# J K Spruce

ERCOT asset profile · https://askthegrid.com/assets/facilities/j-k-spruce

CPS Energy · Bexar County · ERCOT

J.K. Spruce is CPS Energy's two-unit coal plant at Calaveras Lake in Bexar County, registered as EIA Plant ID 7097. EIA's May 2026 inventory lists 1,488.5 MW of nameplate capacity and 1,345 MW of net summer and winter capability. ERCOT maps the units to resources CALAVERS_JKS1 and CALAVERS_JKS2 and settlement points CALAVER_JKS1 and CALAVER_JKS2. CPS Energy approved Spruce 1 to cease operation in December 2028 and plans to convert Spruce 2 to natural gas; its January 2026 financial disclosure targets conversion by the end of 2027, while ERCOT's May 2025 resource plan models gas operation beginning June 1, 2028.

## Profile

- **ERCOT configuration:** Two South-zone coal resources, CALAVERS_JKS1 and CALAVERS_JKS2, mapped to the CALAVERS resource node.
- **Operating role:** CPS Energy reports 560 MW for Spruce 1 and 785 MW for Spruce 2; both units are normally base loaded.
- **Transition plan:** Spruce 1 is approved to cease operation in December 2028. Spruce 2 is planned for conversion to natural gas, with CPS and ERCOT currently publishing different transition dates.

## Metrics

- **Net summer capability:** 1,345 MW — Spruce 1: 560 MW · Spruce 2: 785 MW.
- **Nameplate capacity:** 1,488.5 MW — Two operating EIA generators.
- **Technology:** Conventional steam coal — Two pulverized-coal units.
- **Registry anchor:** Plant 7097 — City of San Antonio · Bexar County
- **Resource node:** CALAVERS — CALAVERAS substation · ERCOT.
- **Resource stack:** 2 resources — CALAVERS_JKS1 · CALAVERS_JKS2

## Facts

- **Net summer / winter:** 1,345 / 1,345 MW — EIA May 2026 · confidence: high
- **Owner / operator:** CPS Energy — City of San Antonio municipal utility · confidence: high
- **Settlement points:** CALAVER_JKS1 · CALAVER_JKS2 — ERCOT resource-node mapping · confidence: high
- **Operating dates:** 1992 / 2010 — Spruce 1 / Spruce 2 · confidence: high
- **Coordinate parcel:** 336866 — 7,484.61 acres · City of San Antonio · confidence: high

## Sources

- [EIA May 2026 inventory](https://www.eia.gov/electricity/data/eia860m/) — U.S. Energy Information Administration · regulatory — Generator status, capacity, operating dates, and Spruce 1 retirement date.

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Canonical page: https://askthegrid.com/assets/facilities/j-k-spruce
Website: [CPS Energy](https://cpsenergy.com/)
Profile published: 2026-07-17T03:34:27.013Z
Source: Ask the Grid — https://askthegrid.com/