World鈥檚 Largest Battery Facility Gets Bigger

The world鈥檚 largest battery energy storage system just got bigger. Vistra recently completed construction on Phase II of its Moss Landing Energy Storage Facility. The battery system is now storing power and releasing it to California’s grid when needed. The 100-megawatt expansion brings the facility’s total capacity to 400 megawatts/1,600 megawatt-hours.

“This facility provides a solution California desperately needs and this expansion was able to come online at the right time 鈥 as the summer heat intensifies and demand for electricity is at its highest,” said Curt Morgan, chief executive officer at Vistra. “The state’s laudable immense buildout of intermittent renewable power has both lowered emissions and presented a reliability challenge. California produces an excess amount of renewable power during the day while the sun is up, but often struggles to meet demand as the sun goes down. Our Moss Landing battery system helps to fill that reliability gap, storing the excess daytime power so it doesn’t go to waste and then releasing it to the grid when it’s needed most.”

Announced just 15 months ago with construction starting in September 2020, the Phase II expansion project was completed in July 2021, ahead of schedule despite the many challenges presented by the COVID-19 pandemic.

Utilizing technology from LG Energy Solution, Vistra’s enormous lithium-ion battery system is co-located on the site of its existing Moss Landing Power Plant in Monterey County, a site that’s been providing electricity to Californians since 1950.

Morgan continued, “What’s great about this particular site is that it has the space to support even further expansion 鈥 up to 1,500 MW/6,000 MWh 鈥 while responsibly utilizing our existing site infrastructure, including existing transmission lines and grid interconnection. California leads the country in the transition away from fossil fuels and the Moss Landing Energy Storage Facility stands as a model for how batteries can support intermittent renewables to help create a reliable grid of the future.”

Vistra is a market-leader in battery energy storage and in 2020 announced it would spend approximately $5 billion by 2030 in renewable and battery energy storage, including nearly $1 billion of development projects already underway, rotating its generation fleet towards zero-emission technologies. Moss Landing is the flagship project of the company’s carbon-free Vistra Zero portfolio of generation assets.