long-term strategies for energy utilities
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Long-term Strategies for Energy Utilities
Long-term Strategies for Energy Utilities
WSWC – WGA Water/Energy WorkshopApril 2, 2013
2
Water/Energy Nexus – Colorado Context Self-supplied Industry
Thermoelectric generation (~ 50%)
Snowmaking Sand/Gravel Other large industry
Source: Colorado Water Conservation Board, Statewide Water Supply Initiative, Denver Water
90%
Agriculture
8%
Municipal
Self-supplied Industry
2004
2%
82%
Agriculture
15%
Municipal
Self-Supplied Industry
2050
3%
Avg. residential electric demand – 9.3 gallons per day, <6% Denver Water daily per capita water use in 2011.
3
Water Supply Strategy
Supply Diversity Direct-flow/Storage Self-supplied/contract supply Native basin/trans-basin Recycled wastewater
Supply Integration/Flexibility Engagement
4
Drought Resilience thru Cooperative Agreements
Municipal Agreements Contract supplies Trades “Unique” arrangements
Agriculture Agreements Interruptible Supply Recharge Credits
5
DENVER
LONGMONT
GREELEY STERLING
South PlatteP
oudre
St. V
rain
Clear C
reek
Northern Water
Denver Water
Contract
Ag
GLENWOOD SPRINGS
Ag
Hydro
Storage
Storage
6
Water Stewardship Plant process improvement and reuse opportunities
Process wastewater for lime scrubbing Process wastewater for bottom ash removal Increased cooling tower cycles
Technology Combined-cycle gas generation Hybrid cooling Recycled wastewater Renewables Demand-side management
7
Water Usage at PSCo Generating StationsAnnual Water Consumption vs. System Generation
0
10,000
20,000
30,000
40,000
50,000
60,000
2005 2006 2007 2008 2009 2010 2011
An
nu
al W
ater
Co
nsu
mp
tio
n (
acre
-fee
t)
0
5
10
15
20
25
30
35
40
Gen
erat
ion
(M
illi
on
MW
h)
Annual Water Use Annual Generation
8
Future Trends and Water Use Impacts
Gas and combined cycle generation Renewables Emission controls Carbon capture
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