Tesla's Megapack factory in Lathrop, California, is now churning out 200 Megapacks every week — a rate that translates to 10,000 units per year and 40 GWh of utility-scale energy storage capacity annually. The company confirmed the milestone in a new factory video released this week, cementing Lathrop's status as the largest utility-scale battery manufacturing facility in North America.
The Lathrop facility has been operational since 2022 and has scaled aggressively since then. Each Megapack stores 3.9 MWh of energy and delivers 1.9 MW of power, making the weekly output equivalent to roughly 780 MWh of deployable grid storage rolling off the line every seven days. The factory crossed the 10,000th unit milestone in October 2024, and by June 2025 had already produced its 15,000th Megapack 2 XL — a sign of how quickly the production cadence has accelerated.
Lathrop is no longer Tesla Energy's only bet. A second Megafactory in Shanghai began production in Q1 2025, adding another projected 10,000 units — 40 GWh — annually. A third facility is planned for Brookshire, Texas, targeting Megapack 3 production in late 2026 with an anticipated 50 GWh of annual capacity. When all three factories are running at full tilt, Tesla's combined Megapack output could approach 130 GWh per year — a figure that would have seemed implausible just a few years ago.
The timing of the video release, posted through Tesla's recruiting account, signals the company is actively hiring to sustain and expand this output. For the broader grid storage market, the scale Tesla is reaching at Lathrop alone is a meaningful data point: 40 GWh per year from a single North American site puts real pressure on every other player in the utility-scale battery space.
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Sources & reporting notes
The links below identify the material source records used for this report.
- @SawyerMerritt on X (2026-05-01T23:10:08.000Z) — Direct source
- @TeslaRecruiting on X (2026-05-01T23:06:08.000Z) — Direct source
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