Lunar and Sunrun: turning home batteries into America's largest residential VPP

Sunrun, the largest solar and battery installer in the US, needed a technology partner to run its growing fleet of home batteries as a single, coordinated grid resource. Lunar became that partner, operating Sunrun's Virtual Power Plants nationwide.

The challenge

Sunrun had tens of thousands of home batteries installed across the US and a growing list of utility commitments to meet. But delivering virtual power plant services across multiple states, utilities, OEMS, and market rules, they needed every battery to respond at the right moment, deliver the right amount of power, and leave the customer better off for participating. Doing that at scale, reliably, day after day, requires the right platform.

‍The solution

That's exactly what Lunar delivered. Lunar's Gridshare Platform connects to Sunrun's fleet, spanning devices from multiple manufacturers, and turns it into something utilities can actually count on: a coordinated virtual power plant that responds to grid signals in real time across multiple US territories and regulatory environments.

Our technology handles everything behind the scenes. It monitors every device in the fleet, forecasts available capacity a day ahead, builds optimised dispatch plans, and executes them automatically. When a utility sends a signal, the fleet responds. When the event ends, devices return to optimizing for the customer.

The results

Since 2022, we have operated some of the largest residential VPPs in the US — including programs for PG&E, National Grid, and Eversource. To date, we have delivered:

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What's next

The US energy market is moving fast. New VPP programs are coming online, more states are opening up, and the value of a well-managed residential fleet is only going to grow. Lunar’s technology is already built for what comes next — more programs, more devices, more markets, all handled automatically, in the US and globally.

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