Mossyrock

418 Gershick Road, Silver Creek, WA 98585

Plant Summary Information

Mossyrock is ranked #39 out of 1,256 hydroelectric power plants nationwide in terms of total annual net electricity generation.

Mossyrock is comprised of 2 generators and generated 351.9 GWh during the 3-month period between December 2025 to March 2026.

Plant Name	Mossyrock
Utility Name	City of Tacoma - (WA)
Location	Lewis County, WA
Initial Operation Date	October 1968
Last Update	Mar 2026
Annual Generation	1.0 TWh
Annual Consumption	3.7 M MMBtu
Ranked #745 out of 12,332 Power Plants Nationwide
Ranked #39 out of 1,256 Water Power Plants Nationwide
Ranked #21 out of 128 Washington Power Plants
Ranked #13 out of 67 Washington Water Power Plants
Fuel Types	Water
Previous Operator	City of Tacoma - (WA) (2013 to 2015) City of Tacoma - (WA) (2016 to 2024)

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Summary Information
Plant Name	Mossyrock (3918)
Plant Address	418 Gershick Road, Silver Creek, WA 98585
Utility	City of Tacoma - (WA) (18429)
Latitude, Longitude	46.5347, -122.4247
Generation Dates on File	Jan 2001 to Mar 2026
Initial Operation Date	October 1968
Annual Generation	1.0 TWh
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	City of Tacoma, Department of Public Utilities, Light Division (TPWR)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Cowlitz River
Ash Impoundment	No
Transmission / Distribution Owner	City of Tacoma - (WA) (18429) WA
Grid Voltage	240.00 kV
Energy Storage	No

* Data obtained from the 2024 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	150 MW
Nameplate Power Factor	1
Summer Capacity	157 MW
Winter Capacity	147 MW
Minimum Load	85 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	October 1968
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Time From Cold Shutdown To Full Load	1H

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	150 MW
Nameplate Power Factor	1
Summer Capacity	186 MW
Winter Capacity	175.3 MW
Minimum Load	100 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	November 1968
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Time From Cold Shutdown To Full Load	1H

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
#29	Ice Harbor	Burbank, WA	1.5 TWh
#30	Hoover Dam (NV)	Boulder City, NV	1.5 TWh
#31	Dworshak	Ahsahka, ID	1.4 TWh
#32	Colgate	Dobbins, CA	1.3 TWh
#33	Noxon Rapids	Noxon, MT	1.3 TWh
#34	Pickwick Landing Dam	Pickwick Dam, TN	1.3 TWh
#35	Hoover Dam (AZ)	Boulder City, AZ	1.2 TWh
#36	Wheeler Dam	Town Creek, AL	1.2 TWh
#37	Kentucky Dam	Grand Rivers, KY	1.2 TWh
#38	Safe Harbor	Conestoga, PA	1.0 TWh
#40	Selis Ksanka Qlispe	Polson, MT	970.3 GWh
#41	Oxbow (OR)	Oxbow, OR	965.3 GWh
#42	Davis Dam	Kingman, AZ	958.2 GWh
#43	Watts Bar Hydro	Spring City, TN	895.6 GWh
#44	Gorge	Rockport, WA	893.9 GWh
#45	Keokuk	Keokuk, IA	888.3 GWh
#46	Sidney A Murray Jr Hydroelectric	Vidalia, LA	885.2 GWh
#47	Fontana Dam	Fontana Dam, NC	879.0 GWh
#48	Devil Canyon	San Bernardino, CA	875.6 GWh
#49	Holtwood	Holtwood, PA	866.1 GWh

Below are closest 20 power plants surrounding Mossyrock.

Plant Name	Plant Location	Annual Generation	Distance
Alder	La Grande, WA	182.9 GWh	19.2 mi
Chehalis Generating Facility	Chehalis, WA	2.3 TWh	24 mi
Cowlitz Falls	Randle, WA	196.3 GWh	15.7 mi
Frederickson	Tacoma, WA	87.8 GWh	37.8 mi
Frederickson Power LP	Tacoma, WA	1.7 TWh	38.2 mi
LaGrande	La Grande, WA	297.3 GWh	21.2 mi
Longview Fibre	Longview, WA	235.4 GWh	38 mi
LRI LFGTE Facility	Graham, WA	32.1 GWh	31.1 mi
Mayfield	Silver Creek, WA	576.4 GWh	8.1 mi
Merwin	Ariel, WA	467.3 GWh	40.4 mi
Mint Farm Generating Station	Longview, WA	2.3 TWh	38.3 mi
Nippon Dynawave Packaging Longview WA	Longview, WA	271.2 GWh	38.6 mi
Packwood	Packwood, WA	63.0 GWh	40.8 mi
Port Westward Unit 2	Clatskanie, OR	1.1 TWh	43.3 mi
Skookumchuck	Tenino, WA	2.2 GWh	22.2 mi
Skookumchuck Wind Facility	Rainier, WA	405.7 GWh	24.6 mi
Swift 1	Cougar, WA	548.4 GWh	34.4 mi
Transalta Centralia Generation	Centralia, WA	3.2 TWh	25.7 mi
Yale	Amboy, WA	488.4 GWh	39.7 mi
Yelm	Yelm, WA	33.7 GWh	32 mi