Tesla Energy has achieved a significant milestone in Arizona, as one of the largest battery energy storage systems (BESS) in the world has now gone online in Maricopa County. The Maricopa Energy Center, developed by Copia Power, features a massive 550 MW solar project paired with 2,200 MWh of battery storage, powered by a total of 594 Tesla Megapacks.
In a recent LinkedIn update, Copia Power shared that all 594 Tesla Megapacks have been successfully installed in the BESS yard at the Maricopa Energy Center. This deployment is considered one of the largest Megapack installations to date, playing a crucial role in providing flexible, dispatchable power to support grid reliability during peak demand periods. Copia Power expressed gratitude towards Tesla Energy and SOLV Energy for their collaboration and execution on this complex project.
The Maricopa battery system, valued at approximately $560 million, is primarily designed to enhance grid reliability rather than solely serving as an energy arbitrage or peaker plant. With a capacity of around 2.3 GWh, this installation positions Arizona as a key player in the global landscape of large-scale energy storage. As utilities increasingly turn to batteries to stabilize grids facing growing demand and the integration of renewable energy sources, projects like the Maricopa Energy Center are crucial.
Tesla’s Megapack is a utility-grade energy storage solution specifically designed for grid-scale applications. Each Megapack unit is capable of storing large amounts of energy and quickly dispatching it back to the grid as needed, aiding in the management of demand spikes and the integration of intermittent renewable sources like solar and wind. The Megapack has become a staple in large battery projects worldwide, particularly in North America and Australia, including recent deployments in Canada and Australia tied to wind farms.
Tesla continues to innovate on the Megapack platform, with the recent unveiling of Megapack 3 and the Megablock system in September. These newer systems promise faster installation, improved efficiency, and enhanced long-term reliability. Tesla has already secured orders for Megablock, with plans for its 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 other regions.
Projects like the Maricopa Energy Center highlight Tesla Energy’s growing importance in grid-scale storage, a critical component of the clean energy transition. As the demand for reliable and sustainable energy solutions continues to rise, Tesla’s innovative technologies are playing a vital role in reshaping the energy landscape for a greener future.

