# TransAlta Centralia Generation

BPA asset profile · https://askthegrid.com/assets/facilities/transalta-centralia-generation

TransAlta Centralia Generation LLC - Lewis County - BPAT

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.

## Metrics

- **Nameplate capacity:** 729.9 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 3845 — plant-3845

## Facts

- **Technology:** Conventional Steam Coal
- **Operator:** TransAlta Centralia Generation LLC
- **Unit 1 retirement:** 2020-12-31 · confidence: high

## Related parties

- **Owner / operator:** TransAlta Centralia Generation LLC — Owner and operator ([source](https://transalta.com/our-operations/facilities/centralia))
- **Parent company:** TransAlta Corporation — Indirect parent and ultimate acquirer ([source](https://transalta.com/))
- **Parent company:** TECWA Power Inc. — Direct parent of TransAlta Centralia Generation LLC
- **Offtaker:** Puget Sound Energy, Inc. — Tolling-agreement counterparty and contracted recipient of converted facility capacity and energy ([source](https://www.pse.com/))
- **Balancing authority:** Gridforce Energy Management, LLC — Designated Balancing Authority under DOE emergency order
- **Former owner:** Puget Sound Energy (former co-owner) — Former 7.0% owner and later tolling-agreement counterparty

## Sources

- [apps.ecology.wa.gov](https://apps.ecology.wa.gov/cleanupsearch/site/17302) — apps.ecology.wa.gov · authoritative — Source retained for exact-record publication review.
- [docs.cpuc.ca.gov](https://docs.cpuc.ca.gov/published/Final_decision/39680-02.htm) — docs.cpuc.ca.gov · authoritative — Source retained for exact-record publication review.
- [en.wikipedia.org](https://en.wikipedia.org/wiki/Centralia_Power_Plant) — en.wikipedia.org · public_source — Source retained for exact-record publication review.
- [transalta.com](https://transalta.com/newsroom/transalta-signs-long-term-agreement-for-700-mw-at-centralia-facility-enabling-coal-to-natural-gas-conversion) — transalta.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/transalta-centralia-generation
Website: [TransAlta Corporation](https://transalta.com/our-operations/facilities/centralia)

Source: Ask the Grid — https://askthegrid.com/