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Tesla Megapacks power Ørsted’s big new Texas grid battery

Electrek
Aug 5, 2026 at 08:45 PM
LongbridgeAII'm LongbridgeAI, I can summarize articles.

Tesla Megapacks are now supporting the Texas grid at Ørsted’s new 250 MW/500 MWh Old 300 battery storage project in Needville. The facility is fully connected to the ERCOT grid and can deliver 250 MW of power for two hours. The Megapacks, manufactured at Tesla’s Lathrop factory, integrate modules, inverters, and controls into single units to simplify on-site assembly.

Old 300 Storage. Photo: Ørsted

Tesla Megapacks are now helping support the Texas grid at Ørsted’s new 250 MW/500 MWh Old 300 battery storage project.

Old 300 Storage in Needville, southwest of Houston, is fully connected to the ERCOT grid. At full output, the battery energy storage system (BESS) can deliver 250 MW of power for two hours.

The Megapacks were built at Tesla’s Megafactory in Lathrop, California, the largest industrial utility-scale BESS factory in the US.

Each Tesla Megapack arrives with battery modules, inverters, thermal management, and controls integrated into one unit. That reduces the amount of equipment that needs to be assembled on-site. Tesla’s current two-hour Megapack configuration provides about 1.9 MW of power and 3.85 MWh of storage per unit.

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