Tesla says Cybertruck Powershare now backs up homes with a Powerwall 3

Tesla's Cybertruck can now back up a home together with a Powerwall 3, the company's official Cybertruck account said in a post on X on September 10, 2026: "Powerwall 3 & I can now power your house together. This extends your home backup by over 3 days, equivalent to 9 additional Powerwalls." The post is that caption on a 4-second clip of a Tesla app screen: a home in a "Grid Outage" with "> 24 backup hours remaining" and "Cybertruck is providing backup power," the truck labeled "11.5" at 80%, the "Powerwall" at "9.5 kW" and 19%, solar panels at 1.0 kW, the home at 3.0 kW, the grid at 0 kW, and a "System Power Limit" of "11.5 kW Max." Neither the caption nor the screen names a price or a software version, and the battery on the screen is labeled only "Powerwall."

Until now Powershare could back up a home but not one that already had a Powerwall, according to Electrek's September 10 report, which says owners had to pick one or the other and that the Powerwall 3 now keeps running the house while the truck's pack extends the runtime. Electrek puts the Cybertruck's pack at 123 kWh and a Powerwall at 13.5 kWh, so nine of the latter is close to the truck's pack, and says Powershare pushes up to 11.5 kW into the home, the figure on the post's "System Power Limit" line, and needs a Universal Wall Connector and a Powershare Gateway.

The pairing arrives late by Tesla's own calendar. A Tesla update to owners in October 2024 said that "For Powerwall owners, Powershare will be enabled in 2025," as Electrek reported at the time. A Tesla email to customers that Drive Tesla published on December 12, 2025 said the feature "is still in development and is now scheduled for release in mid-2026," and in Drive Tesla's account Cybertruck lead engineer Wes Morrill explained on X that "Two grid forming devices need to negotiate who will form and who will follow depending on state of charge of each."

Tesla vehicles were already on the vehicle list of PG&E's bidirectional pilot, which pays up to $4,500 per home, when PG&E expanded it in August 2026.