AUSTIN, Texas — Austin Energy announced on Thursday a historic agreement with Jupiter Power LLC to establish a large-scale battery storage facility, marking the largest battery storage deal in the utility’s 130-year history.

The contract will enable the provision of up to 100 megawatts of electricity, significantly enhancing the reliability and efficiency of the energy supply in Central Texas.

“This battery storage project boosts our grid, but it’s more than an investment in infrastructure — it’s a commitment to a cleaner, more resilient energy future for Austin,” said Mayor Kirk Watson.

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The initiative supports Austin Energy’s goal of achieving 125 megawatts of battery storage by the end of 2027. Battery storage plays a critical role in improving reliability by capturing electricity during periods of low demand and delivering it back to the grid when needed most. This flexibility helps balance the integration of renewable energy sources, reduces reliance on fossil fuels, and improves overall system resilience during extreme weather events.

The agreement, valued at an estimated $14.4 million per year with a term of up to 20 years, totals approximately $288 million.

“This agreement reflects a commitment to modernize the grid and ensure reliable, sustainable energy for Austin Energy customers,” said Stuart Reilly, Austin Energy interim general manager.

Utility-scale battery integration is part of Austin Energy’s Resource, Generation and Climate Protection Plan to 2035, which aims to provide a flexible path to a clean energy future. By expanding its portfolio of flexible, dispatchable resources, Austin Energy is building a more adaptable grid capable of supporting renewable growth while ensuring reliability.