Projects coming online are generating returns of around 20%, compared with single digit returns for solar and wind projects, according to Rhett Bennett, CEO of Black Mountain Energy Storage, one of the top developers in the state.
"Resolving grid issues with utility-scale energy storage is probably the hottest thing out there,” he said.
The rapid expansion of battery storage could help prevent a repeat of the February 2021 ice storm and grid collapse which killed 246 people and left millions of Texans without power for days.
The battery rush also puts the Republican-controlled state at the forefront of President Joe Biden's push to expand renewable energy use.
Power prices in Texas can swing from highs of about $90 per megawatt hour (MWh) on a normal summer day to nearly $3,000 per MWh when demand surges on a day with less wind power, according to a simulation by the federal government's U.S. Energy Information Administration.
That volatility, a product of demand and higher reliance on intermittent wind and solar energy, has fueled a rush to install battery plants that store electricity when it is cheap and abundant and sell when supplies tighten and prices soar.
Texas last year accounted for 31% of new U.S. grid-scale energy storage, according to energy research firm Wood Mackenzie, second only to California which has had a state mandate for battery development for a decade.
And Texas is expected to account for nearly a quarter of the U.S. grid-scale storage market over the next five years, according to Wood Mackenzie projections shared with Reuters.
Developers and energy traders said locations offering the highest returns -- in strapped areas of the grid -- will become increasingly scarce as more storage comes online and electricity prices stabilize.
Texas lawmakers this week voted to provide new subsidies for natural gas power plants in a bid to shore up reliability. But the legislation also contains provisions that industry groups said could encourage investment in battery storage.
Amid the battery rush, BlackRock acquired developer Jupiter Power from private equity firm EnCap Investments late last year. Korea's SK E&S acquired Key Capture Energy from Vision Ridge Partners in 2021 and UBS bought five Texas projects from Black Mountain last year for a combined 700 megawatts (MW) of energy storage. None of the sales' prices were disclosed.
SK E&S said its acquisition of Key Capture was part of a strategy to invest in U.S. grid resiliency.
"SK E&S views energy storage solutions in Texas and across the U.S. as a core technology that supports a new energy infrastructure system to ensure American homes and businesses have affordable power," the company said in a statement.