1

Texas Association of Clean Water Agencies

November 21, 2008

Energy Performance Contracting at Village Creek WWTP

Sebastian Fichera, City of Fort WorthMadelene Rafalko, City of Fort Worth

Peter Cavagnaro, Johnson Controls, Inc.

2

2

Project Drivers

Energy Performance Contracting

Village Creek WWTP

Points of Discussion

3

Project Drivers

City Wide Effort to Comply with Legislation

SB12 (2007)Extended the SB5 Goal of reducing annual electricity consumption by 5% for 6 more years, from 2007-2012“Cost-Effective” Electricity-Based Energy-Efficiency Measures

State Energy Conservation Office (SECO)Annual Reporting Requirement continues, with 2007 as the new Baseline

4

Project Drivers

Water Department

Long list of projects competing for limited capital

Decreasing operating budget

47% of City’s energy expenditures Water & Wastewater

5

Traditional Municipal Project Delivery

Design– Studies– Design

Bid

Build– Construction by Contractors– Services During Construction by Engineer

Owner holds both contracts

Owner

Contractor Engineer

Energy Performance Contracting

6

Alternate procurement mechanism:

Implement infrastructure improvements that reduce energy consumption, oroperating costs

Financed through municipal lease

Paid with savings

One Point of Responsibility by the Energy Services Company

Energy Performance Contracting

7

City of Fort Worth PC to date

Resource Conservation Program managed through Department of Transportation and Public Works

Over $12-million of Improvements Installed

Over $9-million of Improvements in Construction

Over 100-City Facilities Included in Efforts

Energy Savings Performance Contract• $20-million Contract over 4-phases (2000 - 2010)• $2.4-million Annual Savings Guaranteed (first year)• Net 8.3-year Simple Pay Back

8

Performance Contracting Process

Preliminary Analysis

PresentResults of

PreliminaryAnalysis

DetailedAnalysis

Share Information

Project Development Agreement

ContractApproval Implement Service

March 2007

September 2007

Final Engineering,Equipment

Procurement, & Scheduling

Financial Term DeterminesM&V Period(20-yr.max.)

Target ofMarch 2009

(3rd-Party Review Required by Law)

9

Proof of Concept

City of Baltimore Back River WWTP

10

Baltimore’s UnderusedEnergy Resource

1,044,000 cfd to flares

11

Back River PC Project

Project Scope Digester Gas UtilizationDigester Recirculation Pump ImprovementHVAC Improvements Direct Digital Control/Ventilation OptimizationLighting ImprovementsWater Conservation

$1.8 Million in Annual Energy/Operational Savings $14.1 Million Generation Facility, Energy Conservation and Plant Improvements

12

Project in Commissioning

13

Village Creek WWTP

14

Village Creek WWTP

GRAVITYTHICKENERS

BLENDTANK

FLARES

2

1

3

4

6

5

8

7

9

10

12

11

13

14

15

Digester Gas Production

Digester Gas to Combustion Turbine

1,115 KCFD

Digester Gas to Plant 1 KCFD

Digester Gas to Flares 24 KCFD

Total Gas Produced: 1,141 KCFD

2004 Data

16

Village Creek DG Utilization

Since 1960’s DG powered generation & blowers

2000 - Replaced due to age & emissions

17

Village Creek Power Generation

In FY02, the City’s wastewater plant began utilizing a gas-fired turbine-generator system to provide much of its electricity needs.

2 turbine generators

5.2 MW each

DG, LFG, NG

18

Village Creek Electrical Loads

Average 7 to 8 MW– Aeration Blowers– Primary Effluent Pumps– Other pumping & Odor Control– Facilities

Low 5 to 6 MW– Periods of low flow

Peak 12 to 13 MW– When Trinity River high, plant must pump

treated water out

19

Village Creek Aeration Blowers

5 blowers 25,000 cfm1000 HP each

1 blower50,000 cfm

2000 HP

20

Village Creek WWTP

2 unused 31000 cfm blowers

21

Waste Heat RecoveryIncrease Digester Gas ProductionAeration ImprovementsSCADA UpgradeFacilities Improvements

– HVAC– Lighting– Water Conservation

21

Facility Improvement Measures

22

22

Waste Heat Recovery

Heat Recovery Steam GeneratorsRecover waste heat from combustion turbinesGenerate high pressure steam

Steam Driven BlowersIncrease standby capacity of plant

Supplemental Gas BurnerUse all DG to produce steam available for driving aeration blowers

23

Village Creek WWTP

2 unused 31000 cfm blowers

Existing Waste Heat Recovery Units

24

Proposed Heat Recovery Steam Generator

25

25

Increase Digester Gas Production

Digester ImprovementsClean DigestersRemove existing gas lancesInstall new VLM Mixers

Compatible Food WastePotential Sources Identified & Contacted

Waste Receiving StationTanks for drop off – equipped with mixingTanks and pumps for feeding to digesters

26

N

< 100 FT >

CO

NC

EPTU

AL

LAYO

UT

FOR

VC

WW

TP C

O-D

IGES

TIO

NEN

ERG

Y R

EDU

CTI

ON

PR

OJE

CT

---JC

I083

64

BLEND TANK

NEW ROAD

“BATCH” TANKS

FEED TANK

TANKS & PUMPS INSIDE

CONTAINMENT WALL

FEED LINE TO DIGESTERS

SLOPED TRUCK UNLOADING PAD

WITH CURBS

1213

1114

N

90’ Ø

27

27

Aeration Improvements

Nitrification/DenitrificationAnoxic Reactors

Diffuser UpgradeFine Pore Diffuser System

Automated DO Control ImprovementsMost Open Valve Control TechnologyVariable Flow Control of Aeration Blowers

28

Village Creek Aeration Basins

29

N

< 100 FT >

2 FRP BAFFLES

AB #5 –OPERATING IN ANOXIC MODE

AB #4 – OPERATING IN AERATED MODE

NRCY PUMP & RETURN LINE

CO

NC

EPTU

AL

LAYO

UT

FOR

VC

WW

TP A

NO

XIC

ZO

NES

ENER

GY

RED

UC

TIO

N P

RO

JEC

T ---

JCI0

8364

2 COARSE BUBBLE AIR HEADERS WITH DOUBLE

SPIRAL ROLL

3 Ea: 5 Hp MIXERS, WITH WALKWAYS

AND ACCESS STAIRS

MIXERS OFF –(WALKWAYS NOT

SHOWN)

30

HVAC ImprovementsReplace outdated and inefficient equipmentEquipment OptimizationHVAC Controls Implementation

Lighting ImprovementsReplace or retrofit existing inefficient fixturesLighting Controls

Water Conservationfixtures

30

Facilities Improvements

31

$ 3,335,000

31

$ 2,936,000

$ 637,000

Annual Utility Cost Avoidance

Annual Additional Revenues

Net-Total Annual Cost Avoidance

($ 238,000)Annual O&M Cost Avoidance

Projected Benefits

32

$19.1 million

32

$ 2.7 million

$5.0 million

Aeration Diffuser Upgrade

Digester Gas Improvements

Total Cost

Anticipated Cost

$3.6 millionTurbine Waste Heat Recovery

$0.8 millionAnoxic Zones

$7.0 millionSCADA Improvements

33

Village Creek Development Team

Fort Worth Transportation and Public Works

Fort Worth Water

Village Creek Wastewater Treatment Plant

Johnson Controls, Inc.

Vic Weir Consulting

Freese & Nichols

AECOM

CDM

34

Thank You