Sunrun’s 37,000 home batteries are bailing out Puerto Rico’s grid

Sunrun is putting tens of thousands of home batteries to work in Puerto Rico as the island’s electric grid faces a summer of high temperatures and energy shortfalls.

The company says it’s now dispatching energy from over 37,000 residential batteries to help grid operator LUMA keep the lights on. That stored power is being used to prevent rolling blackouts when demand spikes and centralized power plants can’t keep up.

Sunrun’s emergency power contribution has grown more than tenfold since last summer. LUMA expects more than 75 energy shortfall events between now and October, with each dispatch sending electricity to the grid for four consecutive hours. During several recent evenings, Sunrun and other virtual power plant (VPP) operators provided enough energy to offset a 50-megawatt generation gap, LUMA said.

Sunrun CEO Mary Powell said Puerto Rico’s aging infrastructure and intense weather patterns make home battery support increasingly critical:

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It’s going to be a very difficult summer, which is why Sunrun has ramped up our dispatch capabilities, using tens of thousands of home batteries to support the grid and people of Puerto Rico.

She added that distributed power plants like Sunrun’s serve the same role as natural gas peaker plants – offering fast, reliable power during high-demand moments – but with clean energy.

Sunrun customers enrolled in the VPP will get paid too. Each participating battery earns about $200 minimum for the season, and customers who allow more of their stored energy to go to the grid earn even more. Sunrun also earns revenue for operating the VPP.

Read more: The US’s largest virtual power plant now runs on 75,000 home batteries

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