June 26, 2007 2-1 PCWA - Middle Fork Project Project Operations 6-26-2007.

June 26, 2007June 26, 2007 2-2-11

PCWA - Middle Fork Project PCWA - Middle Fork Project

Project OperationsProject Operations

6-26-20076-26-2007

June26, 2007June26, 2007 2-2-22

Presentation AgendaPresentation Agenda

Review PCWA Interests and Review PCWA Interests and Operating ObjectivesOperating Objectives

Overview OperationsOverview Operations Describe Key Characteristics of Describe Key Characteristics of

MFP OperationsMFP Operations

June26, 2007June26, 2007 2-2-33

InterestsInterests

Water SupplyWater Supply Energy GenerationEnergy Generation Protection of environmental, Protection of environmental,

recreational and cultural recreational and cultural resourcesresources

June26, 2007June26, 2007 2-2-44

Operating ObjectivesOperating Objectives

Comply with FERC license Comply with FERC license conditions conditions

Serve water demands in Placer Serve water demands in Placer CountyCounty

Generate power during peak Generate power during peak energy demand periodenergy demand period

Maintain project facilitiesMaintain project facilities

June26, 2007June26, 2007 2-2-55

MFP OperationsMFP Operations

June26, 2007June26, 2007 2-2-66

Contact PCWA forContact PCWA forNon-Internet Public Figure Non-Internet Public Figure

5-15-1Principle Project FacilitiesPrinciple Project Facilities

June26, 2007June26, 2007 2-2-77

Hydrology / Diversion Rights•Permits•Water available for use

Water Uses•Stream Maintenance Flow•Consumptive Use•Generation

MFP Facilities – Physical Capacities•Reservoir Storage•Diversion, tunnel and powerhouse flows

Annual Operations

Cycle• Reservoir Fill Period

• Reservoir Release Period

- stream maintenance

- delivery for water use

- peaking generation

- recreation flows

• Maintenance Period

Annual Operations CycleAnnual Operations Cycle

June26, 2007June26, 2007 2-2-88

Annual MFP InflowAnnual MFP Inflow

0

100000

200000

300000

400000

500000

600000

700000

800000

900000

Infl

ow

(A

F)

Hell Hole French Meadows Duncan Creek NF Long Canyon SF Long Canyon

June26, 2007June26, 2007 2-2-99

Reservoir RefillReservoir Refill French Meadows Reservoir

5140

5160

5180

5200

5220

5240

5260

5280

1-O

ct

15-O

ct

29-O

ct

12-N

ov

26-N

ov

10-D

ec

24-D

ec

7-Ja

n

21-J

an

4-F

eb

18-F

eb

4-M

ar

18-M

ar

1-A

pr

15-A

pr

29-A

pr

13-M

ay

27-M

ay

10-J

un

24-J

un

8-Ju

l

22-J

ul

5-A

ug

19-A

ug

2-S

ep

16-S

ep

30-S

ep

Ele

vati

on

(ft

)

1989 1983 2001

Average Year

Wet Year

Dry Year

June26, 2007June26, 2007 2-2-1010

Combined Reservoir StorageCombined Reservoir Storage

50,000

100,000

150,000

200,000

250,000

300,000

350,000

1/1

/67

1/1

/69

1/1

/71

1/1

/73

1/1

/75

1/1

/77

1/1

/79

1/1

/81

1/1

/83

1/1

/85

1/1

/87

1/1

/89

1/1

/91

1/1

/93

1/1

/95

1/1

/97

1/1

/99

1/1

/01

1/1

/03

1/1

/05

Date

Sto

ra

ge

Vo

lum

e,

AF

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

June26, 2007June26, 2007 2-2-1111

Water Supply Water Supply Delivery Obligations to:Delivery Obligations to:

PCWA - Zone 1PCWA - Zone 1 San Juan Water DistrictSan Juan Water District City of RosevilleCity of Roseville Sacramento Suburban Water DistrictSacramento Suburban Water District

Diversion points for delivery at Diversion points for delivery at American River Pump Station American River Pump Station (Auburn) and Folsom Reservoir(Auburn) and Folsom Reservoir

Limited to 120,000 acre-feet yearLimited to 120,000 acre-feet year

June26, 2007June26, 2007 2-2-1212

Seasonal Consumptive Seasonal Consumptive Demand PatternDemand Pattern

01,0002,0003,0004,0005,0006,0007,000

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecMonth

.

Deliveries, AF

June26, 2007June26, 2007 2-2-1313

Releases for GenerationReleases for Generation

May occur all year May occur all year Seasonal demand pattern Seasonal demand pattern Water released to meet water supply Water released to meet water supply

needs passes through the needs passes through the powerhouses contributing to powerhouses contributing to generationgeneration

June26, 2007June26, 2007 2-2-1414

Total Annual Generation Total Annual Generation Flows Flows (Middle Fork Powerhouse)(Middle Fork Powerhouse)

0

100,000

200,000

300,000

400,000

500,000

600,000

700,000

1967

1969

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

To

tal A

nn

ual

Flo

w t

hro

ug

h p

ow

erh

ou

se, A

F

June26, 2007June26, 2007 2-2-1515

Seasonal Energy Demand Seasonal Energy Demand Pattern Pattern

6,000

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

1/1/

06

2/1/

06

3/1/

06

4/1/

06

5/1/

06

6/1/

06

7/1/

06

8/1/

06

9/1/

06

10/1

/06

11/1

/06

12/1

/06

Lo

ad in

MW

June26, 2007June26, 2007 2-2-1616

Monthly Releases for Generation - Dry Period Monthly Releases for Generation - Dry Period (1987 – 1992)(1987 – 1992)

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

Jan-87 Jul-87 Jan-88 Jul-88 Jan-89 Jul-89 Jan-90 Jul-90 Jan-91 Jul-91 Jan-92 Jul-92

Month, Year

Res

Sto

rag

e, A

F

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

Ave

rag

e M

on

thly

Rel

ease

s, A

F

Pwr + Minimum Releases Comb Res Storage

Reservoir Releases

Reservoir Storage Volume

June26, 2007June26, 2007 2-2-1717

Monthly Releases for Generation - Wet Monthly Releases for Generation - Wet Period (1995 – 1998)Period (1995 – 1998)

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

Jan-95 Jul-95 Jan-96 Jul-96 Jan-97 Jul-97 Jan-98 Jul-98

Month, Year

Res

Sto

rag

e, A

F

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

Ave

rag

e M

on

thly

Rel

ease

s, A

F

Pwr + Minimum Releases Comb Res Storage

Reservoir Releases

Reservoir Storage Volume

June26, 2007June26, 2007 2-2-1818

Peaking Generation versus Peaking Generation versus Daily Energy DemandDaily Energy Demand

Energyproduction

Energydemand

SunSatFriThuWedTueMon

June26, 2007June26, 2007 2-2-1919

Peaking GenerationPeaking GenerationWet vs. Dry YearWet vs. Dry Year

SunSatFriThuWedTueMon

Wet year

Dry year

June26, 2007June26, 2007 2-2-2020

Recreation FlowsRecreation Flows

Below Oxbow Powerhouse, Project Below Oxbow Powerhouse, Project releases are frequently compatible releases are frequently compatible with commercial rafting needswith commercial rafting needs

Occasionally Project releases may be Occasionally Project releases may be modified to facilitate commercial modified to facilitate commercial rafting and other recreation uses rafting and other recreation uses

June26, 2007June26, 2007 2-2-2121

Annual Testing and Annual Testing and MaintenanceMaintenance

Fall (by Nov. 1) - 5 weeks for Middle Fall (by Nov. 1) - 5 weeks for Middle Fork, Ralston and Oxbow Fork, Ralston and Oxbow PowerhousesPowerhouses Period of lower energy and consumptive Period of lower energy and consumptive

water demandwater demand Favorable weather conditionsFavorable weather conditions Low runoffLow runoff

Spring - 2 weeks for French Meadows Spring - 2 weeks for French Meadows and Hell Hole Powerhouses and Hell Hole Powerhouses

June26, 2007June26, 2007 2-2-2222

Key Operating Key Operating CharacteristicsCharacteristics

June26, 2007June26, 2007 2-2-2323

““Storage Flexibility”Storage Flexibility”

Flexibility to manage storage and Flexibility to manage storage and releaserelease Capture spring runoffCapture spring runoff Release during Summer and FallRelease during Summer and Fall

Limited by minimum storage level Limited by minimum storage level requirementsrequirements

Balance between releases vs. Balance between releases vs. retaining water for dry yearsretaining water for dry years

June26, 2007June26, 2007 2-2-2424

Drawdown during summer to meet Drawdown during summer to meet water supply, energy demand and to water supply, energy demand and to provide storage space for the provide storage space for the following year.following year.

Release water from storage all year to Release water from storage all year to meet consumption demand patternsmeet consumption demand patterns

Drawdown in fall to provide storage Drawdown in fall to provide storage for spring runofffor spring runoff

Higher drawdown during drought to Higher drawdown during drought to meet needsmeet needs

June26, 2007June26, 2007 2-2-2525

““Combined Operation of Middle Combined Operation of Middle Fork and Ralston Fork and Ralston

Powerhouses”Powerhouses” Operated to generate on peakOperated to generate on peak Operated at the same time to avoid Operated at the same time to avoid

spillspill Vary output hourly/daily to meet Vary output hourly/daily to meet

energy needsenergy needs

June26, 2007June26, 2007 2-2-2626

““Operation of Oxbow Operation of Oxbow Powerhouse and Ralston Powerhouse and Ralston

Afterbay”Afterbay”

Operation of Oxbow Powerhouse on Operation of Oxbow Powerhouse on the same schedule minimizes the same schedule minimizes reservoir changes at Ralston reservoir changes at Ralston AfterbayAfterbay

Ralston Afterbay can re-regulate Ralston Afterbay can re-regulate flows below Oxbowflows below Oxbow

June 26, 2007June 26, 2007 2-2-2727

““Schedule seasonal releases Schedule seasonal releases to follow combined pattern of to follow combined pattern of water and energy demand”water and energy demand”

June 26, 2007June 26, 2007 2-2-2828

““Maintenance in the Fall”Maintenance in the Fall”

June26, 2007June26, 2007 2-2-2929

Presentation AgendaPresentation Agenda

Review PCWA Interests and Review PCWA Interests and Operating ObjectivesOperating Objectives

Overview OperationsOverview Operations Describe Key Characteristics of Describe Key Characteristics of

MFP OperationsMFP Operations