Buffalo apartment block installs 3.75 MWh indoor battery

On Thursday, October 15, 2026, battery packs moved along an automation line at Viridi's plant in Buffalo, New York. At the Peace Bridge Place apartments, a 3.75 megawatt-hour lithium-ion battery system will store electricity when it is plentiful and power the building when the grid is strained and power is expensive. The manufacturer and the developer, Good Carbon Co., say it is among the largest battery systems in a US residential building, and it can supply the affordable housing complex for several days.

Large batteries in homes are uncommon for two reasons, cost and fire. Viridi's CEO, Jon M. Williams, put the second one bluntly: "The only thing that has been holding up installations at scale is safety; a lot of the products on the market over the last 10 years have burned things down." Experts say that deploying large batteries that can safely power apartment buildings is an important step in replacing fossil fuels with renewables. The company spent six years and $10 million working on a fireproof container, and half the cost went to batteries it destroyed during testing.

The design rests on isolation. Plates, pouches and spacing keep each battery cell apart, so that when one cell fails its energy dissipates instead of spreading to the next, and, according to Williams, no gas, smoke, heat or fire leaves the container. The hardest check was a forced failure carried out with a cheesecloth draped over the container: the cheesecloth did not char or ignite, according to the test report. Viridi announced in April that it had met Underwriters Laboratories safety standards, which would allow installation indoors without extra fire suppression in the building. Jigar Shah, who led the Department of Energy's Loan Programs Office under the Biden administration, calls the test "near impossible" and says Viridi is the only company to pass it consistently.

For the residents of Peace Bridge Place, the gain is concrete: the building will draw less from the grid when electricity is expensive, and the utility pays it for not drawing and for sending power back when needed, which lowers the complex's overall electricity costs. The system can also run the building during outages. Beyond this building, the stakes are wider. California Energy Commission Chair David Hochschild says batteries help keep the grid reliable, cut pollution and contain costs as demand grows. Shah expects far more US homes to use batteries for backup power by 2030, and says the country could meet much more demand and avoid costly grid upgrades if batteries are placed strategically. Those are forecasts from people who work in the sector, not measured results.

The limits are clear. This is one installation in one building, and the project is designed to show that large batteries can operate safely where people live, a point that will be judged over time in daily operation. The sources give no price for the system and no figure for what residents will save. The fire-safety results come from Viridi's own tests and certification, with the test report and the UL standards cited as the basis, and the question of how the system performs across many installations remains open.