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PCWA MAY 16, 2006 HANDOUT #4. Middle Fork Project Project Operations Overview. May 2006. MF Project Facilities. Outline. Major storage is at high elevation in the Project watershed Project reservoirs store winter precipitation and spring runoff for use through the dry summer and fall - PowerPoint PPT Presentation
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May 2006May 2006 11
Middle Fork Project Middle Fork Project
Project Operations Overview Project Operations Overview
May 2006May 2006
PCWAMAY 16, 2006HANDOUT #4
May 2006May 2006 22
MF Project Facilities
May 2006May 2006 33
OutlineOutline
Major storage is at high elevation in the Major storage is at high elevation in the Project watershedProject watershed
Project reservoirs store winter precipitation Project reservoirs store winter precipitation and spring runoff for use through the dry and spring runoff for use through the dry summer and fallsummer and fall
Water released through Project tunnels and Water released through Project tunnels and powerhouses flows downhill to generate powerhouses flows downhill to generate powerpower
Withdrawals from the river to meet PCWA Withdrawals from the river to meet PCWA customer demand are at the bottom customer demand are at the bottom (downstream end) of the Project(downstream end) of the Project
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Upper Diversion & Storage Upper Diversion & Storage Facilities Facilities
Duncan diversion into Duncan diversion into FM Reservoir FM Reservoir
French Meadows French Meadows ReservoirReservoir
Hell Hole ReservoirHell Hole Reservoir Collect and store Collect and store
water, total about 340 water, total about 340 TAFTAF
Pattern of collection & Pattern of collection & filling:filling: Collect in winter & springCollect in winter & spring Release in summer and Release in summer and
fallfall
Duncan Diversion inlet in winter
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MF Project Storage Facilities
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May 2006May 2006 77
French Meadows ReservoirFrench Meadows Reservoir
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Hell Hole ReservoirHell Hole Reservoir
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Reservoir Operations Reservoir Operations Considerations Considerations
Hydrologic variability:Hydrologic variability: Spill AvoidanceSpill Avoidance Current-year minimum releases & consumptive Current-year minimum releases & consumptive
demandsdemands Carry-over to meet following year demandsCarry-over to meet following year demandsB120 May 1 Forecasted Folsom Total Inflow
0
50
100
150
200
250
300
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Infl
ow
(P
erce
nt
of
Ave
rag
e)
Avg. inflow to Folsom
Variability = <30% to >240%
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Typical Reservoir Storage Typical Reservoir Storage CurvesCurves
Targets:- Fill with minimal spill- Carry-over 150TAF total
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Water Flow and Generation PathwayWater Flow and Generation PathwayMiddle Fork ProjectMiddle Fork Project
Duncan Diversion
French Meadows Reservoir
Hell Hole Reservoir
Rubicon River
Middle Fork
MF powerhouse MF powerhouse 850 cfs - 122 850 cfs - 122 MWMW
Ralston powerhouseRalston powerhouse920 cfs - 80 MW920 cfs - 80 MW
Oxbow powerhouseOxbow powerhouse1050 cfs - 6 MW1050 cfs - 6 MW
Middle Fork
Duncan Creek
French Meadows pwrhseFrench Meadows pwrhse400 cfs - 15 MW400 cfs - 15 MW
Interbay Reservoir
Afterbay Reservoir
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Main Power Generation FacilitiesMain Power Generation Facilities
Hell Hole reservoir to Interbay via Hell Hole reservoir to Interbay via Middle Fork powerhouseMiddle Fork powerhouse
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Main Power Generation Main Power Generation FacilitiesFacilities
Interbay to Afterbay via Ralston powerhouseInterbay to Afterbay via Ralston powerhouse Release from Afterbay via Oxbow PowerhouseRelease from Afterbay via Oxbow Powerhouse
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Main generation facilities encompass most of the Main generation facilities encompass most of the vertical elevation of the Projectvertical elevation of the Project
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Secondary Generation facilitiesSecondary Generation facilities French Meadows powerhouse: flows from FM French Meadows powerhouse: flows from FM
to HH reservoirsto HH reservoirs Hell Hole power house – stream maintenance Hell Hole power house – stream maintenance
flows flows Oxbow power house – releases to Middle ForkOxbow power house – releases to Middle Fork
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May 2006May 2006 1818
Main generation facilities encompass most of the Main generation facilities encompass most of the vertical elevation of the Projectvertical elevation of the Project
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Operations - GenerationOperations - Generation
Drivers to generation scheduling:Drivers to generation scheduling:
Water availability – reservoir level and Water availability – reservoir level and downstream demandsdownstream demands
Power grid needs – responsiveness to Power grid needs – responsiveness to load and priceload and price
May 2006May 2006 2020
Water Rights Permits
HydrologyHydrologyPower MarketPower Market
FER
C L
icen
se
Term
s
Ph
ysica
l C
on
strain
ts
Window of Operations
Project Operations – Framework for Project Operations – Framework for OperationsOperations
Variable FactorsVariable Factors
Non-Variable Constraints
Non
-Varia
ble
C
on
strain
tsN
on
-Vari
ab
le
Con
stra
ints
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Typical Generation Dispatch Typical Generation Dispatch to meet Loadto meet Load
Most Responsive Units
Least Responsive Units
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““Peaking” GenerationPeaking” Generation
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Project Operations for PeakingProject Operations for PeakingPrimarily MF & Ralston stationsPrimarily MF & Ralston stations
Middle Fork Project Profile
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Key Elements for Peaking Key Elements for Peaking Operations Operations
Available water in Hell Hole reservoirAvailable water in Hell Hole reservoir Middle Fork and Ralston units operate “as Middle Fork and Ralston units operate “as
one”one” Long tunnels and small Interbay mandate closely Long tunnels and small Interbay mandate closely
coordinated operationscoordinated operations
Afterbay fluctuates for re-regulationAfterbay fluctuates for re-regulation MF & Ralston may only generate 8 ~12 hrs/dayMF & Ralston may only generate 8 ~12 hrs/day Downstream requirements and minimum flows Downstream requirements and minimum flows
are 24 hrs/dayare 24 hrs/day Afterbay fills during peaking generation Afterbay fills during peaking generation
operations, empties when generation off-lineoperations, empties when generation off-line
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Historic Total GenerationHistoric Total Generation
MFP Net Generation
0
200000
400000
600000
800000
1000000
1200000
1400000
1600000
1800000
2000000
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
Net
Gen
erat
ion
(M
WH
rs)
Avg generation ~ 1.1M MWhr/yr
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Project Operations OverviewProject Operations Overview
Questions Questions
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Middle Fork Project Middle Fork Project
Project Operations Overview Project Operations Overview
May 2006May 2006
PCWAMAY 16, 2006HANDOUT #4
