Intersect Power has signed a contract with Tesla for 15.3 gigawatt-hours (GWh) of Tesla’s Megapack battery energy storage system for the clean energy company’s project portfolio through 2030.

Serving as a backup power source for intermittent renewables, energy storage system usage has taken off in the U.S. along with the rise of solar power generation. The U.S. Energy Information Administration (EIA) forecasts battery storage capacity will nearly double, adding about 14 GW of battery storage to the existing 15 GW this year if developers’ plans pan out.

On July 18, Intersect said it plans to use half of the latest Tesla Megapack order for four projects expected to begin operations in California and Texas by the end of 2027. The rest will be used for solar and energy storage projects scheduled to come online in 2028-2030.

“This partnership is the foundation of one of the largest and fastest growing storage portfolios in the country here at Intersect Power,” said Intersect Power CEO Sheldon Kimber. “This storage franchise is the perfect complement to our multibillion-dollar expansion of renewable generation that is expected to more than triple the size of our company over the next three years.”

Intersect Power said it currently has 2.4 GWh of Tesla Megapacks in operation or under construction. The company is installing an additional 1 GWh of Tesla Megapacks at its Radian and Lumina solar and storage facilities in Texas, which the company said will be fully operational within the year.