# St Clair

MISO asset profile · https://askthegrid.com/assets/facilities/st-clair

DTE Electric Company - St Clair County - MISO

St. Clair Power Plant is a natural gas-fired combustion turbine facility in St. Clair County, Michigan, with 18.5 MW of nameplate capacity from a single generating unit that has been running since May 1968. The site is owned and operated by DTE Electric Company, a subsidiary of DTE Energy. For most of its history the site was far larger: it was a major coal- and oil-fired complex that at its peak supplied nearly 2,000 MW and was, after Unit 7's 1969 completion, briefly the world's largest power plant. DTE retired the plant's coal-fired boilers in December 2022 alongside the utility's Trenton Channel plant, part of a broader push toward carbon-free generation that DTE says has left roughly a third of its electricity coming from carbon-free sources. What remains in service today at the St. Clair site is the small 1968-vintage gas turbine, which continues to run as a peaking unit even though the coal boilers that once dominated the plant are gone. The unit sells into MISO and is settled at DTE-area price nodes near the St. Clair River, such as DECO.BLR1.DEMO.

## Metrics

- **Nameplate capacity:** 18.5 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 1743 — plant-1743

## Facts

- **Technology:** Natural Gas Fired Combustion Turbine
- **Operator:** DTE Electric Company
- **Unit 1 retirement:** 2022-12 · confidence: high
- **Unit 2 retirement:** 2022-12 · confidence: high
- **Unit 3 retirement:** 2022-12 · confidence: high
- **Unit 4 retirement:** 2022-12 · confidence: high
- **Unit 5 retirement:** 2022-12 · confidence: high
- **Unit 6 retirement:** 2022-12 · confidence: high
- **Unit 7 retirement:** 2022-12 · confidence: high

## Related parties

- **Owner / operator:** DTE Electric Company — Owner/operator ([source](https://www.dteenergy.com/us/en/business/about-dte/about-dte/about-dte.html))
- **Parent company:** DTE Energy Company — Parent company ([source](https://www.dteenergy.com/))
- **Balancing authority / market operator:** Midcontinent Independent Transmission System Operator, Inc. (MISO) — Balancing authority and grid operator ([source](https://www.misoenergy.org/meet-miso/about-miso))

## Sources

- [api.eia.gov](https://api.eia.gov/v2/electricity/operating-generator-capacity/data?api_key=DEMO_KEY&data%5B%5D=nameplate-capacity-mw&data%5B%5D=net-summer-capacity-mw&data%5B%5D=net-winter-capacity-mw&facets%5Bplantid%5D%5B%5D=1743&facets%5Bgeneratorid%5D%5B%5D=11&frequency=monthly&start=2026-06&end=2026-06) — api.eia.gov · authoritative — Source retained for exact-record publication review.
- [api.eia.gov](https://api.eia.gov/v2/electricity/operating-generator-capacity/data?api_key=DEMO_KEY&data[0]=nameplate-capacity-mw&data[1]=net-summer-capacity-mw&data[2]=net-winter-capacity-mw&data[3]=operating-year-month&data[4]=planned-retirement-year-month&facets[plantid][]=1743&frequency=monthly&start=2026-06&end=2026-06) — api.eia.gov · authoritative — Source retained for exact-record publication review.
- [mbrweb.ferc.gov](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=93) — mbrweb.ferc.gov · authoritative — Source retained for exact-record publication review.
- [sec.gov](https://www.sec.gov/Archives/edgar/data/28385/000093634026000054/a20251231ex211-subsidiaries.htm) — sec.gov · authoritative — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/st-clair
Website: [DTE Electric Company](https://www.dteenergy.com/us/en/business/about-dte/about-dte/about-dte.html)

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