Sunrun Doubles Puerto Rico Battery Power Plant to 60,000 Customers

• Sunrun said on Nov. 3 that more than 60,000 customers with nearly 70,000 home batteries now belong to its Puerto Rico power plant.
• The fleet regularly supplies 45 MW for four hours at a time and has been dispatched more than 60 times since April.
• Puerto Rico's regulator cites a 700–850 MW generation shortfall; LUMA's plan keeps battery sharing running to June 2028.

Sunrun said on Nov. 3 that more than 60,000 customers now take part in its distributed power plant in Puerto Rico, double the more than 30,000 it reported for 2025. The fleet pools nearly 70,000 home batteries.

The network frequently delivers 45 MW for four hours at a time, Sunrun said in a statement. It has been dispatched more than 60 times since April. In a hot spell, the batteries fed the grid on 18 consecutive days from Oct. 13.

Sunrun is the largest aggregator in the Customer Battery Energy Sharing (CBES) program run by grid operator LUMA. Customers choose how much stored energy to share and are paid for it, while Sunrun earns recurring revenue from running the virtual power plant.

The island is short of generation. In a June order, the Puerto Rico Energy Bureau cited an estimated 700–850 MW shortfall and let aggregators raise the default share of an auto-enrolled battery from 20% to 30%. LUMA told the regulator it recorded 17 load-shedding events in July, 13 more than in June.

The power plant in numbers

• More than 60,000 enrolled customers and nearly 70,000 batteries, up from about 4,000 customers in 2024.
• 45 MW of dispatchable power, frequently delivered for four hours at a time.
• 180 MWh supplied in one four-hour event at 45 MW (list.solar calculation).
• Under 0.75 kW per enrolled customer on average (list.solar calculation).
• About 5–6% of the 700–850 MW generation shortfall cited by the Energy Bureau (list.solar calculation).
• 36 hours of average outages per customer in 2025 not caused by major events, versus about two hours on the mainland, EIA data show.

Sunrun joined the island's battery emergency demand response program in July 2023. That scheme was separate from the 17-MW virtual power plant Sunrun announced in 2022. LUMA told the regulator the program supplied about 50 MW for over three hours in the evenings after it expanded in July 2025.

"What began in Puerto Rico out of necessity for family resilience has become a vital blueprint for the U.S. mainland, where severe weather and the proliferation of AI data centers are demanding new energy solutions," Sunrun CEO Mary Powell said.

LUMA's 2026–2028 efficiency and demand response plan, temporarily approved by the Energy Bureau in May, keeps CBES running through June 30, 2028. A final order on the plan is still pending.