Tesla

Megapack

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Utility-scale battery energy storage system. Current Megapack stores up to 3.9 MWh; next-gen Megapack 3 stores 5 MWh per unit and entered production in August 2026. Deployed worldwide for grid storage, renewable energy integration, and peak demand management. Tesla deployed a record 46.7 GWh of energy storage in 2025 (up 49% YoY), generating $12.8B in energy revenue. Three Megafactories: Lathrop, CA (operational); Shanghai (operational since Feb 2025); Brookshire/Houston, TX (Megapack 3 production began Aug 6, 2026, 50 GWh/year design capacity).

Latest update Aug 10, 2026

Megapack

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Current status

In production at Lathrop Megafactory since 2022 (40 GWh/year). Shanghai Megafactory operational since February 2025 (10,000 units/year, 1,000th unit produced within 6 months, first exports to Australia). The Brookshire/Houston Megafactory began producing Megapack 3 on August 6, 2026, about 16 months after groundbreaking, with a 50 GWh/year design capacity; Megablock production at the same site has not yet started. Total planned capacity: ~133 GWh/year. Tesla is also diversifying Megapack cell sourcing away from CATL and BYD: a $4.3B, three-year deal confirmed by the US government in March 2026 has LG Energy Solution build a Lansing, Michigan plant to supply LFP prismatic cells for Megapack 3 starting August 2027.

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Specifications3

Capacity per Unit
3.9 MWh (current); 5 MWh (Megapack 3)
2025 Total Deployed
46.7 GWh (up 49% YoY)
Energy Revenue (2025)
$12.8B (up 27% YoY, ~30% gross margin)

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Upcoming milestones2

Announced next steps from Tesla that mention Megapack.

  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.

  2. Aug 2027

    Bring LG Energy Solution's Lansing, Michigan LFP cells online for Megapack 3

    A $4.3B, three-year supply agreement confirmed by the US government in March 2026 has LG Energy Solution build a new plant in Lansing, Michigan to supply LFP prismatic cells for Megapack 3, diversifying Tesla's cell sourcing away from CATL and BYD toward domestic, non-Chinese supply as the Houston Megafactory's Megapack 3 line ramps. LG Energy Solution began production at the Lansing plant on August 18, 2026 - a former GM Ultium Cells joint-venture site LG took full ownership of in 2025 - but the dedicated Megapack 3 LFP-cell deliveries under the Tesla supply agreement are still slated to run August 2027 through July 2030, so the plant opening is a step toward the target rather than its completion. No later public update has moved that August 2027 start as of mid-September 2026.

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In the news1

  1. Tesla starts Megapack 3 output at new 50 GWh Texas plant

    Tesla's energy division began producing Megapack 3 batteries on August 6 at a new Megafactory in Brookshire, Texas, going from groundbreaking to operation in about 16 months. The plant is designed for 50 gigawatt-hours of annual Megapack 3 capacity, with each unit storing about 5 MWh, roughly 28% more than the prior Megapack 2 XL, adding a third production site alongside Tesla's Lathrop and Shanghai megafactories as storage deployments grow faster than vehicle deliveries.

    Electrek Benzinga

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