# Mark One Power Station

ERCOT asset profile · https://askthegrid.com/assets/facilities/mark-one-power-station

CPS Energy - Brazoria County - ERCOT

Mark One Power Station is an operating natural-gas-fired peaking station near Angleton in Brazoria County, Texas, within the ERCOT market. The facility comprises eight GE LM6000 aeroderivative combustion turbine generators (CTG-1 through CTG-8), each rated at 60.5 MW nameplate capacity, totaling approximately 484 MW. Originally developed and owned by WattBridge Energy LLC, it was constructed by PROENERGY Services from 2021 to 2023, with the initial six units commissioned in early 2023 and CTG-7 and CTG-8 entering operation in 2024. The station is interconnected at 138 kV to the CenterPoint Energy Houston Electric transmission system and delivers fast-start, reduced-emissions peaking power to support grid reliability and renewable integration. CPS Energy (City Public Service of San Antonio) acquired the facility on September 24, 2025, as part of a four-plant portfolio purchase from PROENERGY; PROENERGY continues to operate and maintain the station under service agreements.

## Metrics

- **Nameplate capacity:** 484 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 65372 — plant-65372

## Facts

- **Technology:** Natural Gas Fired Combustion Turbine
- **Operator:** City of San Antonio - (TX)

## Related parties

- **Owner / acquirer:** CPS Energy — Current facility owner and operator through continuing PROENERGY O&M agreements. ([source](https://www.cpsenergy.com/))
- **Seller / EPC contractor / O&M provider:** PROENERGY — Plant equipment supplier, EPC contractor, commissioning agent, and operator throughout project life. Provided turnkey PowerFLX plant solution. ([source](https://www.proenergyservices.com/))
- **Lender:** MUFG Union Bank, N.A. — Project financier for Mark One facility.
- **Lender:** CoBank ACB — Project financier for Mark One facility. ([source](https://www.cobank.com/))
- **Lender:** Truist Bank — Project financier for Mark One facility. ([source](https://www.truist.com/))
- **Fuel supplier:** Enbridge Brazoria Interconnector Gas Pipeline, LLC — Gas transmission service provider. ([source](https://www.enbridge.com/))
- **Fuel supplier:** Enbridge Texas Eastern Transmission, LP — Gas transmission service provider. ([source](https://www.enbridge.com/))
- **Fuel supplier:** ConocoPhillips Company — Natural gas supplier for Mark One. ([source](https://www.conocophillips.com/))
- **Interconnection counterparty / transmission owner:** CenterPoint Energy Houston Electric, LLC — Transmission service provider and owner of interconnection facilities. ([source](https://www.centerpointenergy.com/))
- **Parent company:** ACON Investments — Historical 50% parent ownership participant in WattBridge Energy LLC. ([source](https://aconinvestments.com/))
- **Parent company:** Bridgepoint Group PLC — Historical 25% parent ownership participant in WattBridge Energy LLC. ([source](https://www.bridgepointgroup.com/))
- **Parent company / investor:** Energy Capital Partners Management LP — Historical 25% parent ownership participant in WattBridge Energy LLC; later acquired majority stake in PROENERGY in August 2024. ([source](https://www.ecpgp.com/))
- **Equipment supplier:** GE Vernova — OEM for LM6000 aeroderivative combustion turbine units. ([source](https://www.gevernova.com/))

## Sources

- [mbrweb.ferc.gov](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=861) — mbrweb.ferc.gov · authoritative — Source retained for exact-record publication review.
- [newsroom.cpsenergy.com](https://newsroom.cpsenergy.com/cps-energy-closes-on-previously-announced-acquisition-of-1632-megawatt-power-generation-portfolio-in-southeast-texas/) — newsroom.cpsenergy.com · public_source — Source retained for exact-record publication review.
- [newsroom.cpsenergy.com](https://newsroom.cpsenergy.com/cps-energy-enters-agreement-with-proenergy-to-acquire-1632-megawatt-power-generation-portfolio-in-southeast-texas/) — newsroom.cpsenergy.com · public_source — Source retained for exact-record publication review.
- [gem.wiki](https://www.gem.wiki/Mark_One_power_station) — gem.wiki · public_source — Source retained for exact-record publication review.
- [gevernova.com](https://www.gevernova.com/gas-power/products/gas-turbines/lm6000) — gevernova.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/mark-one-power-station
Website: [CPS Energy](https://www.cpsenergy.com/)

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