Tesla deployed a record 46.7 gigawatt-hours of energy storage in 2025, and the company has told investors it expects to beat that total in 2026 as Megapack orders keep climbing.
What Megapack actually is
Megapack is Tesla’s grid-scale battery product — large, shipping-container-sized units that utilities and power companies install to store electricity and release it when demand spikes. Tesla’s CFO said on the company’s Q1 2026 earnings call that the energy storage business is on track to keep growing through 2026, and analysts tracking deployments reported Tesla Energy revenue up 84% with 43.5 GWh deployed in the prior 12 months. Tesla’s Megapack order book reportedly exceeds $50 billion, a sign that demand from utilities is outrunning what Tesla can currently build.
Why Tesla is building more factories for it
To keep up, Tesla is adding Megapack production beyond its original Lathrop, California plant, including a dedicated Megafactory in Shanghai that roughly doubles global production capacity. Combined with a planned Houston-area facility, Tesla’s total grid-battery manufacturing capacity is on track to reach around 133 GWh a year once all sites are running. None of this changes anything in your car directly, but it’s part of the same company that supplies your Supercharger network and, if you have a Powerwall, your home backup — the more grid-scale storage utilities install, the more stable the grid is during the peak-demand hours when a lot of home charging also happens.
Seeing it deployed
Tesla’s own channel posted this look at a Megapack site on August 25, 2026, showing the units being installed and connected at scale rather than a single demo unit:
This video shows Tesla’s own footage of a Megapack site, not an independent test — for the deployment numbers and order book figures, rely on the earnings-call reporting and analyst tracking linked above, which are updated as new quarters come in.
