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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

Pelican Energy Partners has made its second nuclear-related acquisition of 2026. Photo via Pexels

Houston-based private equity firm Pelican Energy Partners has acquired California-based Veridiam for an undisclosed amount in an effort to further increase the firm’s focus on the nuclear energy sector.

Veridiam is a strategic manufacturer that specializes in the precision fabrication of components and assemblies made from exotic metals or advanced alloys for the nuclear, aerospace, defense, space and medical fields.

Following the acquisition, Veridiam will continue to operate under its existing name and will led by its current management team, including CEO Brian Joyal.

“Joining the Pelican platform accelerates our strategic trajectory," Joyal said in a news release. "With Pelican's support, we will accelerate the modernization and expansion of our manufacturing capabilities to meet unprecedented demand across the nuclear, aerospace, defense, and medical sectors. This partnership also enables us to expand our portfolio of mission-critical products and engineered solutions while maintaining the uncompromising quality, precision, and reliability standards that have defined Veridiam for more than 60 years."

Since 2011, Pelican has raised over $1 billion in committed capital and has realized over 15 investments. Currently, Pelican is investing from its fourth fund, which aims to support and advance companies that provide critical services and products to the nuclear power industry.

In 2024, Pelican raised a $450 million fund to invest in nuclear energy services and equipment companies.

The Veridiam deal comes after Pelican has completed several nuclear acquisitions. The PE firm acquired New Hampshire-based Environmental Alternatives Inc., which provides nuclear decontamination services, in April; it acquired Georgia-based WSI Welding Solution in December, which services the nuclear sector.

"Veridiam sits at the center of our investment thesis and reflects the kind of deal Pelican does best," Mike Scott, managing partner and founder of Pelican Energy Partners, added in the news release. "With the right capital and operating support, we see a clear opportunity to strengthen the business, invest in its capabilities, and create long-term value for customers and shareholders."

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