Merwin

300 Merwin Village Road, Ariel, WA 98603

Plant Summary Information

Merwin is ranked #40 out of 132 power plants in Washington in terms of total annual net electricity generation.

Merwin is comprised of 4 generators and generated 132.8 GWh during the 3-month period between September 2025 to December 2025.

Plant Name	Merwin
Utility Name	PacifiCorp
Location	Cowlitz County, WA
Initial Operation Date	July 1931
Last Update	Dec 2025
Annual Generation	422.6 GWh
Annual Consumption	1.6 M MMBtu
Ranked #1,566 out of 13,094 Power Plants Nationwide
Ranked #99 out of 1,309 Water Power Plants Nationwide
Ranked #40 out of 132 Washington Power Plants
Ranked #22 out of 70 Washington Water Power Plants
Fuel Types	Water

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Summary Information
Plant Name	Merwin (3847)
Plant Address	300 Merwin Village Road, Ariel, WA 98603
Utility	PacifiCorp (14354)
Latitude, Longitude	45.9567, -122.55444
Generation Dates on File	Jan 2001 to Dec 2025
Initial Operation Date	July 1931
Annual Generation	422.6 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	PacifiCorp - West (PACW)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Lewis River
Ash Impoundment
Transmission / Distribution Owner	PacifiCorp (14354) WA
Grid Voltage	115.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	1 MW
Nameplate Power Factor	0.8
Summer Capacity	1 MW
Winter Capacity	1 MW
Minimum Load	0.1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	July 1931
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	45 MW
Nameplate Power Factor	0.8
Summer Capacity	50 MW
Winter Capacity	50 MW
Minimum Load	0.1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	January 1932
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	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	45 MW
Nameplate Power Factor	0.8
Summer Capacity	50 MW
Winter Capacity	50 MW
Minimum Load	0.1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	December 1949
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	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	45 MW
Nameplate Power Factor	0.8
Summer Capacity	50 MW
Winter Capacity	50 MW
Minimum Load	0.1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	September 1958
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	10M
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
#89	Kerckhoff 2	Auberry, CA	443.6 GWh
#90	Jaybird	Camino, CA	441.8 GWh
#91	Cordell Hull	Carthage, TN	441.3 GWh
#92	Thompson Falls	Thompson Falls, MT	439.8 GWh
#93	White Rock/Slab Creek	Placerville, CA	438.7 GWh
#94	Long Lake	Ford, WA	435.4 GWh
#95	Middle Fork	Foresthill, CA	434.8 GWh
#96	Fairfield Pumped Storage	Jenkinsville, SC	433.6 GWh
#97	Smithland Hydroelectric Plant	Smithland, KY	433.6 GWh
#98	Belden	Belden, CA	432.0 GWh
#100	Pensacola	Langley, OK	422.2 GWh
#101	Cannelton Hydroelectric Plant	Hawesville, KY	416.9 GWh
#102	Norris Dam	Norris, TN	416.3 GWh
#103	Bradley Lake	Homer, AK	414.7 GWh
#104	New Melones	Jamestown, CA	410.5 GWh
#105	Big Creek 1	Big Creek, CA	409.1 GWh
#106	Pelton	Madras, OR	399.6 GWh
#107	Keswick	Redding, CA	399.3 GWh
#108	Walter Bouldin Dam	Wetumpka, AL	398.5 GWh
#109	Big Creek 4	North Fork, CA	397.6 GWh

Below are closest 20 power plants surrounding Merwin.

Plant Name	Plant Location	Annual Generation	Distance
Beaver	Clatskanie, OR	1.9 TWh	33.2 mi
Bonneville	Cascade Locks, OR	4.1 TWh	36.6 mi
Boring Solar LLC	Sandy, OR	3.9 GWh	38.6 mi
Dunn Road Solar	Sandy, OR	2.8 GWh	38.6 mi
Durham AWTF	Tigard, OR	8.2 GWh	39.8 mi
Longview Fibre	Longview, WA	248.5 GWh	20.2 mi
Mayfield	Silver Creek, WA	602.5 GWh	37.8 mi
MilfordSolar OR	Forest Grove, OR	4.2 GWh	35.8 mi
Mint Farm Generating Station	Longview, WA	2.3 TWh	24.2 mi
Nippon Dynawave Packaging Longview WA	Longview, WA	266.6 GWh	23.1 mi
NSE Astoria - Skyward	Boring, OR	4.1 GWh	39.5 mi
Oregon Convention Center	Portland, OR	1.5 GWh	30 mi
Port Westward	Clatskanie, OR	2.9 TWh	33.4 mi
Port Westward Unit 2	Clatskanie, OR	1.1 TWh	33.3 mi
River Road Gen Plant	Vancouver, WA	812.4 GWh	22.8 mi
Sandy River Solar (CSG)	Sandy, OR	2.3 GWh	38.4 mi
SSD Clackamas 1, LLC	Boring, OR	6.1 GWh	38.6 mi
SulusSolar29	Boring, OR	3.8 GWh	36.6 mi
Swift 1	Cougar, WA	503.6 GWh	18.4 mi
Yale	Amboy, WA	472.5 GWh	10.5 mi