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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

CenterPoint has committed to "the largest investment in Greater Houston infrastructure in the company's nearly 160-year history." Photo via Getty Images

CenterPoint Energy disclosed that it's completed its core resiliency actions first phase of its Greater Houston Resiliency Initiative. The company also reports that it's outlined extra upcoming efforts.

Following the unprecedented outages of Hurricane Beryl, CenterPoint outlined its GHRI in August. As of last week, the first phase, which included more than 40 critical actions in total to strengthen the electric grid, has been completed ahead of schedule.

The company also announced a second phase of GHRI and approximately $5 billion in resiliency investment from 2026 to 2028, a figure that's around twice as much as initially promised.

"We have heard the call to action from our customers and elected officials, and we are responding with bold actions," says Jason Wells, CenterPoint president and CEO, in a statement. "Our defining goal, going forward, is this: to build the most resilient coastal grid in the country that can better withstand the extreme weather of the future. To achieve this ambition, we will undertake a historic level of resiliency actions and investment, because this is what the people of the Greater Houston area expect and deserve."

According to CenterPoint, the second phase will include system hardening, strategic undergrounding, self-healing grid technology, and further enhancements to the company's outage tracker.

CenterPoint outlined its recently completed efforts, including installing over 300 automation devices and more than 1,000 stronger poles, as well as removing hazardous vegetation from more than 2,000 miles of power lines. Next up, CenterPoint says it's near-term actions will include further grid strengthening, public communication improvements, and enhancements to local, community, and emergency partnerships. The details of this phase, which will take place between September 1 to June 1, will be released by September 30.

In the company's longer-term action plan, CenterPoint commits to $5 billion in upgrades from 2026 to 2028 — "the largest investment in Greater Houston infrastructure in the company's nearly 160-year history."

"The mission of this longer-term plan of action is to build the most resilient coastal grid in the country by investing in a smarter grid of the future that can better withstand a broad spectrum of risks," reads the statement. "The proposal, and the entire scope of these actions will be outlined in a new system resiliency plan that is expected to be filed with the Public Utility Commission of Texas on or before January 31, 2025."

CenterPoint reports that lawmakers have received this information directly, and that the plan will be shaped by feedback from its customers, experts, and stakeholders, including elected officials and local agencies.

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