Moccasin

Hwy 120-49 junction, Moccasin, CA 95347

Plant Summary Information

Moccasin is ranked #36 out of 207 hydroelectric power plants in California in terms of total annual net electricity generation.

Moccasin is comprised of 2 generators and generated 124.7 GWh during the 3-month period between February 2026 to May 2026.

Plant Name	Moccasin
Utility Name	City & County of San Francisco - (CA)
Location	Tuolumne County, CA
Initial Operation Date	August 1969
Last Update	May 2026
Annual Generation	307.6 GWh
Annual Consumption	1.2 M MMBtu
Ranked #1,997 out of 13,081 Power Plants Nationwide
Ranked #148 out of 1,311 Water Power Plants Nationwide
Ranked #170 out of 1,606 California Power Plants
Ranked #36 out of 207 California Water Power Plants
Fuel Types	Water
Previous Operator	City & County of San Francisco (2013 to 2024) City & County of San Francisco - (CA) (2025 to 2025)

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Summary Information
Plant Name	Moccasin (381)
Plant Address	Hwy 120-49 junction, Moccasin, CA 95347
Utility	City & County of San Francisco - (CA) (16612)
Latitude, Longitude	37.80939, -120.29925
Generation Dates on File	Jan 2001 to May 2026
Initial Operation Date	August 1969
Annual Generation	307.6 GWh
Fuel Types	Water

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	WECC
Balancing Authority	California Independent System Operator (CISO)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Priest Reservoir
Ash Impoundment	No
Transmission / Distribution Owner	City & County of San Francisco (16612) CA
Grid Voltage	115.00 kV / 230.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	INTKEP_2_UNITS-APND
RTO ISO Location Designation For Reporting Wholesale Sales Data	INTKEP_2_UNITS
Nameplate Capacity	51.8 MW
Nameplate Power Factor	0.9
Summer Capacity	51.75 MW
Winter Capacity	51.75 MW
Minimum Load	1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	August 1969
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Other Planned Modifications	No
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	INTKEP_2_UNITS-APND
RTO ISO Location Designation For Reporting Wholesale Sales Data	INTKEP_2_UNITS
Nameplate Capacity	51.8 MW
Nameplate Power Factor	0.9
Summer Capacity	51.75 MW
Winter Capacity	51.75 MW
Minimum Load	1 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	September 1969
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Multiple Fuels	No

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#138	H M Jackson	Sultan, WA	333.6 GWh
#139	Upper Baker	Concrete, WA	332.7 GWh
#140	Chelan	Wenatchee, WA	325.2 GWh
#141	Old Hickory	Hendersonville, TN	324.7 GWh
#142	Bartletts Ferry	Salem, AL	324.1 GWh
#143	Flaming Gorge	Dutch John, UT	323.2 GWh
#144	Cherokee Dam	Rudledge, TN	315.3 GWh
#145	Ozark	Ozark, AR	314.7 GWh
#146	Jordan Dam	Wetumpka, AL	313.8 GWh
#147	Lucky Peak Power Plant Project	Boise, ID	311.2 GWh
#149	Ralston	Foresthill, CA	302.6 GWh
#150	Thermalito	Oroville, CA	302.3 GWh
#151	Logan Martin Dam	Vincent, AL	299.6 GWh
#152	Rainbow (MT)	Great Falls, MT	298.6 GWh
#153	Bliss (ID)	Bliss, ID	297.7 GWh
#154	Comerford	Monroe, NH	296.8 GWh
#155	Wyman Hydro	Bingham, ME	295.2 GWh
#156	Camino	Camino, CA	293.9 GWh
#157	LaGrande	La Grande, WA	291.2 GWh
#158	Walters	Waterville, NC	289.1 GWh

Below are closest 20 power plants surrounding Moccasin.

Plant Name	Plant Location	Annual Generation	Distance
Angels	Angels Camp, CA	5.9 GWh	22.4 mi
Collierville Powerhouse	Murphys, CA	396.3 GWh	23.6 mi
Dion R Holm	Groveland, CA	577.8 GWh	19.1 mi
Don Pedro	La Grange, CA	285.7 GWh	10.2 mi
Exchequer	Snelling, CA	245.8 GWh	15.6 mi
La Grange	La Grange, CA	6.6 GWh	12.5 mi
McSwain	Snelling, CA	26.9 GWh	19.9 mi
Merced Falls	Snelling, CA	9.1 GWh	19.9 mi
Moccasin Low Head Hydro Project	Moccasin, CA	3.3 GWh	0.9 mi
New Melones	Jamestown, CA	370.0 GWh	15.7 mi
Pacific-Ultrapower Chinese Station	Jamestown, CA	101.9 GWh	10.7 mi
Phoenix	Sonora, CA	4.9 GWh	15.5 mi
R C Kirkwood	Groveland, CA	489.0 GWh	19.5 mi
Sierra Pacific Chinese Camp	Chinese Camp, CA	4.5 GWh	9.9 mi
Sierra Pacific Sonora	Standard, CA	42.7 GWh	10.9 mi
Sonora 1	Jamestown, CA	858.0 MWh	13.7 mi
Stanislaus	Vallecito, CA	199.8 GWh	23.1 mi
Tulloch	Jamestown, CA	103.2 GWh	17.3 mi
Turlock Lake	Hickman, CA	3.2 GWh	21.2 mi
Upper Dawson	La Grange, CA	8.9 GWh	14.4 mi