Dion R Holm

Cherry Lake Road, Groveland, CA 95321

Plant Summary Information

Dion R Holm is ranked #6 out of 207 hydroelectric power plants in California in terms of total annual net electricity generation.

Dion R Holm is comprised of 2 generators and generated 247.3 GWh during the 3-month period between February 2026 to May 2026.

Plant Name	Dion R Holm
Utility Name	City & County of San Francisco - (CA)
Location	Tuolumne County, CA
Initial Operation Date	August 1960
Last Update	May 2026
Annual Generation	577.8 GWh
Annual Consumption	2.3 M MMBtu
Ranked #1,182 out of 13,081 Power Plants Nationwide
Ranked #65 out of 1,311 Water Power Plants Nationwide
Ranked #64 out of 1,606 California Power Plants
Ranked #6 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	Dion R Holm (380)
Plant Address	Cherry Lake Road, Groveland, CA 95321
Utility	City & County of San Francisco - (CA) (16612)
Latitude, Longitude	37.89665, -119.9675
Generation Dates on File	Jan 2001 to May 2026
Initial Operation Date	August 1960
Annual Generation	577.8 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	Cherry Reservoir
Ash Impoundment	No
Transmission / Distribution Owner	City & County of San Francisco (16612) CA
Grid Voltage	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	90.1 MW
Nameplate Power Factor	0.95
Summer Capacity	90.13 MW
Winter Capacity	90.13 MW
Minimum Load	1 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	August 1960
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

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	90.1 MW
Nameplate Power Factor	0.95
Summer Capacity	90.13 MW
Winter Capacity	90.13 MW
Minimum Load	1 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	August 1960
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
#55	Big Bend Dam	Chamberlain, SD	745.8 GWh
#56	Ross	Rockport, WA	714.9 GWh
#57	Gavins Point	Crofton, NE	694.0 GWh
#58	Chickamauga	Chattanooga, TN	693.8 GWh
#59	Palisades Dam	Palisades, ID	657.3 GWh
#60	Bull Shoals	Mountain Home, AR	647.3 GWh
#61	Fort Loudoun	Lenoir City, TN	633.1 GWh
#62	Hungry Horse	Columbia Falls, MT	632.9 GWh
#63	Barkley	Kuttawa, KY	624.9 GWh
#64	Mayfield	Silver Creek, WA	602.5 GWh
#66	Nickajack	New Hope, TN	577.6 GWh
#67	Calderwood	Tallassee, TN	568.7 GWh
#68	Mammoth Pool	North Fork, CA	568.6 GWh
#69	Yellowtail	Hardin, MT	566.2 GWh
#70	J Strom Thurmond	Clarks Hill, SC	566.0 GWh
#71	Folsom	Folsom, CA	537.6 GWh
#72	James B Black	Big Bend, CA	530.6 GWh
#73	Diablo	Rockport, WA	518.2 GWh
#74	Dardanelle	Dardanelle, AR	517.3 GWh
#75	Guntersville	Guntersville, AL	509.1 GWh

Below are closest 20 power plants surrounding Dion R Holm.

Plant Name	Plant Location	Annual Generation	Distance
Beardsley	None, CA	56.4 GWh	22 mi
Collierville Powerhouse	Murphys, CA	396.3 GWh	28.3 mi
Don Pedro	La Grange, CA	285.7 GWh	28.3 mi
Donnells	None, CA	233.4 GWh	24.5 mi
Exchequer	Snelling, CA	245.8 GWh	27.1 mi
La Grange	La Grange, CA	6.6 GWh	30.4 mi
McSwain	Snelling, CA	26.9 GWh	31.9 mi
Moccasin	Moccasin, CA	307.6 GWh	19.1 mi
Moccasin Low Head Hydro Project	Moccasin, CA	3.3 GWh	19.6 mi
Murphys	Murphys, CA	14.8 GWh	31.3 mi
New Melones	Jamestown, CA	370.0 GWh	30.8 mi
Pacific-Ultrapower Chinese Station	Jamestown, CA	101.9 GWh	27.9 mi
Phoenix	Sonora, CA	4.9 GWh	21.7 mi
R C Kirkwood	Groveland, CA	489.0 GWh	1.5 mi
Sand Bar Power Plant	Stanislaus Ntl. Fores, CA	82.5 GWh	22.3 mi
Sierra Pacific Chinese Camp	Chinese Camp, CA	4.5 GWh	26.6 mi
Sierra Pacific Sonora	Standard, CA	42.7 GWh	19.7 mi
Sonora 1	Jamestown, CA	858.0 MWh	30.6 mi
Spring Gap	Long Barn, CA	11.6 GWh	21.5 mi
Stanislaus	Vallecito, CA	199.8 GWh	27.6 mi