In Pictures: Sunrun's Puerto Rico home battery network dispatched 18 straight days as virtual power plant doubles

Technicians install a residential battery storage unit of the kind Sunrun aggregates into its Puerto Rico virtual power plant.

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Sunrun's Puerto Rico network has grown to nearly 70,000 home batteries, more than double its earlier fleet.

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The island's dispersed home batteries are coordinated to supply grid capacity during periods of peak demand.

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Participating households can draw on their own stored solar power when outages hit the island's grid.

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The virtual power plant frequently dispatches 45 MW for four hours at a time, per Sunrun.

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Sunrun says its Puerto Rico batteries were tapped for 18 consecutive days in October.

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Puerto Rico's high electricity prices and frequent outages have driven interest in home battery backup.

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The network of roughly 70,000 batteries is managed as a single grid resource.

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Battery storage is expanding across applications, from homes to portable devices.

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