Washington Clean Energy Guide

Washington is the great paradox of American clean energy: one of the country's cleanest grids and one of its slowest builders of new renewables. Hydropower supplied 59.3% of in-state generation in 2024 and total carbon-free output reached 79.2%, yet wind, solar, and storage together account for just 9.1% of generation — 35th among states. With the Clean Energy Transformation Act's greenhouse-gas-neutral deadline hitting in 2030 and a projected 9 GW regional shortfall bearing down, the state that could once coast on its dams no longer can.

The Policy Stack: 2045 Is the Headline, 2030 Is the Deadline That Bites

The Clean Energy Transformation Act (CETA) — Senate Bill 5116, passed in 2019 and codified at RCW 19.405 — is the spine of Washington energy policy. It required utilities to eliminate coal-fired generation serving Washington customers by 2025, demands greenhouse-gas-neutral retail sales by January 1, 2030, and mandates 100% renewable or non-emitting electricity by 2045. The law includes reliability off-ramps and consumer cost protections, and the Utilities and Transportation Commission polices investor-owned utilities through Clean Energy Implementation Plans — utilities have filed plans for 2026-2029 aimed squarely at the 2030 standard. HB 1329 (2025) clarified compliance rules around coal resources and short-term wholesale purchases, but the core targets are unchanged.

The money side runs through the Climate Commitment Act, the 2021 cap-and-invest law that raised roughly $1.8 billion in carbon allowance auctions during 2023, its first full year. Its political durability is no longer in question: Initiative 2117, the repeal measure, lost at the ballot on November 5, 2024 by roughly 62% to 38%. Washington voters, given a clean shot at killing the state's carbon market, declined emphatically.

Olympia's 2025-26 Scorecard: Transmission Wins, Data Centers Punt

The 2025 session produced workmanlike gains — HB 1018 made fusion facilities eligible for EFSEC siting, HB 1253 expanded joint agreements for transmission and generation development, SB 5445 promoted distributed resources, storage, microgrids, and agrivoltaics, and SB 5317 gave local governments liability protection when servicing EFSEC-approved projects. The reform bills that mattered most both died: HB 1237, which would have sped up EFSEC's decision timeline, and HB 1188, which would have required local and tribal approval of EFSEC wind and solar recommendations.

The 2026 session's biggest win was SB 6355, which creates the Washington Electric Transmission Authority — a statewide entity to coordinate, plan, and advance grid-expanding transmission projects with utilities, tribes, labor, local governments, and private developers. Sponsored by Sen. Victoria Hunt, it was signed by Gov. Ferguson on March 31, 2026 and took effect June 10, 2026, after its predecessor SB 5466 died in two straight sessions. The session's biggest failure was HB 2515, the comprehensive data-center energy bill covering cost allocation, curtailment, and CETA alignment: it passed the House 51-41 and died in the Senate at March adjournment, punting the issue to 2027. A narrower measure, SB 5982, did pass — requiring large customers including data centers to meet the same clean-energy deadlines as utilities, with UTC compliance reporting.

The executive branch is moving faster than the legislature. Executive Order 25-11 (December 16, 2025) created a Joint Clean Energy Acceleration Team under Commerce, directing seven cabinet agencies to expedite permit reviews so projects can capture federal tax credits before they lapse under the 2025 federal tax changes — and extending prioritized review to substations and transmission. EO 25-05 stood up a Data Center Workgroup to evaluate data centers' impact on the grid, taxes, and climate goals.

Incentives and Net Metering

• Net Metering: Under RCW 80.60, utilities must offer net metering to customer generators up to 100 kW, until the earlier of June 30, 2029 or the date net-metered capacity reaches 4% of the utility's 1996 peak demand.
• Sales Tax Exemption: 100% state sales/use tax exemption for solar systems under 100 kW through December 2029; 50% exemption for systems of 101-500 kW.
• Federal Residential Credit: The 30% federal residential clean energy credit is not available for property placed in service after December 31, 2025 — a major blow to the state's residential solar market.
• Legacy RPS: The Energy Independence Act (Initiative 937, 2006) remains on the books but has been superseded in practice by CETA.

The Projects: An Aging Wind Fleet and One 1,150 MW Lightning Rod

Nothing captures Washington's siting dysfunction like the Horse Heaven Clean Energy Center — at up to 1,150 MW of wind (up to 222 turbines), solar, and battery storage across a roughly 72,000-acre lease boundary in Benton County, the largest clean energy project ever permitted in the state. Scout Clean Energy, owned by Brookfield, filed its application in February 2021. Gov. Inslee approved it in October 2024, rejecting EFSEC's recommendation to shrink the project, and the site certification agreement was signed October 18, 2024. Then in October 2025, EFSEC unanimously adopted Resolution 357 imposing ferruginous-hawk protections — 2-mile buffers around five viable nests — striking 39 turbines plus a solar array; Scout had warned the combined restrictions would cut about 348 MW, roughly a third of the project's capacity. The Washington Supreme Court heard consolidated challenges from Benton County, the Yakama Nation, and Tri-Cities CARES on June 11, 2026, with a ruling still pending. Scout says it cannot finalize interconnection agreements or PPAs until the permit is non-appealable. Five and a half years after application, not a single turbine is up.

The Operating Fleet

• Lower Snake River (Garfield County): 342.7 MW, 149 turbines — Puget Sound Energy's flagship and the state's largest single wind facility, operating since early 2012
• Wild Horse (Kittitas County): 273 MW of wind plus a 500 kW solar array, PSE-owned, operating since December 2006 and expanded in 2009
• Rattlesnake Flat (Adams County): 160 MW, 57 turbines, developed by Clearway Energy Group under a 20-year PPA with Avista, online December 15, 2020
• Lund Hill Solar (Klickitat County): 150 MW, the state's largest utility-scale solar farm, built by Avangrid Renewables partly on state DNR trust land — the state's first solar land lease — serving PSE's Green Direct program since February 28, 2023

Note the dates: Washington's largest wind farms came online in 2006 and 2012. The buildout largely stalled for a decade — which is why Gov. Ferguson, approving the Carriger solar project in December 2025, said Washington "lags behind all other states in renewable energy growth."

The Battery Rush Is Just Starting

EIA counted just 6 MW of utility battery capacity in Washington through 2024 — a rounding error for a state this size. That is finally changing. The 200 MW / 800 MWh Greenwater Energy Storage project in Sumner (Pierce County), from BrightNight and Cordelio Power, reached financial close on December 4, 2025 and is expected online by end of 2026 as the first large-scale battery in Puget Sound Energy's territory. Snohomish County PUD's 25 MW Ameresco system near Arlington is due in fall 2026 as western Washington's first utility-scale battery. And Carriger Solar in Klickitat County — up to 160 MW of solar plus a 63 MW battery from Cypress Creek Renewables — won Gov. Ferguson's approval December 4, 2025, racing a July 4, 2026 construction-start deadline to qualify for expiring federal tax credits. PSE is targeting 1,500 MW of storage by 2030.

Siting: EFSEC Can Overrule Any County — and Every Fight Proves It

Washington runs a two-track siting system, and the state track is the story. The Energy Facility Site Evaluation Council (EFSEC), created in 1970 under RCW 80.50, is a one-stop siting council whose recommendation goes to the governor for a final, binding decision — and its authority supersedes local zoning. EFSEC ruled that Klickitat County's solar moratorium, passed roughly a month before Cypress Creek applied for Carriger, was not a land-use law capable of blocking the project; the state approved Carriger anyway in December 2025. It likewise overrode Benton County's 2021 restrictions that had effectively banned utility-scale wind and solar, clearing the way for Horse Heaven. The statute requires EFSEC recommendations within 12 months of application — a deadline the council routinely blows through. Horse Heaven took about 3.5 years; Carriger about 2.8. There are no statewide setback standards for wind or solar; buffers are set project-by-project through EFSEC mitigation or county code.

That preemption power has made EFSEC a flashpoint in the state's largely rural, conservative east. A 2024 Columbia University Sabin Center survey counted nearly 400 U.S. local jurisdictions restricting wind and solar, with Kittitas, Yakima, Grant, and Klickitat among the Washington counties named. Yakima County held a moratorium on moderate- and large-scale solar from mid-2022 — extended unanimously as recently as January 29, 2025 over water rights, farmland, and fire concerns — before commissioners finally replaced it in spring 2026 with a siting ordinance covering visual impacts, critical areas, and water resources. Tribal opposition cuts deepest: the Yakama Nation fought both Horse Heaven (sacred sites and wildlife) and Carriger (food and medicine harvest areas), and its Tribal Council chairman publicly rebuked Gov. Ferguson after the Carriger approval, which came with a $100,000, ten-year commitment for cultural resource documentation. We track every county action, moratorium, and lawsuit in our Washington opposition tracker.

The New Front: Battery Storage Moratoria

The opposition playbook has found a new target. As of June 2026, at least six western Washington jurisdictions — Snoqualmie, Carnation, North Bend, Puyallup, Duvall, and Kitsap County — voted within a single month to impose or extend commercial battery-storage moratoria, following earlier bans in Bonney Lake, Black Diamond, Covington, Enumclaw, Maple Valley, and Mount Vernon. The chief concern is lithium-ion fire and toxic smoke risk, and jurisdictions are drafting screening, setback, and fire-response rules. Roughly eight battery proposals are in permitting across PSE territory, most facing serious pushback; a 130 MW Jupiter Power project near Snoqualmie is testing King County's new siting standards. PSE has already withdrawn about a dozen early-stage battery proposals from its interconnection queue — even as it targets 1,500 MW of storage by 2030. The math does not work if the moratoria wave keeps spreading.

Demand: "2 to 4 Additional Seattles" Meet a 9 GW Hole

The demand shock has arrived. An E3 study commissioned by the Public Generating Pool, released in October 2025, projects a potential 1 GW Northwest shortfall as soon as 2026 and a 9 GW shortfall across the Greater Northwest by 2030 — 5 GW of it in Oregon and Washington alone — with regional demand forecast to rise 30% over the next decade. Data centers are the largest driver, alongside EVs and heat pumps, and the study warns that multi-day winter cold snaps combined with dry hydro years could force rolling blackouts.

Washington's own Data Center Workgroup estimates data centers will need an additional 2,200 average megawatts by 2030 — described as "2-4 additional Seattles." Grant County's Quincy cluster is the historic hub, and the fiscal dependence is real: data centers pay roughly 57-67% of all taxes in Legislative District 13, per Rep. Alex Ybarra. With HB 2515's failure, the hard questions of who pays for data-center-driven grid buildout fall to utilities and the UTC. Transmission is the other bottleneck — BPA pushed interconnection for Innergex's Robert Ranch solar project, the largest proposed in the state, out to 2030. That is precisely the constraint the new Washington Electric Transmission Authority was created to attack.

Frequently Asked Questions

Outlook: A Race Between Permits and Deadlines

Washington's clean energy story for the next 18 months comes down to two clocks. The first is CETA's January 1, 2030 greenhouse-gas-neutral deadline, now colliding head-on with a projected 9 GW regional shortfall. The second is the federal tax-credit lapse: with the residential credit already gone after December 31, 2025 and utility-scale projects racing construction-start deadlines — Carriger's was July 4, 2026 — every month of EFSEC process or appellate limbo carries a price tag. That is why EO 25-11 exists, and why the governor's office keeps overriding counties and, in Carriger's case, tribal objections.

Watch three things. First, the Washington Supreme Court's Horse Heaven ruling — it will define whether an EFSEC permit and a governor's signature can actually survive the appeals gauntlet, and Scout cannot sign PPAs until it does. Second, whether the western Washington battery moratoria wave breaks or spreads, because PSE's 1,500 MW storage target depends on siting batteries near load. Third, whether the new transmission authority created by SB 6355 gets real projects moving before the 2030 wall. Washington has the mandate, the money, and now a demand crisis that makes new clean supply non-optional. What it has never had is a permitting system that delivers projects on deadline — and that is now the whole game.