Sunrun Doubles Puerto Rico Home Battery Network to Over 60,000 Customers
Sunrun said on 3 November 2026 that participation in its Puerto Rico distributed power plant has doubled to more than 60,000 customers, and that the grid operator called on their home batteries on 18 straight days in October.
What Sunrun reported
According to the company's release, the network includes nearly 70,000 home batteries and delivers 45 MW of dispatchable power for four hours at a time. It has been dispatched more than 60 times since April. Enrolment was about 4,000 customers in 2024 and more than 30,000 in 2025.
Electrek reports that the daily dispatches started on 13 October during unusually hot weather. Sunrun describes itself as the largest aggregator in Puerto Rico's Customer Battery Energy Sharing programme, where the grid operator LUMA calls on batteries when demand or reserve needs may exceed available generation.
How customers take part
Sunrun says customers choose how much energy to share, and most contribute a small part of their battery capacity so that they keep reserve power for outages. Participants are paid for the energy they share. The release also quotes Sunrun's chief executive calling the programme a blueprint for the US mainland.
Why Puerto Rico matters as context
Electrek cites US Energy Information Administration data showing Puerto Rican customers averaged 36 hours without power in 2025, outside major events, which was 19% more than the year before. That context is important: this is a grid with long-standing reliability problems, which makes the case for battery sharing unusually strong.
Electrek also reports that LUMA said in July that the wider programme, with more than 90,000 participating customers, helped provide an average of 75 MW during generation shortfalls. A regulatory filing in April said the roughly 50 MW of four-hour capacity at the time could not prevent every rolling blackout in 2025.
What it means for UK homes
The numbers describe one island grid and one company, so they do not translate into UK savings. The idea is the same as the one we describe in virtual power plants turn home batteries into grid assets: many small batteries acting together. Most of the figures here come from Sunrun itself, and we have not verified them independently.
Sources
- Sunrun (GlobeNewswire via Finviz): Sunrun doubles Puerto Rico distributed power plant participation as grid operator calls on home batteries to help prevent outages
- Electrek: Puerto Rico tapped Sunrun's home batteries for 18 straight days
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