United States of America

Diablo— 182.4 MW Hydroelectric

HydroRenewableVerified: Jul 2026

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The Diablo power generation facility in the United States ranks as the 1488th largest plant nationwide, with a capacity of 182.4 MW. This hydroelectric facility holds a notable position as the 108th largest among the 1,469 hydro plants in the country. While its output represents only 0.01% of the United States' total capacity of 1,386,385 MW, Diablo's role is critical in the context of regional energy production and sustainability. The facility operates on the principle of converting the energy of flowing water into electricity, making it a vital part of the renewable energy mix in Washington State. Situated within a region characterized by several hydroelectric facilities, Diablo is in proximity to other significant plants, such as the Ross plant, which has a capacity of 450 MW, and Gorge, contributing 207.3 MW. The nearby Newhalem facility, although smaller at 2.3 MW, adds to the local hydro network, further establishing the region as an important hub for hydropower. This collaborative network of power generation facilities underscores the importance of hydroelectricity in providing a stable and renewable energy source for the Pacific Northwest. The United States has a total of 10,047 power plants, with gas being the dominant fuel type. Diablo's contribution, while modest in terms of national capacity, plays a significant role in the state’s energy landscape, which is increasingly focusing on reducing greenhouse gas emissions through the integration of renewable energy sources. As the nation moves towards a more sustainable energy future, hydroelectric power plants like Diablo are essential in meeting these evolving energy demands. Owned and operated by the City of Seattle, Diablo has been in operation since 1936, making it one of the older hydro plants in the region. Its historical significance and continuous operation reflect the longstanding value of hydroelectric energy in the United States. As Seattle and the broader region push towards ambitious climate goals, Diablo stands as a key player in the transition towards a cleaner energy paradigm, promising both environmental benefits and economic resilience.