Tesla

Megablock

In Development

Utility-scale integrated energy storage solution unveiled in September 2025. Combines up to 4 Megapack 3 units with a transformer and switchgear into a single 20 MWh AC system. Achieves 23% faster installation and up to 40% lower construction costs compared to traditional deployments. 248 MWh per acre density; can deploy 1 GWh in 20 business days. 25-year / 10,000-cycle life. To be manufactured at the Houston Megafactory.

Latest update Aug 10, 2026

Megablock

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Current status

Unveiled September 2025. The Houston/Brookshire Megafactory began producing its sibling Megapack 3 unit on August 6, 2026, but Megablock production had not yet started as of early August 2026, with no updated date beyond Tesla's prior late-2026 target.

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Specifications3

Capacity
20 MWh AC per Megablock
Round-Trip Efficiency
91%
Deployment Speed
1 GWh in 20 business days

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Upcoming milestones1

Announced next steps from Tesla that mention Megablock.

  1. Late 2026

    Stand up Megablock production at the Houston/Brookshire Megafactory

    Megapack 3 production began at the Brookshire/Houston Megafactory on August 6, 2026, about 16 months after groundbreaking and ahead of Tesla's late-2026 target, with the plant designed for 50 GWh/year of Megapack 3 output. Energy-Storage.News reporting dated September 4, 2026 still says Megapack 3 customer deliveries are expected toward the end of 2026 and treats Megablock as the pre-engineered four-pack configuration (about 20 MWh with transformer and switchgear), not as a separate line that has started production. Tesla has not given an updated Megablock production date beyond its prior late-2026 target.

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