Washington — Energy Landscape

Washington's power generation fleet is overwhelmingly dominated by wind and battery storage, with a clear emphasis on large-scale renewable projects.

Dominance of Wind and Storage Technologies

• Washington's current operating fleet consists primarily of renewable energy sources, with wind power accounting for 24 out of 25 plants, representing 3.5 GW of the total capacity.

• One large battery storage plant, Hop Hill Solar Generation and BESS, contributes significantly, providing 2.6 GW of capacity, making it the largest plant in the state.

• The state operates 2 hybrid plants combining solar with storage or wind with storage, indicating a trend towards integrated renewable solutions.

Top Capacity Plants in Washington

• The Hop Hill Solar Generation and BESS plant is by far the largest in Washington, with a capacity of 2,600 MW.

• Following Hop Hill, the largest wind facilities include Lower Snake River Wind Energy Project (342.7 MW), Wild Horse (273.1 MW), and Tucannon River Wind Farm (266.8 MW).

• The Windy Flats Wind Project rounds out the top five, contributing an additional 262.2 MW to the state's generation capacity.

Key Finding: Recent news signals in Washington indicate significant regulatory activity, including approvals for new facilities and legal challenges to existing plant operations, alongside notable operational constraints.

Regulatory and Development Activity

Recent news signals point to a dynamic regulatory landscape and active development discussions within Washington.

• "Examiner OKs controversial energy facility in Thurston Co.": This approval signal on 2026-03-19 indicates progress for new energy infrastructure development.
• "DOE keeps TransAlta (NYSE: TAC) Centralia Unit 2 available 90 days": A FERC Order on 2026-03-17 highlights federal intervention to maintain generation capacity at the TransAlta Centralia plant.
• "Washington state sues US Department of Energy over records in decision to keep Centralia coal plant running": A lawsuit filed on 2026-03-09 signals ongoing legal and policy disputes regarding existing generation assets, specifically the Centralia coal plant.
• "Local lawmakers move to make Spokane's Waste-to-Energy facility exempt from state climate act": A filing with the State PUC on 2026-02-28 demonstrates legislative efforts to influence regulatory frameworks for specific energy facilities, in this case, the Spokane Waste-to-Energy facility.

Operational Constraints and Challenges

The state's energy sector has also faced recent operational challenges and potential constraints.

1. Nuclear Plant Outages: Two separate articles on 2026-02-28 and 2026-02-12 reported the shutdown of the "Northwest’s only nuclear power plant" due to detected problems, indicating vulnerabilities in critical generation assets.
2. Permit Appeals: "Spokane officials look for grace from Washington lawmakers on energy-generating trash incinerator" on **

Interconnection Queue Composition

• The Washington interconnection queue currently contains 28 projects, all of which are actively proceeding.

• The entire proposed capacity of 6.6 GW across all projects is exclusively from Wind technology, indicating a strong focus on this renewable source.

• There are no proposed projects for solar, battery storage, or hybrid facilities within the current queue.

Largest Proposed Wind Projects

• The largest individual project in the queue is a 600 MW wind facility in Washington, currently active.

• This is followed by another active wind project of 500 MW in Washington.

• Two additional active wind projects of 350 MW each are also in the queue, along with a 313 MW wind project, further highlighting the scale of proposed wind development.

The interconnection queue for Washington overwhelmingly indicates a future heavily reliant on large-scale wind power development, with no other generation or storage technologies currently represented, suggesting a concentrated development strategy for renewable capacity.