Tesla switched on Powershare Home Backup for the Model 3 and Model Y on Oct. 6, letting either car push stored battery energy into a house when the grid goes down. Until then the feature had belonged to the Cybertruck alone, which makes the order-date rules the part of the announcement that matters most to people who already own one of the two cars.
The catch is a Powerwall 3. Electrek reports that the home battery is required, that the car must be plugged into a Wall Connector, and that Tesla guarantees the feature only on cars ordered from Oct. 1, 2026, onward.
Powerwall 3 as the Gate
According to Electrek’s Oct. 6 report, the car cannot power a house on its own. The Model 3 and Model Y have no Powershare Gateway option, the separate hardware that lets a Cybertruck run a home without a Powerwall. Tesla’s Powershare page lists Powerwall 3 as the battery that works today, with Powerwall 2 and Powerwall+ marked “coming soon,” and Tesla’s Powerwall page says compatible Model 3, Model Y and Cybertruck vehicles can connect to a Powerwall to extend backup during an outage.
Electrek puts the maximum continuous output of the Powerwall setup at 11.52 kilowatts. Grid Support, Tesla’s name for selling power back, is not part of the launch.
Which Cars Qualify
Eligibility turns on the order date. Tesla’s footnote says new Model 3 and Model Y vehicles ordered in the United States and Puerto Rico after Oct. 1, 2026 are Powershare-capable, and some earlier cars are as well. Electrek relays Tesla’s wording that “some, but not all” older cars carry the hardware, and says owners can look under Software, then Additional Vehicle Information, for a line reading “Powershare Support.”
Owners who already have a Powerwall 3 and a Wall Connector need no new equipment but must contact Tesla support to have the feature activated, according to the same report. In practice the cars act as an extra battery for the house during an outage and nothing more, with no payment or utility program attached to the energy they supply. The Model S and Model X are excluded, and in Canada the feature remains Cybertruck-only. Electrek’s tally of what is missing is the clearest statement of the catch: no Gateway option, no Grid Support, no Model S or Model X, and no older-car guarantee.
Two Days at 30 Kilowatt-Hours
Tesla’s headline claim is that a Model 3 or Model Y extends home backup by over two days. The company’s footnote bases the estimate on an average U.S. home using 30 kilowatt-hours a day and cautions that real results depend on solar equipment, the vehicle, household energy use and the state of charge when the outage begins. Electrek reports the figure as starting from a 90 percent charge and says standard trims get up to two days, against more than three for the Cybertruck.
The two sources differ slightly on the charge level behind that number. Tesla’s footnote assumes a full battery, while Electrek’s account of the same claim says 90 percent, so the over-two-days figure should be read as a Tesla estimate under assumed conditions and not as a guarantee for any particular house. A household that burns well above 30 kilowatt-hours a day, for example with electric heating or a pool pump, would see the backup window shrink accordingly.
The Cybertruck had its own milestone on Sept. 10, when, Electrek reported, Tesla let its truck back up a house alongside a Powerwall 3 for the first time, pushing up to 11.5 kilowatts from a 123-kilowatt-hour pack. Before that update, the report says, Cybertruck owners had to choose between a Powerwall and Powershare, and Tesla equated the combined setup to nine extra Powerwalls. The Gateway-plus-Universal-Wall-Connector route that Electrek priced at about $4,000 installed remains a Cybertruck option only.
Rivals got there first. Ford’s F-150 Lightning delivers up to 9.6 kilowatts, and Motor1 reports Ford’s claim of up to three days of whole-home power on the 131-kilowatt-hour extended-range pack, a figure that likewise assumes about 30 kilowatt-hours of daily use and requires Sunrun’s Home Integration System. Another Electrek point: a third-party company, Sigenergy, had already enabled vehicle-to-home with Tesla vehicles in 2025 without Tesla’s involvement. Ford’s system, in other words, leans on a third-party installer, while Tesla’s leans on its own home battery and charger, and each approach ties the buyer to a particular piece of hardware before the car can do anything for the house. Electrek adds that GM committed to vehicle-to-home across its Ultium EVs by model year 2026 and that Kia offers it on the EV9 through a Wallbox charger.
Tesla’s delay is part of the record. Drew Baglino, then senior vice president of powertrain and energy engineering, said in 2023 that bidirectional charging could arrive within two years, and Elon Musk remarked that few people would want it without a Powerwall. Electrek’s Fred Lambert reads the Powerwall 3 requirement as possibly designed to protect Powerwall sales, and notes that limiting the launch to new cars leaves many vehicles out.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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