfromtheagriculturalsector,theyindicatedthat,inordertoimproveoperationalflexibilityonafarm,growersneedtheconfidencetobewillingtochangeirrigationscheduleswithrelativelylittleadvancenotice.TheseassertionsaresimilartothosemadebyOlsenetal.,whoindicatethattheremainingissuesstilllimitingtheparticipationofagriculturalcustomersinDRinclude(1)insufficientoperationalflexibilityand(2)insufficientcommunicationandcontrolinfrastructure(2015).Sincemaximizingcropyieldswhileminimizingcroprisksisthegrowers’primarygoal,theyoften
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seeimpromptuchangestoirrigationashigh‐riskpropositions.ThisexplainswhymostDRintheagriculturalsectoriscurrentlycontrolledmanually;growersreceiveadvancednoticeofDReventsanddecidewhethertomanuallyshutoffpumpsandotherprocesses.Withoutcommunicationandcontrolinfrastructureinplace,participationinDRinvolveshightransactioncosts,makingitdifficulttosecurelargequantitiesofreliableDRfromtheagriculturalsector.
Automateddemandresponse(ADR)isatechnologyandcommunicationsstrategythatallowsirrigationcontrolsystemstoautomaticallyandrapidlyrespondtoDRsignalsfromthegrid,whilestillleavingthegrowertheabilitytooverrideaDReventcalliftheydeemitnecessary.EnablinganirrigationsystemforADRcanfaceresistance,however,duetotheneedforinstallingvariablefrequencydrives(VFDs)and/orautomaticpumpcontrols,thepossibilityofchanginggrowers’irrigationhabits(Marksetal.2013),andtheaddeduncertaintythatanirrigationscheduleoptimizedforpeakloadshiftingmayharmcrophealth(Olsenetal.2015).Oneoutstandingtechnologicalgapisdevelopingamethodforestimatingrisktocropusingdata‐drivenalgorithmsandforecasting.However,growerstypicallydon’thaveaccesstoreal‐timedataonplantandsoilmoisturelevels;only12%ofgrowersintheUnitedStatesuseeithersoilorplantmoisture‐sensingdevicestohelpdeterminewhentowatercrops(USDA2013).Expertsalsoproposedthaton‐farmadvancedwatermeteringcouldhelpalleviatethisconcernbyquantifyingwatervolumesdispensedand,throughdata‐drivenalgorithms,estimatingriskofcropdamage.Thesealgorithmshavenotyetbeendeveloped,butpresentanopportunityforlesseningthepotentialriskfromoperationalchangessuchasdailyloadshiftingorfast‐responseDR.DemonstrationprojectscouldbeinstrumentalinquantifyingtheDRpotentialandinprovidingtheevidenceneededtoameliorateconcernsofcroprisk,resultinginasubstantialincreaseintheamountofDRpotentialrealizedintheagriculturalsector.
Lookingtoafutureelectricgridwithgreaterintegrationofintermittentrenewableenergyresources,therearelikelytobelargeancillaryservices(AS)marketstosupportgridreliabilityandefficiency.CurrentmanualagriculturalDRresourcescanprovidepeakloadshedding,seenastraditionalDR,butarenotcapableofsupplyingthehighlycontrollable,rapidresponseresourcenecessarytoprovideAS.However,agriculturalsystemscomposedofmechanicalpumps,waterstorageintheformofstoragetanksandpotentiallyin‐soilstorage,representahighlyflexibleresourcethatcouldtheoreticallybecapableofprovidinglargequantitiesofAS.Furtherresearchintoirrigationpumps’controllability,responsetime,andpracticalityisstillnecessarytoquantifythemarketpotentialforprovidingsuchenergyservices.
Inourinterviewswithexperts,theyseeagenerallyslowrateofadoptionofAMItechnologiesinthissector.Wehaveheardmanyanecdotalexplanationsforthis,including:concernsoflosingcontrolofanirrigationschedule;anincreasedrisktocrops;anda
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generaldisinterestinhavingwaterusemonitored,recorded,andmadeavailabletoothers.However,furtherresearchisneededtobetterunderstandthesebarrierstoadoptionandtheassociatedopportunitycosts.
2.3 Supporting Energy, Water, and Climate Policy Goals
Withincreasingconcernsaboutgreenhousegasemissions,waterscarcity,andnaturalresourcemanagement,municipalitiesworldwidearefacingstricterregulationsregardingwaterandenergyefficiencyaswellaspressuretoprovideevidencethataresourcemanagementprogramisachievingthosegoals.Anumberofstudieshavesuggestedthatenvironmentalgoalscanbemetmoreefficientlyandeconomicallybyapproachingenergyconservationthroughwaterusage;forexample,in2005,theCECreportedthatCalifornia’sstateenergyefficiencygoalscouldbemetbyfocusingsolelyonwateruse,athalfthecostoftraditionalenergyefficiencytargets,astheenergysavingsassociatedwithwaterefficiencyare,onaverage,lessexpensivetoachieve(CEC2005).However,thereisstillconsiderableuncertaintyabouthowtoaccuratelymeasuretheembeddedenergyinwater,quantifycostsavings,allocateenergyreductions,anddevelopatransparentmetricforjointwater‐energyprograms(CooleyandDonnelly2013;YoungandMackres2013).ThewealthofdatageneratedbywaterandenergyAMIsystemscouldprovidecrucialevidence,andnotonlyimproveourunderstandingofwaterandenergyconsumption,butalsoidentifyareaswiththegreatestpotentialforimprovedstrategicresourcemanagement.
2.3.1 Measurement and Verification
Measurementandverification(M&V)iscommonlyundertakentoquantifythebenefitsofanenergyorwaterefficiencymeasure,andiscrucialtoestablishingitsvaluetofacilityowners,operators,customers,andutilityprograms.M&Vinvolvesfirstdocumentingtheenergyand/orwateruseofafacilitybeforeandafteranefficiencymeasureisinstalled,thenquantifyingandattributingchangesinusagetothemeasures.Intheenergysector,M&Veffortscancomprise1‐5%ofportfoliocosts(Jayaweeraetal.2013).ImprovedandautomatedM&VmethodsthattypicallyrelyonAMIdatacangeneratemorereliablebaselinestopredictwhattheenergyusemighthavebeenifameasurewasnotimplemented(Grandersonetal.2011).TheseAMI‐basedM&Vmethodscanbefasterandmoreaccurate,whichenablesmorecosteffectiveenergyefficiencyprograms(Grandersonetal.2015).RecentresearchsuggeststhatcoordinatedAMIsystemscanreducetheuncertaintyincostandbenefitvaluation,allowformoretransparentcomputations,andimprovetheattributionofcostsandbenefits(YoungandMackres2013).
2.3.2 Program Design and Prioritization
InadditiontotheM&Vofjointwater‐energyprograms,waterAMIdatacancontributesubstantiallytosupportingtheprioritizationofthemosteffectivewaterandenergy
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conservationstrategies.ThisishighlightedinStewartetal.’s2010paper,“Web‐basedknowledgemanagementsystem:linkingsmartmeteringtothefutureofurbanwaterplanning”.Australiafacedsignificantsustaineddroughtduring2002‐2012,whilewaterdemandgrowthforecastsindicateda37%growthbetween2001and2031(Birrelletal.2005).Stewartetal.observedthat,whiletherewerenumerousstrategiesbeingimplementedforresourcemanagementduringthisseveredrought,therewasofteninadequatedatatosupportwhichsolutionshadthemostprofoundorimmediateimpactsonwaterdemand.Stewartetal.proposedaweb‐basedknowledgemanagementsystemtoleveragetheinstalledwatermeteringtechnologytoimproveinfrastructureplanningandmanagement,waterdemandmanagement,andcommunicationofwaterconsumptionmetricstocustomers.Finally,Stewartetal.arguedthatdatafromwaterAMIisimperativetomanagetheincreasingstressonAustralia’sever‐shrinkingwatersupply.
Intheagriculturalsector,irrigationdistrictsandfarmstypicallycollectverylittledataaboutwaterconsumption(surfaceorgroundwater),whichcanbealostopportunityforimprovedon‐farmwatermanagement.AwaterAMIsystemthatalsohassoilmoisturesensors,forinstance,couldaidinlinkingwaterandenergyuseinwaysthatallowgrowerstooptimizetheseresourcesjointly(Riversetal.2015;ShuklaandHolt2014).Further,thedearthofoperationaldataaboutwhereirrigationwatercomesfrom,howandwhenitisappliedtofields,andtheenergyassociatedwithconveyingwateranddeliveringthroughanirrigationsystemleadstogreatuncertaintiesabouthowtobestdesignandimplementutilityandregulatoryprogramsthattargetenergyandwatersavings.Asasubstantialknowledgegap,werecommendstudiesfocusedoncollectingthisinformationinordertoconductareliablescopingstudyexaminingthepotentialcostsandbenefitsoffurtherworkinthisarea.However,nopilotstudiesorquantitativeinformationexistsonthevalueofwater‐energyinformationinagriculture.
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Challenges and Barriers
Inordertoachievewidespreadadoptionofadvancedwatermeteringanditsjointutilizationbyboththewaterandenergysectors,anumberofchallengesandbarriersneedtobeaddressedandovercome.Weidentifiedthreeprimarychallengesandbarrierstotheutilizationofadvancedwatermeteringtorealizeenergybenefits:(1)howwaterutilitiescapturevaluefromtheenergyservicesprovidedbywatermetering;(2)theimpactofwaterrights,especiallyappropriationdoctrineintheAmericanWest,onincentivestoinstallwatermetersandsharethemeterdatawiththepublic,regulatorybodies,orutilities;and(3)effectivecoordinationandcooperationbetweenwaterandenergyutilities.
3.1 Value Capture
Advancedwatermeteringsystemscanbeexpensivewhencomparedtotraditionalmeteringdevices.Projectcostsrangewidelybasedonthenumberofcustomers,thespecificmeteringandcommunicationstechnologiesselected,thelevelofsoftwareintegration,andthestateofmeteringsystempriortoAMI/AMRimplementation.AsurveyofwaterAMIandAMRprojectsinAustraliaandNewZealandfoundprojectcostsrangingfromaslowas$45,000tosimplyupgrade5,000watermeterstosmartwatermeters;toashighas$36MtoinstallafullAMRsystemfornearly60,000residentialandnon‐residentialmeters(BealandFlynn2015).Additionally,Bealetal.foundthat,of16fundedadvancedwatermeteringprojectssurveyedinAustraliaandNewZealand,9(56%)werewhollyfundedbythewaterutilityand15(94%)wereatleastpartiallyfundedbythewaterutility,withfundingpartnersincludingfederalandstategovernments,schools,andfarmers.Thesamestudyfoundthatutilitiesmostoftenidentifiedreducingnon‐revenuewaterastheirtoppriority,withimproveddemandforecastingasanotherpopularmotivation.Whilebothoftheseprioritieshavedirecttiestoenergybenefits,asreducingnon‐revenuewaterreducesembeddedenergylostinthesystemandimprovingdemandforecastingimprovesawaterutility’sabilitytoprovideelectricDRservicesbyreducingtheriskthatdeferringpumpingwillresultininsufficientsupply,noneofthesebenefitswerequantifiedbythestudy.
Manywaterdistrictshaveobservedthat,duetohighcapitalcosts,makingthebusinesscaseforwaterAMIiscurrentlydifficult(Zunino2015).WhilepilotstudiesarebeginningtodemonstrateandquantifytheassociatedenergybenefitsofwaterAMI,thequestionoftenremainsastohowwaterutilitiescaptureandfullymonetizethesebenefits.Howthisquestionisresolveddependsonstateandlocalpolicies,whichareoftendeterminedbystatePublicUtilitiesCommissions.Forexample,theCaliforniaPublicUtilitiesCommission(CPUC)iscurrentlyintheprocessofimplementinganembeddedenergycostcalculatorintoitsenergyandwaterefficiencyprogramevaluations.TheoveralllackofvaluationanalysisoftheenergyandGHGbenefitsofwaterAMIremainsasignificantgapintheopen
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literature.AmorethoroughunderstandingoftheenergybenefitsandclearerpathwaystocapturingthesebenefitsforthewaterutilitycouldimproveAMI’sbusinesscase,andpossiblyspurmorewidespreadadoption.
3.2 Water Rights
Inorderforadvancedwatermeteringdatatobecollectedandutilized,regulatory,operational,andlegaldisincentivesneedtobelessenedorremovedentirely.AmajordisincentivetothecollectionandsharingofwaterdataintheAmericanWestishowwaterrightsaredetermined.WaterrightsintheAmericanWestaregenerallyprior‐appropriationrights(USArmyCorpsofEngineersandConsensusBuildingInstitute2012).Theserightsarebasedonfourprinciples:(1)intent,whichtypicallyconsistsoftheapplicationforapermit;(2)diversion,whichdefinesthephysicallocation;(3)beneficialuse,whichdefinestheintendedpurposeofawaterallocation(e.g.agriculture);and(4)priority,whichisthedateofthefirstwithdrawalmadeundertheright,witholderrightshavingpriorityovernewerrights.Akeyelementoftheprior‐appropriationdoctrineistheconceptofabandonmentorforfeiture,whichiswhenallorafractionofanallocationiseithernotusedaccordingtoabeneficialuse,orisnotusedatall.Thismeansthatifrightsownersarefoundtouselessthantheyhaveanallocationfor,theymayloseaportionoftheirallocationpermanently.Thissystem,pairedwithdatedreportinglaws,incentivizesrightsholderstoobscure,ornotevenreport,theirwateruse,asfulldisclosurecouldjeopardizeanowner’sallocation.
WhilewaterAMIisapowerfultechnologyformanagingwaterconsumption,manyrightsholdersarehesitanttoparticipateinutilityprograms(e.g.demandresponse)thatwoulddisclosethedetailsoftheirwaterconsumptiontopublicutilitiesorthreatenprofits(DinarandMody2003).Asaresultoftheselegalandregulatoryfactors,farmsthatembraceadvancedresourcemanagementstrategies,includingnetworkedadvancedwatermeteringsystems,typicallyinstallindependentandinternalsystemsthatdonotsharewaterdatawithwaterdistrictsorregulatoryagencies.Whiletheseinternaladvancedmeteringsystemscanprovidefarmerswiththesamelevelofinformationconcerningtheirwaterconsumption(alongwithsoilmoisture,temperature,weatherpatterns,etc.),theselocalinstallationslackthetwo‐waycommunicationbetweengrowersandtheutilityorirrigationdistrictthatiscommoninafullAMIsystem.Thetwo‐waycommunicationanddata‐sharingattributesofAMIenablemoreaccuratewaterusetrackingandM&Vtosupportjointwater‐energyprogramsandpoliciesintheagriculturalsector.Thisfindingisimportant,andshouldbeconsideredwhensettingpoliciesanddevelopingprogramstoensurewaterrightsholdersarenotdeterredfromparticipationbyrisktotheirwaterrightsandallocations.
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3.3 Utility Coordination and Conflicting Priorities
ToachievethemostenergybenefitswithexistingandfuturewaterAMIsystems,waterandenergyutilitieswouldneedtocollaborateonindividualprojectsandstrategicplanning.However,inourdiscussionswithexperts,theycommunicatedthatcoordinationacrosswaterandenergyentitiestoimplementjointwater‐energyprogramsisaverycomplextask.Anumberofelementsarecrucialtothesuccessofaproject,including:(1)determiningappropriateallocationofresourcesbetweenthetwoentities;(2)parallelprojectgoalsthatencouragecooperation;(3)streamlinedcommunications,legalreview,andinter‐agencyprocedures;and(4)standardizationofAMIdata.Expertsalsoindicatedthat,evenwithinmunicipalutilitiesthatprovidebothenergyandwaterservices,cross‐departmentcollaborationandcoordinationcanbedifficultandisrelativelyuncommon.
A2013surveybyCooleyetal.foundthat30%ofenergyandwaterexpertssurveyeddescribedtheinabilitytosharecustomerdataduetoprivacyconcernsasasignificantbarriertothesuccessofwater‐energyprograms.Thisinabilitytosharedataisoftenduetolegalandbureaucratichurdlesthatcanpreventthesuccessoftheproject,butcanalsobecausedbythefactthatutilitiesusedifferentsoftwareanddatamanagementarchitectures.SomeoftheseissuescouldbesolvedwithmorewidespreadstandardizationofAMIdata.
Figure4:Left,California’sInvestorOwnedUtilities’serviceterritories(CEC).Right,locationandsizeofCalifornia’sregulatedwaterutilities(CaliforniaWaterAssociation).
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Itisalsocommonforsignificantmismatchestoexistbetweentheserviceterritoriesofenergyandwaterutilities.Forexample,Figure4showshowitisnotuncommonforCalifornia’senergyutilities’serviceterritoriestooverlapwithdozensofwaterutilities.Thismismatchbetweenwaterandenergyutilities’serviceterritories,aswellastherelativenumberofwaterutilitieswithinasingleenergyutility’sserviceterritory,hasbeencitedasaslight‐to‐moderatebarriertoimprovedwater‐energyprogramcoordination(CooleyandDonnelly2013).
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Case Study: California
4.1 Background
ThestateofCaliforniaisaleaderinthecollectionofenergyusedata,withover12millionsmartmetersinstalledacrossthestate(IEI2014).However,thedeploymentofadvancedwatermetersandwaterAMIintegrationinCalifornialagsbehindthatofenergyAMI,mainlyduetooperationalneedsthatonlyenergyutilitiesface,suchastheneedtoaccuratelymeterdistributedenergyresourcesandtheneedtoenableTOU‐basedelectricityprices.In2004,California’sLegislaturepassedAssemblyBill(AB)2572,whichrequiresallmunicipalwaterconnectionstobemeteredandcapableofenablingvolumetricbillingforcustomersby2025(CaliforniaStateAssembly2004).Ineffect,theresolutionwillincreasethemeteringofwaterusestatewide.Althoughthisisapromisingstep,theresolutiondoesnotmandatetheperformancerequirementsofthemeteringorcommunicationsinfrastructure.ThismeansthedeploymentofadvancedwatermetersandAMIisdependentonutilityinvestmentcapabilities,incentives,andpriorities.Additionally,CaliforniarecentlypassedSenateBill555,which:(1)requiresurbanretailwatersupplierstocompleteandsubmitawaterlossauditreportannuallybeginninginlate2017;and(2)dictatesthattheStateLegislaturetoadoptrulesregardingthestandardizationoftheseauditsbyJanuary1,2017(CaliforniaStateSenate2015).ItremainsunclearexactlyhowtheseBillswillimpactthestateofadvancedwatermeteringinCalifornia.However,Californiaisoneofthefewstatesthathasinvestigatedandtakenstepstobetterquantifytheembeddedenergyofwaterconsumptionandtheenergydemandsofthewatersystemasawhole.
4.2 Embedded Energy of Water in California
Howweathervariationandlong‐termclimatechangeimpactthewater‐relatedenergyneedsofthemunicipal,industrial,andagriculturalsectorsarenotwellunderstood,thoughthereareassumedtobesignificantdifferencesasCalifornia’ssurfacewateravailabilitydecreases,groundwaterdepthsincrease,andseveredroughtcontinuestoimpactthestate.TodeterminethescaleoftheopportunitiesforimprovingresourceuseinCalifornia,theCEC,Maupinetal.,andtheCaliforniaDepartmentofWaterResources(CDWR)performedassessmentsofwaterandwater‐relatedenergyuseinCalifornia.Theagricultural,industrial,andmunicipalsectors’estimatedannualwaterconsumptionandwater‐relatedenergyconsumptionareshowninTable4.ItisimportanttonotethatthevaluesinTable4arenotforidenticalcalendaryears,however;thoughthesestudiesrepresentsomeofthemostcomprehensiveassessmentscurrentlyavailableforCalifornia,datacollectioninthisfieldisinfrequentanduncoordinated,whichhasposedanotheranalyticalchallenge.
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Table4showsthattheagriculturalsectoristhelargestconsumerofwater,accountingfor75%ofallwaterconsumedinthestate;municipaluseaccountsforapproximately24%,andindustrytheremaining1%.Table4alsoshowsthatthemunicipalsectorusesthemostwater‐relatedenergy,at64%,agricultureusesanadditional22%,andindustrialusestheremaining14%.ThelastcolumninTable4isanestimateofeachsector’senergyintensityofwater,orembeddedenergy,calculatedfromthetwoothercolumnsaccordingtoEquation2.Thiscalculation,shownintheWater‐RelatedEnergycolumn,isconsistentwiththisreport’sdefinitionofembeddedenergy,whichdoesnotincludeend‐useassociatedenergy.
Equation2
Table4:WaterandEnergyConsumptionbySectorinCalifornia
Sector
Water‐RelatedEnergyConsumption
(GWh/year)
WaterConsumption
(BG/year)
EmbeddedEnergyofWater(kWh/MG)
Agriculture 10,5601 8,5002 1240
Industry ~68001 1603 42,500
Municipal ~30,6001 2,7003 11,300
1(CEC2005);2(Maupinetal.2014);3(CDWR2013);Shadingindicatesmagnitudeofvalue,darker=larger.
Despiteusingtheleastwaterandwater‐relatedenergyofthesectors,theindustrialsectorhasthehighestembeddedenergy,at42,500kWh/MG.Thisresultisnotsurprising,asindustrialprocessesoftenpressurize,heat,and/ortreatwater,allofwhichareenergyintensive.Additionally,industriesthatreusewaterwillhavedrasticallylargerenergyintensities,asthesamevolumeofwatermaybeputthroughaprocessmultipletimes.Municipalwateruseisthenextmostenergyintensive,at11,300kWh/MG.Agriculturalwateruseistheleastenergyintensive,atapproximately1240kWh/MG,howeverthesevaluescanbehighlyvariableastheenergyuseisattributabletomanyfactorssuchasgeographiclocation,climate,andwatersource.Forexample,intheir2003report,Burtetal.indicatethattheembeddedenergyofagriculturalwaterinthecoastalregionsofthestateisapproximatelyfourtimesthatofwaterintheCentralValley,owinginparttotheenergycostofconveyingwatertothecoast.
Forcomparison,Table5showsbottom‐upestimatesoftheenergyintensityrangesforanumberofsegmentsofthewatercycle.Watertreatmenthasthelargestrangeofenergy
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intensity,withthelowendrepresentingagriculturalorindustrialwaterthatdoesnotneedtobepotableandthehighendrepresentingdesalinatedwatertreatment.Watersupplyandconveyancehavethesecondlargestrangeofenergyintensity,withthelowendrepresentinggravity‐fedsupplysystemsforwhichnopumpingisnecessaryandthehighendrepresentinglargeinter‐basintransferprojectssuchastheStateWaterProject(SWP).
Table5:RangeofEnergyIntensitiesWaterUseCycleSegment(CEC2005)
Water‐UseCycleSegments
RangeofEnergyIntensity(kWh/MG)
Low High
WaterSupplyandConveyance 0 14,000
WaterTreatment 100 16,000
WaterDistribution 700 1,200
WastewaterCollectionandTreatment 1,100 4,600
WastewaterDischarge 0 400
RecycledWaterTreatmentandDistribution
400 1,200
Theonemajorwater‐usecyclesegmentnotincludedinTable5istheend‐useitself.Forexample,theenergyintensityofheatingwaterforresidentialclotheswashingorpressurizingindustrialwaterisnotincludedinTable5.Theseend‐use‐relatedenergyintensityfactorscanbeasignificantfractionoftheoverallenergyintensityofwater,especiallyintheindustrialsector.
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Figure5:EnergyintensityrangebycomponentforCalifornia’sthreeIOUs(GEIConsultantsandNavigantConsulting2010).
Figure5,reproducedfromthe2010report,“EmbeddedEnergyinWaterStudiesStudy2:WaterAgencyandFunctionComponentStudyandEmbeddedEnergy‐WaterLoadProfiles”,showstherangesinenergyintensityofvariouscomponentsofthewatercycleforCalifornia’sthreeInvestorOwnedUtilities(IOUs).Whilethesevaluesarenotfromarepresentativestatisticalsample,theyareusefulforscopingandunderstandingvariabilityandembeddedenergysavingsopportunities.
ThevaluesfromTable4,Table5,andFigure5willbeusedtoscopethepossibleenergyimpactsofAMIacrossCalifornia.
4.3 Potential for Energy Efficiency
TheinformationandcontrolsprovidedbyAMItocustomersandutilitiescanhavelargeenergyefficiencyimpacts.Suchopportunitiesincludemoreefficientsystemoperational
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strategies,energysavingsthroughwaterconservationandleakdetection,andchangesinconsumerbehavior.ThefollowingsubsectionsdiscussthescaleoftheseopportunitiesinthemunicipalandagriculturalsectorsinCalifornia.
4.3.1 The Municipal Sector
DeOreoetal.foundthatcustomer‐sideleakswaste31gallonsofwaterperhouseholdperdayinCaliforniaresidences,whichisapproximately17%ofallindoorconsumption(2011).AnEBMUDpilotstudythatinstalledAMIandutilizedanonlinecustomerportalwherecustomerscouldexaminetheirhourlywateruseobservedsubsequentwaterconservationbetween5%and50%,withanoverallaverageofapproximately15%afterinstallation(EBMUD2014).Giventhat2.9trilliongallonsofwaterareconsumedintheurbansectorannuallyinCalifornia(CDWR2013),andassumingaconservative10%savingsfrombehavioralandcustomer‐sideleakfixes,implementingwaterAMIstatewidecouldreducestatewidewaterconsumptionby290billiongallonsannually.UsingtheembeddedenergyestimatesfromTable4,thesewatersavingscouldresultinapproximately3.3TWhofembeddedenergysavings1throughconsumerbehaviorchangeandcustomer‐sideofthemeterleakfixesalone.
Regardingutility‐sideleaks,areportpreparedforSouthernCaliforniaEdisoncalculatedthatthephysicallossesinCalifornia’swaterdistributioninfrastructureaccountforapproximately11%oftheurbanwaterconsumedinthestate(WaterSystemsOptimization2009).Theauthorsfurtherestimatedthat40%oftheselossesarerecoverableeconomically,assumingthelostwaterisvaluedatretailprices,whilenotingthatvaluetobe“reasonableandratherconservative.”Thisassumptionisbasedonthestandardpracticeof“reactivemanagement,”whichmeansfixingleakswhentheyarereportedtotheutilitybycustomersorthegeneralpublic.IfAMItechnologiescouldreducethecostofrecoveringtheselossesthroughrapid,automatedleakidentificationandpreemptivepipereplacement(replacingwatermainsbeforetheyburst),wesuggest75%ofthesereallossesmaybeeconomicallyrecoverable.Thiswouldimply8%ofurbanwaterconsumedinthestate,equivalentto230BG/year,couldbeconservedwithAMI.UsingtheestimatesofembeddedenergyfromTable4,thesewatersavingscouldresultinapproximately2.6TWhofembeddedenergysavings2throughavoidedproduction,treatment,anddistributionofwater.
13.3TWhwascalculatedbymultiplying290BG/yearbythemunicipalembeddedenergyvalue,11,300kWh/MG,foundinTable4.22.6TWhwascalculatedbymultiplying230BG/yearbythemunicipalembeddedenergyvalue,11,300kWh/MG,foundinTable4.
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Together,utility‐sideandcustomer‐sideleakrepaircouldhavesignificantenergy‐savingpotentialinthemunicipalsector.Theimportantoutstandingquestionishow,ifatall,waterutilitiescancapturethevalueoftheseenergysavingsasanaddedincentiveforupgradingandinstallingwaterAMIsystems.TheCPUC’snewWaterEnergyCostEffectivenessCalculatoraimstogiveutilitiespropercreditforenergysavingsattributabletowaterefficiencyprograms(CPUC2016),howeverweareunawareofademonstratedprojectwherebehavioralorAMI‐drivenwatersavingsweregivencreditforembeddedenergysavings.
4.3.2 The Agricultural Sector
Arecentstudyreportsthatmorethan10TWhofelectricityisconsumedannuallyforpumpingagriculturalirrigationwaterinCalifornia(Marksetal.2013).Researchershavefoundthatimproveddatacollectionofbothwaterandenergyuseonfarmsiscrucialtoimprovingirrigationenergyefficiency,especiallywhenintegratedwithon‐farmenergymanagementsystems(Rocamoraetal.2013).Acasestudyofapressurizedirrigationpumpingsystemfoundthatbasicelectricalandhydraulicmeasurementsatthepumpingstationcouldachievemoreoptimalpumpoperation,resultinginenergysavingsofupto14%(Morenoetal.2007).Applyingaconservativeestimateofa10%energyefficiencysavingsfromimplementationofon‐farmAMIandimprovedcontrolstrategiesforthe10TWhofwater‐relatedenergyuse,theagriculturalsectorcouldcertainlyrealize1TWhofsavingsannually.
On‐farmleakswastebothwaterandenergy,butcanalsopresentathreattocrophealth,asundetectedleakscansaturateandkillwater‐sensitivecrops.Whiletherearesomecompanies(e.g.PowWowEnergy)marketingleakdetectionalgorithmstotheagriculturalsector,thereisnodataorwell‐supportedestimatesavailableforthemagnitudeofon‐farmleaks.California’sSustainableGroundwaterManagementAct,whichcameintoeffectin2016,giveswateragenciesthemandatetodevelopsustainablewatermanagementstrategies,includingenhanceddatacollectionongroundwaterwithdrawalsandwaterlossesduetoleaks(StateofCalifornia).Whileitisstillunclearhowmostagencieswillchoosetodevelopandimplementtheirplans,werecommendtheyexplorethepotentialofAMIsystemstoaddresssustainablewater‐energymanagementatboththecustomer‐andagency‐level.
4.4 Potential for Peak Load Reduction
Peakelectricloadhoursaretypicallyinwarmsummermonthsandoccurduringthemidtolateafternoon.Thesepeakdemandhoursrequireelectricutilitycompaniestoprocureexpensivegenerationportfolioscapableofsupplyingpowerduringthesehours.Demandresponseandpermanentloadshiftingaretwosolutionstothisissue.TheCaliforniaEnergy
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Commissionhasfundedanumberofstudiesexaminingthepeakelectricitydemandimpactsofwater.Intheseminal2005report,California’sWater–EnergyRelationship,theCECestimatedthatpeakelectricaldemandcouldbereducedbyapproximately250MWif“wateragenciesstatewideviewedtheir[water]storageasanenergyassetaswellasawaterasset.”Forcontext,asof2014,therewasapproximately2000MWofDRinCalifornia(Jarred2014).Additionally,itwasestimatedthatCalifornia’swater‐supplyrelateddemandexceeds2000MW(House2007).WesuggestthatfurtherpeakloadreductionsandloadshiftingthroughDRcouldbeenabledbymorewidespreadAMIandimprovedco‐optimizedwater‐energymodeling.Wediscussthispotentialforthemunicipalandagriculturalsectorsinthefollowingsubsections.
4.4.1 The Municipal Sector
Ina2007follow‐onstudytotheCEC’sCalifornia’sWater–EnergyRelationshipreport,Houseetal.foundthat500MWofwateragencyelectricaldemandisusedtoprovidewaterandsewerservicestoresidentialwatercustomersthroughoutCalifornia.Thisestimatedoesnotincludethedemandneededtosupplywatertootherurbancustomers,includingcommercialandindustrialcustomers.Thesefindingsshowthatasignificantamountofpeakloadispresentthat,withproperinfrastructureinvestment(e.g.waterstorageandAMI)andimprovedoperations,couldbepartiallyshiftedtooff‐peakhours.
Unfortunately,thereisverylittlequantitativeinformationaboutthespecificoperationalchangesthatAMIenablesinthemunicipalsector.Inourinterviewswiththem,expertsindicatedthatthedataprovidedbyAMIwouldenablemoreflexibleandreliableoperationofwatersystems.Additionally,waterAMIsystemsthatmeasurehourlycustomerconsumptionwouldallowwaterutilitiestouseTOUwaterpricingtariffstoencourageoff‐peakwaterconsumption.
4.4.2 The Agricultural Sector
Ina2007reportfortheCEC,Houseetal.estimatedthatroughly60%ofthestate’swater‐relatedpeakelectricaldemandisattributabletopumpingagriculturalirrigationwater.Furtherresearchhasexaminedtheshapeofagriculturalloadprofilesoverbothdailyandseasonaltimescales.FromarecentreportbyOlsenetal.,Figure6showsthedailyaveragedemandprofileforapproximately35,000agriculturalcustomersfromPacificGasandElectric’sserviceterritoryfortheyears2003‐2012.Itshowsthatthepercentofenergyusedduringpeakhours(between12and6PM),increasedfrom2003until2006,whenpeakdemandwas120%oftheannualaverage,andhassincedecreased,withpeakdemandatapproximately105%ofannualaveragedemandin2012.Thisshowsthat,whilethecurrenttrendismovingtowardsreducingtheintra‐dayvariationinhourlyload,thereisstillalargeamountofirrigationoccurringduringpeakhours.
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Californiacurrentlyhasapproximately65MWofagriculturalpeak‐sheddingDRcapabilities,whichrepresentsapproximately6.5%ofthe1GWofestimatedloadshedpotentialinthestate(Olsenetal.2015).ThisDRismostlymanuallyoperated,andiseligiblefortheenergymarketand,moreimportantly,capacitycredit,whichiscurrentlytheprinciplevaluestreamforpeak‐shavingDR.ArecentinterimreportfromLBNL’s2015CaliforniaDemandResponsePotentialStudyfound68MWofagriculturalpeak‐sheddingDRcapabilitiestobecosteffectiveby2025(Alstoneetal.2016).However,thisinitialstudydidnotexplorechangestotheunderlyingtechnologystrategiesemployedintheagriculturalsector,andreliedonpastcustomerenrollmentratestoestimatethefractionofgrowersparticipatinginDR,whichmightbesignificantlyimpactedbyarolloutofadvancedwatermeteringsystems.
Figure6:Averagedailydemandprofilesforapproximately35,000agriculturalcustomers’intervalmetersfromPG&E’sserviceterritory,2003‐2012.Figureshowshowdailyagriculturalloadprofileshaveflattenedsince2006,butstillpeakduringmid‐dayhours.ReproducedfromOlsenetal.(2015).
AnadditionalareaofinterestforfutureresearchanddemonstrationprojectsisthatofagriculturalloadsprovidingAS,whichincludegridproductssuchasfrequencyregulationandcontingencyreserves.California’sambitiousRenewablesPortfolioStandardmandatesthat33%oftheelectricityusedinthestatecomefromrenewableenergysourcesby2020.Asrenewablesaremoredifficulttoforecast,havehighvariability,andcannotbecontrolled
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inthesamewayastraditionalgenerators,itispredictedthatthedemandforASwillgrowwithhigherrenewablepenetration.Figure6suggeststhat,sinceagriculturalloadsarepresentatalltimesofday,theycouldbeavailabletomeetASneedsatthemostopportunetimesofday,suchasduringmulti‐houreveningramps.WerecommendfurtherscopinganalysisforthispotentialopportunitytomeetthefuturegridneedsinCalifornia,aswellasotherstatesandcountrieswithambitiousrenewableenergygoalsandsizeableagriculturalsectors.Asco‐authorsontheAlstoneetal.DemandResponsePotentialStudy,weareawareofongoingworkthatwillexploreandquantifythevalueofagriculturalDRresourcestoASmarketsand,moregenerally,gridoperationsinCalifornia.
4.5 Summary
Table6summarizesthewaterandenergyimpactpotentialforanumberofhigh‐levelanalysesdiscussedearlierinSection4.Wedonotbelievethistobeanexhaustivelistoftheopportunitiesforadvancedwatermeteringtohaveassociatedenergybenefits,howeverinmanycasesdatadoesnotexisttomakeevenhigh‐levelestimatesofpotential.Werecognizethatotheropportunitiesexist,including:
EnablingincreasedDRparticipationfrommunicipalwaterutilitiesandagriculturalcustomersthroughimprovedwaterforecastingandmanagementandreducedrisk.
Leakdetectionandrepairintheagriculturalsector.
Improvedpressuremonitoringandmanagementinmunicipalwatersystems.
Table6:Summaryofestimatedwaterandenergyimpactpotentialforvariouswater‐relatedadvancedmeteringstrategiesinCalifornia.
AdvancedMeteringStrategyWaterSavingsPotential
EnergyImpactPotential
WaterAMIforMunicipalCustomer‐sideLeakDetection
290BG/year3.3TWhofembeddedenergysavings
WaterAMIforMunicipalUtility‐sideLeakDetection
230BG/year2.6TWhofembeddedenergysavings
On‐FarmWater‐EnergyMeteringforPumpOperationOptimization
N/A1TWhofenergyefficiencysavings
Energy‐CentricOperationofExistingWaterStorage
N/A 250MWofpeakDR
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Concluding Remarks
Thisreportisafirstattemptatcompilinganddocumentingthevariousopportunitiesforadvancedwatermeteringtechnologies,includingAMI,toprovideenergybenefits.Themarketforsuchtechnologiesisexpanding,andthesensingandnetworkcommunicationstechnologiesareimproving.OurbroadfindinginreviewingtheenergylandscapeforwaterAMIisthatthesetechnologicaladvancesarelargelyvaluedforpurposesofimprovedwatermanagementorconservation.Apartfromelectricitydemandresponseprograms,wefoundverylittlediscussionorconsiderationofthedirectbenefitstotheenergysectorfromwaterAMI.ThisisanimportantgapinmeasuringthebenefitsofwaterAMI,asanemergingtechnology,tomeettheelectricalneedsforpresentandfuturegridneeds.
Throughareviewoftheopenliteratureandinterviewswithnineexpertsfromthewaterandenergysectors,wedocumenthowdataprovidedbyadvancedwatermeteringsystemshasthepotentialtorealizeenergyefficienciesandprovideenergyservicestothegrid.Currently,stakeholdersconsistentlyagreethatthedearthofwaterandwater‐relatedenergy‐usedatahinderseffortsinthewater‐energynexus,andthatwaterAMIsystemscouldhavefar‐reachingco‐benefitswiththeenergysector,policy,programdesign,customereducation,andoverallresourceefficiency.
Thetwosectorsofmostinteresttouswerethemunicipalandagriculturalsectors.Inthemunicipalsector,opportunitiesincludemorerapidandaccurateleakdetectiononbothsidesofthemeter,improvedinfrastructuredesign,andmoreefficientsystemoperation.Intheagriculturalsector,opportunitiesincludeimprovedwaterandenergyefficientirrigation,cropriskquantification,andahighlyflexibledemandresponseresourceforbothpeakloadsheddingandancillaryservices.Wealsodiscusshowadvancedwatermeteringmayhelpovercomebarrierstoimprovedwater‐energypolicy,jointwater‐energyutilityprogramdesign,andmoreefficientresourceusebyconsumers.
Alimitationofthisreportisthelackofavailableinformationforquantifyingtherealizedenergyandenergy‐relatedmonetarybenefitsofwaterAMI.Asaresult,thefindingsdiscussedinthereportareoftenanecdotalowingtotheabsenceofthisinformation.Acontinuationofthisworkistoquantify,analyze,andprioritizethepotentialbenefitsofwaterAMIinindividualsectorsthroughdeeper,data‐drivenstudies.
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Future Work
Throughourreviewoftheopenliteratureandinterviewswithwater‐energyexperts,weconfirmedthatthereisverylittledataabouttheinterconnectionofwaterandenergysystems.Thislackofdatamakesassessingtheenergybenefitsofadvancedwatermeteringdifficult,andthereforeimpairstheirprioritizationcomparedtootheremergingenergytechnologies.ThisreportdocumentstheanecdotalevidencethatwaterAMIhasthepotentialtoaddressfuturegridneedsandimprovetheenergyefficiencyofthewatersystem.However,theanecdotalevidence,andlimitedquantitativeinformation,isinsufficienttodevelopactionablepolicies,technologyadoptiongoals,incentiveprograms,orgridintegrationstrategies.Werecommendandsupportfurtherdatagatheringefforts.Asfollow‐onworktothisscopingstudy,weseetheneedfordatagatheringanddeeperanalysisoftheopportunitiespresentedinthisreport.Inadditiontodatagatheringefforts,futureresearchinthisareashouldfocusonthefollowingkeyissues:
WhataretheperformancerequirementsofwaterAMItomeetspecificgridneeds?Forexample,describethetechnologiesandinfrastructurerequirementsnecessarytosupportautomatedDRforancillaryservicesintheagriculturalsector.
WhatdataandassociatedanalyticaltechniquesarenecessarytoconfirmandanalyzethebenefitsofwaterAMIprojects?Themeasurementandverificationofbenefitsiscrucialforutilities,theDOE,andotherstojustifysupportinginvestmentsinthem.
WhatcharacteristicsofwaterAMIsystemsarecrucialtorealizingtheenergy
benefitsidentifiedinthisreport?Forexample:o Howimportantiswaterflowmeterprecision,andwhatlevelofprecisionis
sufficienttostillbecost‐effective?o Whatsensors,analytics,andcontrolsarenecessarytosufficientlyquantify
andforecastcroprisksthatcouldattractgreaterfarmerparticipationin
ADR?
AcostsurveyofwaterAMIprojectsdetailingthecostsandcapabilitiesofAMI
systemsaswellasexploringhowcostsscalewithutilityserviceterritoryand/or
numberofcustomers,andhowtheydifferacrosssectors.
Casestudiesofcurrentandpastadvancedmeteringprojectsthatidentifyvalue
pathwaysforwatermeterdatatorealizeenergybenefitsandhavemadeeffortstomonetizethem.
WhatregulatoryopportunitiesexistforpolicymakerstoencouragewaterAMI,
especiallytorealizeenergybenefits?
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WhatarethebestpracticesforimplementingandoperatingwaterAMIsystems,and
howdotheydifferifenergyservices(suchasDR)areincorporated?
Theabovemattersareperhapsbestexploredthroughcasestudiesacrossdifferentregionsandsectors,inordertodeveloporder‐of‐magnitudeestimatesofmarketbenefits.
Wealsosuggestthedevelopmentanddesignofapublicly‐availabletoolforpolicymakers,utilities,businesses,homeowners,andresearcherstoestimatetheembeddedenergyintheirwaterbasedonparameters,includingbutnotlimitedto,enduse,location,timeofday,season,andelevation.TheCaliforniaPublicUtilitiesCommissionrecentlyproducedaversionofsuchatoolforCalifornia,withthegoalofincreasingvaluecaptureforwaterandenergyutilities,aswellasincentivizingprogramcooperation(CPUC2016).SuchatoolwouldbeusefulforotherregionsoftheU.S.,particularlythosethatfacewaterscarcityandwatervaluationchallenges.Avaluabledatagatheringandanalysistaskthatremainsisanationwidestudyoftheembeddedenergyofwateracrosstheagriculturalandurbansectors.Nationalleveldatabasessuchasthiswouldbepowerfulassetsforimprovingregionalresourcemanagementandfurtheringresearchinthewater‐energynexus.
Finally,demonstrationprojectsfocusedonthefeasibilityandcostofintegratingwaterAMIsystemsexplicitlyforenergybenefitsareneeded.ThesecouldincludeprojectstodemonstratehowwaterAMIdataenableselectricDRparticipation,howin‐homedisplayscanbebestimplementedtorealizejointwater‐energybenefits,orwhatthecost‐optimaldistributionofflowmeters,aswellaslevelofprecision,isfordetectingbefore‐the‐meterleaks.
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