The Tesla Megapack is a large-scale rechargeable lithium-ion battery stationary energy storage product, intended for use at battery storage power stations, manufactured by Tesla Energy, the energy subsidiary of Tesla, Inc. . A 25MW four-hour (100MWh) battery storage project has been connected to the grid by Arizona utility company Salt River Project (SRP). SRP said last week that the project at its Bolster substation is currently the biggest standalone battery energy storage system (BESS) in the southwestern US state. . When Tesla unveiled its next-generation energy storage systems—Megapack 3 and the new Megablock—on September 15, 2025, it marked a pivotal moment in the evolution of utility-scale battery energy storage. 7 GWh in 2025, driving revenue up 26. 8% margins, Tesla plans Megapack 3, Megablock solutions, and over $20 billion in capex for expansions. The system is designed as a modular system where invert- ers and battery racks can be combined up to. .
[PDF Version]
Menu
