Thousands of electric vehicles in Waymo’s autonomous robotaxi fleet may eventually give up their used batteries for a very different purpose—contributing up to hundreds of megawatt-hours of stationary energy storage to local power grids.

That prospect comes from a “strategic supply agreement” announced by Waymo and B2U Storage Solutions on June 4. B2U has been repurposing thousands of used batteries from various electric vehicles by installing them in large stationary energy storage projects. Such energy storage facilities can capture excess renewable energy during low demand periods and release such energy when local power grids are experiencing peak demand periods.

“Our business is getting the full residual value out of electric vehicle batteries after they're no longer suitable for automotive use,” Freeman Hall, CEO of B2U Storage Solution, told Ars. “Waymo puts a lot of miles on EVs and their model is expanding rapidly, and so we're just very pleased and honored to be able to work with them.”

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Tesla announced today that its unsupervised “Robotaxi” service now covers the entire Austin metro area, a significant expansion of its geofenced operating zone.

It’s a notable milestone on paper, but the actual fleet serving this massive area remains tiny — just ~20 active unsupervised vehicles, according to the latest data, a number that has actually been shrinking.

On today’s exciting episode of Quick Charge, we’re exploring the industry’s backlash – real or imagined – towards Elon Musk’s SpaceX merger talks, Full Self Driving’s staff revolt, and even large, utility scale solar projects. All this and more when you hit that play button!

Waymo is beginning to offer select riders trips in its new purpose-built Ojai robotaxi, debuting the company’s 6th-generation Driver hardware across San Francisco, Los Angeles, and Phoenix. Trips will be free for a limited time.

The Ojai represents a significant step for Waymo, which has now surpassed 20 million fully autonomous trips across 11 cities — a scale that no competitor comes close to matching.