Sunrun has expanded its virtual power plant (VPP) network in Puerto Rico, now serving over 60,000 customers. The system comprises nearly 70,000 home batteries capable of delivering 45 megawatts of power for four-hour intervals. In October, the grid operator LUMA utilized this stored energy for 18 consecutive days to manage electricity demand during periods of high heat.
The network has seen significant growth, increasing from approximately 4,000 customers in 2024 to over 30,000 in 2025. Sunrun currently operates as the largest aggregator within the Customer Battery Energy Sharing (CBES) program. Since April, the company has dispatched battery power more than 60 times to support the island's grid.
Puerto Rico faces high electricity costs, with an average residential rate of 26.36 cents per kilowatt-hour in August, compared to the US average of 18.16 cents. Reliability remains a challenge, as customers experienced an average of 36 hours without power in 2025, excluding major events. This represents a 19% increase in outage duration compared to 2024.
The broader CBES program, which includes over 90,000 participants, provided an average of 75 megawatts during supply shortages as of July. Despite this, aggregators reported in April that current capacity is insufficient to prevent all rolling blackouts. Plans are underway to enroll more batteries to address larger supply gaps exceeding the current 50-megawatt capacity.
