AUSTIN, Texas — Tesla Megapacks are now helping hold up the Texas grid, powering Orsted's newly energized 250 MW/500 MWh Old 300 battery storage project southwest of Houston.
Old 300 Storage, in Needville, is fully connected to the ERCOT grid and can deliver 250 megawatts of power for two hours at full output. The Megapacks were built at Tesla's Megafactory in Lathrop, California, and Electrek reported that the project adds another 500 MWh to Tesla's fast-growing stationary storage business.
Grid Muscle Where Texas Needs It
Each Tesla Megapack arrives with battery modules, inverters, thermal management, and controls integrated into a single unit, which sharply reduces the equipment that has to be assembled on site. Tesla's current two-hour configuration delivers roughly 1.9 MW and 3.85 MWh per unit.
That plug-and-play design matters in Texas, where demand keeps climbing and extreme weather can tighten the balance between supply and use in a hurry. Batteries like Old 300 can charge when power is cheap and plentiful, then discharge when the grid is stretched, while also providing voltage and frequency services that keep the system stable. It is the same manufacturing-first approach that just carried Tesla's Megapack 3 into production in Brookshire, where factory-integrated hardware is speeding up deployments.
