Transalta Centralia Generation
TransAlta CorporationLewis County
TransAlta Centralia is a 729.9 MW conventional steam coal plant in Lewis County, Washington. TransAlta Centralia Generation LLC, a subsidiary of Calgary-based TransAlta Corporation, owns and operates the plant's single remaining generator, Unit 2. TransAlta retired the plant's original Unit 1, a 670 MW boiler, at the end of 2020 under a 2011 Washington law that also required Unit 2 to stop burning coal by the end of 2025. Unit 2's coal-fired retirement date passed on schedule, but the U.S. Separately, TransAlta and Puget Sound Energy signed a tolling agreement in December 2025 to convert Unit 2 from coal to a 700 MW natural-gas facility that would operate under contract until 2044, with commercial gas operation targeted for late 2028.
EIA plant 3845 · Inventory reporting month unavailable.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 2 | Conventional Steam Coal | Operating | 729.9 | Unknown |
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Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 2 | 729.9 MW 670 MW summer | Conventional Steam Coal ST | Jul 1973 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
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Project milestones and public references behind the asset profile.
Power plant construction began in 1968.
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Transalta Centralia GenerationCurrent | 729.9 MW | WA | |
| Skookumchuck | 1 MW | WA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator 2 with this operating date.
TransAlta and Puget Sound Energy announced a power purchase agreement for coal-transition power from Centralia. PSE selected TransAlta through an RFP process evaluating it against more than 30 competing alternatives. Deliveries began December 2014 at 180 MW, increased to 280 MW within 12 months, held at 380 MW from December 2016 through 2024, and dropped to 300 MW in the final contract year through 2025.
Unit 1 was retired, leaving Unit 2 as the facility's remaining coal-fired generation unit.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Transalta Centralia Generation reports 729.9 MW coal of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Form 860M.
Transalta Centralia Generation is a Conventional Steam Coal facility in Lewis County, WA, participating in the BPA market.
Transalta Centralia Generation is in Lewis County, WA, inside the BPA balancing area.
Transalta Centralia Generation is operated by TransAlta Centralia Gen LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Transalta Centralia Generation reported 1,223.8 GWh over the twelve months to 2026-08. Figures are net generation as filed to EIA-923.
By capacity, Transalta Centralia Generation ranks #95 of 205 operating plants of the same technology nationally. It ranks #1 of 1 in WA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.