Image: Tesla
Tesla Energy has hit another major milestone in Arizona, with one of the largest battery energy storage systems (BESS) in the world now coming online in Maricopa County. According to Copia Power, its Maricopa Energy Center pairs a massive 550 MW solar project with 2,200 MWh of battery storage, powered by a staggering 594 Tesla Megapacks.
In a LinkedIn update, Copia Power said the Maricopa Energy Center “continues to take shape,” confirming that all 594 Tesla Megapacks have now been installed in the BESS yard. The company called it one of the largest Megapack deployments to date, noting that the system will play a critical role in delivering “flexible, dispatchable power” to support grid reliability when demand is highest. Copia also thanked Tesla Energy and SOLV Energy for their execution and collaboration on the complex project.
Valued at roughly $560 million, the Maricopa battery system is designed primarily to boost grid reliability rather than act purely as an energy arbitrage or peaker plant. At roughly 2.3 GWh of capacity, the installation places Arizona firmly on the global map for large-scale energy storage, as utilities increasingly look to batteries to stabilize grids strained by rising demand and renewable energy adoption.
Tesla’s Megapack is the company’s flagship utility-grade energy storage solution, built specifically for grid-scale applications. Each unit can store enormous amounts of energy and rapidly dispatch it back to the grid when needed, helping smooth out demand spikes and better integrate intermittent renewable sources like solar and wind. That formula has made Megapack a staple of large battery projects across the globe — especially in North America and Australia, including a recent $90 million BESS that went live in Canada and major deployments tied to wind farms in Australia.
Tesla continues to iterate on the platform as well. In September, the company unveiled Megapack 3 and its even larger Megablock system, promising faster installation, improved efficiency, and greater long-term reliability. Tesla has already secured orders for Megablock, with the technology set to debut at a $220 million battery project in Australia, alongside a growing list of large Megapack deals in the U.K., U.S., Australia, and beyond.
With projects like Maricopa, Tesla Energy is quietly becoming one of the most important players in grid-scale storage — an increasingly critical piece of the clean energy transition.
