The sharp historical demarcation between federal- and state-regulated portions of the U.S. power grid needs to be rethought as local utilities see more rooftop solar and battery storage technologies in their service areas, grid officials and experts said yesterday.

Local utilities’ distributed resources, particularly customer-owned solar and storage facilities, may become large enough before long to pose potential threats to the interstate grid. Disruptions in cities or small towns — whether they’re accidental or intentional — could move upstream to the wider grid, said participants at a daylong grid security conference at the Federal Energy Regulatory Commission headquarters.

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