# Sweeny Cogen Facility

ERCOT asset profile · https://askthegrid.com/assets/facilities/sweeny-cogen-facility

Phillips 66 · Brazoria County · ERCOT

Sweeny Cogen Facility is a four-unit natural-gas cogeneration plant beside Phillips 66's Sweeny refinery in Brazoria County, Texas. EIA's May 2026 inventory reports 572 MW nameplate, 436 MW net summer, and 504 MW net winter capability. Three turbines entered service in 1997 and the fourth in December 2000. Phillips 66 increased its ownership to 100% in 2014; its current subsidiary list includes Sweeny Cogeneration LLC. The facility supplies electricity and process steam to the refinery and exports merchant power into ERCOT.

## Profile

- **Grid role:** Industrial cogeneration supplying refinery steam and electricity while exporting merchant power to ERCOT.
- **Operating configuration:** Four operating natural-gas combustion turbines at 143 MW nameplate each.
- **Capacity scope:** EIA reports 572 MW nameplate, 436 MW net summer, and 504 MW net winter capability; Phillips 66 historically used a 440 MW net-output rating.
- **Current ownership:** Phillips 66 increased its ownership to 100% in 2014 and currently lists Sweeny Cogeneration LLC as a subsidiary.

## Metrics

- **Net summer capacity:** 436 MW — EIA May 2026
- **Nameplate capacity:** 572 MW — EIA May 2026
- **Net winter capacity:** 504 MW — EIA May 2026
- **Operating generators:** 4 — 143 MW nameplate each
- **Current owner:** Phillips 66 — 100% since 2014
- **Registry anchor:** Plant 55015 — Sweeny Cogeneration LLC

## Facts

- **Net summer capacity:** 436 MW — EIA May 2026 · confidence: high
- **Nameplate capacity:** 572 MW — EIA May 2026 · confidence: high
- **Net winter capacity:** 504 MW — EIA May 2026 · confidence: high
- **Current owner:** Phillips 66 — 100% ownership since 2014 · confidence: high
- **Industrial use:** Power and process steam for Sweeny refinery — Phillips 66 filing · confidence: high

## Related parties

- **Registered project company:** Sweeny Cogeneration LLC — EIA May 2026 generator inventory

## Sources

- [EIA May 2026 generator inventory](https://www.eia.gov/electricity/data/eia860m/) — U.S. Energy Information Administration · regulatory — Current generator records, capacity scopes, dates, status, operator, and technology.

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Canonical page: https://askthegrid.com/assets/facilities/sweeny-cogen-facility
Website: [Phillips 66](https://www.phillips66.com/refining/sweeny-refinery/)
Profile published: 2026-07-17T03:34:51.499Z
Source: Ask the Grid — https://askthegrid.com/