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Houston clean energy storage facility goes online to power ERCOT grid

Jupiter Power's Callisto I is up and running. Photo courtesy of jupiterpower.io

A new battery energy storage facility in Houston is officially up and running to power the ERCOT grid with a supply of reliable, zero emissions power.

Jupiter Power announced the commercial operations launch of its 400-megawatt-hour battery facility, Callisto I, in central Houston on the site of the former HL&P H.O. Clarke fossil fuel power plant.

"Jupiter couldn't be prouder about bringing the Callisto I project online," Andy Bowman, CEO of Jupiter Power, says in a news release. "This project responds to lawmakers' calls to increase affordable and dispatchable new generation in an area where people need more power. Callisto I is the first energy storage project at this scale in the City of Houston and will help meet Houston's growing power needs while also increasing resiliency from extreme weather events."

The new project is Jupiter Power's ninth project to deliver energy storage to ERCOT — bringing its total ERCOT fleet to 1,375-megawatt-hour capacity — but its the first in the Houston area. The company is currently developing over 11,000 megawatts of projects across the country. Founded in 2017, Jupiter Power is headquartered in Austin and has offices in Houston and Chicago.

"The announcement of Jupiter Power's Callisto I Energy Storage project is significant and exciting for the region, as it's the first large-scale transmission-connected energy storage project in the City of Houston," Jane Stricker, senior vice president at the Greater Houston Partnership and executive director at the Houston Energy Transition Initiative, adds. "This critical project will help address peak power demand and is another great example of our region's leadership in scaling and deploying impactful solutions for an all the above energy future."

Among the company's financial backers is Houston-based EnCap Energy Transition, which invested in Jupiter Power via its Fund II.

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A View From HETI

SunRoper Solar is slated to begin operations in December 2027. Photo courtesy OCI Energy

Crews have broken ground on the forthcoming 347-megawatt direct-current SunRoper Solar project in Wharton County, Texas, that will add capacity to the ERCOT grid.

The solar project, which is slated to begin operations in December 2027, will provide electricity to an undisclosed Fortune 100 company under a long-term power purchase agreement, according to a news release.

San Antonio’s OCI Energy and Israel's Arava Power are developing the project. It's being financed by ING Capital and constructed by Louisiana-based WHC Inc. The project received $394 million in construction financing in February.

"SunRoper demonstrates how strategic partnerships can help meet Texas' growing demand for electricity through investments in critical energy infrastructure," Sabah Bayatli, president of OCI Energy, said in the release.

Project partners, landowners and company executives attended a groundbreaking event for SunRoper on Sept. 1 at the site outside of the Houston metro area. The companies say they are advancing this energy project to strengthen grid reliability and to help deliver affordable power to one of the highest-demand areas in the state.

“WHC is proud to serve as EPC contractor on the SunRoper Solar project, bringing our construction expertise to bear on a facility that will deliver meaningful power to the Houston region,” Randel Badeaux, president of power North America for WHC, added in the news release. “This groundbreaking reflects months of careful planning and coordination with OCI Energy, Arava Power and our project partners, and we look forward to executing a safe, high-quality build through to completion in 2027.”

OCI Energy currently operates several utility-scale solar and battery energy storage system projects outside of the San Antonio area, and has five other projects under construction outside of San Antonio and Waco, with more than 30 under development in Arkansas, Mississippi, Georgia, Colorado and Alberta, Canada. The company also has existing projects in New Jersey and Georgia.

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