Diablo

OperatingHydro

Ranked #17 of 75 Hydro plants in WA#101 of 1454 nationally

182.4 MW Hydro operating in Whatcom, WA — Seattle City Light

EIAGEMWD

182.4 MW

Nameplate Capacity

Generators

units

Conventional Hydroelectric

Technology

1936

Operating Since

Location

Coordinates

48.7139, -121.1317

County

Whatcom, WA

Nearby Plants

Ross
Hydro450 MW · 5.1 km
Gorge
Hydro207.3 MW · 5.9 km
Newhalem
Hydro2.3 MW · 9.0 km

Ownership & Operator

Owner data does not fully agree across sources.

EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.

Field	EIA	GEM	Wikidata
Operator	City of Seattle - (WA)	Seattle City Light	—
Owner(s)	City of Seattle - (WA)	Seattle City Light [100%]	—
Status	Operating	operating	—

Ownership Chain

GEM identifies the owner as Seattle City Light [100%]

This entity is not yet in the GEM ownership database — chain unavailable.

About

Diablo Dam is one of three dams along the upper Skagit River in Whatcom County, Washington and part of the Skagit River Hydroelectric Project that supplies Seattle with some of its power needs. The dam was built in Diablo Canyon, a gorge of solid granite with vertical walls rising 160 feet (49 m) from the river bed, yet were less than 100 feet (30 m) apart. Construction began in 1927, and was completed in 1930. The dam began generating electricity in 1936. The town of Diablo was established to house the workers building the dam.

Read more on Wikipedia

The Diablo hydroelectric plant, identified by plant ID 6432, is located in Whatcom County, Washington. The plant has a total capacity of 182.4 MW across four generators, utilizing conventional hydroelectric technology and water as its primary fuel source. It began operating in 1936 and is owned and operated by the City of Seattle - (WA). Diablo operates within the Seattle City Light balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.

Diablo's latest annual generation was 361,708 MWh, resulting in a capacity factor of 22.6%. The plant is ranked as the 17th largest in Washington out of 23 plants and 101st nationally out of 194 plants. News coverage related to the plant includes 5 articles categorized as regulatory, 4 as industry-related, and 1 pertaining to the grid.

Generated from EIA, GEM, and public data sources