Hydroelectric power plants in Washington

68 operating hydroelectric power plants in Washington with 19,757 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.

Plants

Hydroelectric capacity

19,757 MW

Net generation, 2025

64.6 TWh

Largest

Grand Coulee

6,495 MW

Largest hydroelectric power plants in Washington

#	Plant	Hydroelectric MW	2025 net generation, GWhGWh, 2025	Capacity factor	Operator
1	Grand CouleeGrant County	6,495	16,151	–	U S Bureau of Reclamation
2	Chief JosephDouglas County	1,744	9,806	45.6%	USACE Northwestern Division
3	Rocky ReachChelan County	1,349	5,241	–	PUD No 1 of Chelan County - (WA)
4	WanapumGrant County	1,220	4,438	41.5%	PUD No 2 of Grant County - (WA)
5	BoundaryPend Oreille County	1,160	3,099	30.5%	City of Seattle - (WA)
6	Priest RapidsGrant County	950	4,165	50.0%	PUD No 2 of Grant County - (WA)
7	WellsChelan County	789	3,708	–	PUD No 1 of Douglas County - (WA)
8	Lower MonumentalWalla Walla County	675	1,477	20.8%	USACE Northwestern Division
9	Lower GraniteWhitman County	675	1,461	20.6%	USACE Northwestern Division
10	Little GooseColumbia County	540	1,589	22.4%	USACE Northwestern Division
11	Rock IslandChelan County	514	2,227	40.4%	PUD No 1 of Chelan County - (WA)
12	RossWhatcom County	450	532	13.5%	City of Seattle - (WA)
13	Ice HarborWalla Walla County	423	1,511	28.6%	USACE Northwestern Division
14	MossyrockLewis County	300	903	34.3%	City of Tacoma - (WA)
15	Swift 1Skamania County	240	535	25.4%	PacifiCorp
16	GorgeWhatcom County	207	769	42.3%	City of Seattle - (WA)
17	DiabloWhatcom County	182	518	32.4%	City of Seattle - (WA)
18	MayfieldLewis County	162	603	42.5%	City of Tacoma - (WA)
19	MerwinCowlitz County	136	423	35.5%	PacifiCorp
20	YaleCowlitz County	134	472	40.2%	PacifiCorp
21	H M JacksonSnohomish County	112	334	34.1%	PUD No 1 of Snohomish County - (WA)
22	Upper BakerWhatcom County	105	333	36.2%	Puget Sound Energy Inc
23	Lower BakerSkagit County	104	365	40.1%	Puget Sound Energy Inc
24	Summer Falls Power PlantGrant County	92	391	48.5%	Columbia Basin Hydropower
25	Box CanyonPend Oreille County	90	460	58.3%	PUD No 1 of Pend Oreille County - (WA)
26	Cushman 2Mason County	85	160	21.7%	City of Tacoma - (WA)
27	Long LakeLincoln County	70	435	71.0%	Avista Corp
28	Cowlitz FallsLewis County	70	196	31.9%	PUD No 1 of Lewis County - (WA)
29	LaGrandePierce County	64	291	51.9%	City of Tacoma - (WA)
30	ChelanChelan County	59	325	62.7%	PUD No 1 of Chelan County - (WA)
31	AlderPierce County	51	187	–	City of Tacoma - (WA)
32	Cushman 1Mason County	50	108	–	City of Tacoma - (WA)
33	Little Falls (WA)Lincoln County	43	189	49.9%	Avista Corp
34	Snoqualmie 2King County	39	107	31.5%	Puget Sound Energy Inc
35	Nine MileSpokane County	38	132	40.1%	Avista Corp
36	Cedar Falls (WA)King County	30	53.6	20.4%	City of Seattle - (WA)
37	PackwoodLewis County	28	73.8	30.7%	Energy Northwest - Packwood
38	Main Canal HeadworksGrant County	27	105	44.8%	Columbia Basin Hydropower
39	Twin Falls HydroKing County	24	59.3	28.2%	Central Rivers Power US, LLC
40	ElectronPierce County	23	0.0	–	Electron Hydro LLC
41	Upriver Dam Hydro PlantSpokane County	18	39.9	25.9%	City of Spokane - (WA)
42	South Fork ToltKing County	17	48.6	33.0%	City of Seattle - (WA)
43	Monroe StreetSpokane County	15	87.5	67.5%	Avista Corp
44	Tieton Dam Hydro Electric ProjectYakima County	14	24.2	20.0%	City of Burbank Water and Power - (CA)
45	RozaYakima County	13	38.2	33.8%	U S Bureau of Reclamation
46	SnoqualmieKing County	13	59.2	52.8%	Puget Sound Energy Inc
47	WynoocheeGrays Harbor County	13	22.5	20.1%	City of Tacoma - (WA)
48	YelmThurston County	12	32.2	30.7%	City of Centralia - (WA)
49	ChandlerBenton County	12	27.6	26.2%	U S Bureau of Reclamation
50	Koma KulshanWhatcom County	12	32.3	30.8%	Eagle Creek Renewable Energy, LLC
51	McNary Dam Fish Attraction ProjectBenton County	10	72.5	82.8%	Northern Wasco County PUD - (OR)
52	Upper FallsSpokane County	10	42.0	48.0%	Avista Corp
53	Youngs Creek Hydroelectric ProjectSnohomish County	7.5	12.9	19.6%	PUD No 1 of Snohomish County - (WA)
54	Russell D SmithAdams County	6.1	14.4	26.9%	Columbia Basin Hydropower
55	Calligan Creek Hydroelectric ProjectKing County	6.0	12.6	24.1%	PUD No 1 of Snohomish County - (WA)
56	Hancock Creek Hydroelectric ProjectKing County	6.0	18.3	34.7%	PUD No 1 of Snohomish County - (WA)
57	Weeks FallsKing County	4.3	10.7	28.3%	Eagle Creek Renewable Energy, LLC
58	Black CreekKing County	3.7	8.7	26.9%	Black Creek Hydro Inc
59	Potholes East Canal 66.0Franklin County	2.3	3.2	16.0%	Columbia Basin Hydropower
60	Twin ReservoirsWalla Walla County	2.2	6.9	35.6%	City of Walla Walla - (WA)
61	Eltopia Branch Canal 4.6Franklin County	2.2	7.7	39.9%	Columbia Basin Hydropower
62	Meyers FallsStevens County	1.8	8.7	–	Hydro Technology Systems Inc
63	CowicheYakima County	1.7	3.4	22.5%	Yakima-Tieton Irrigation Dist
64	Sheep Creek HydroStevens County	1.6	6.8	48.5%	Sheep Creek Hydro Inc
65	Orchard Avenue 1Yakima County	1.6	2.9	20.9%	Yakima-Tieton Irrigation Dist
66	Nooksack HydroWhatcom County	1.5	20.2	153.5%	Puget Sound Hydro LLC
67	Lilliwaup Falls GeneratingMason County	1.4	5.3	43.4%	William G. Reed Jr
68	SkookumchuckThurston County	1.0	0.3	3.0%	TransAlta Centralia Gen LLC

Projects where hydroelectric is the largest fuel or at least a fifth of nameplate capacity. MW is hydroelectric nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources

More power plant lists for Washington

Largest power plants in Washington50 plants · 27,210 MW Solar farms in Washington9 plants · 348 MW Wind farms in Washington23 plants · 3,387 MW Battery storage projects in Washington3 projects · 4 MW Natural gas power plants in Washington14 plants · 3,657 MW

All plants in Washington Largest hydroelectric power plants in the US