Multi-state utility Pepco Holdings, said Sunday it is assisting neighboring electric utilities to restore power after an early snowstorm over the Mid-Atlantic and Northeast on Saturday created power outages across the region.

Estimates of electricity customers without power range from 3 to 5 million.

Pepco – which has customers in Delaware, the District of Columbia, Maryland and New Jersey - said it released 350 overhead line personnel and 200 tree trimmers to support the restoration effort.

Some utilities said Saturday that it would take several days to restore service after power lines went down, often due to collapsing trees heavy-laden with snow. PHI personnel from Pepco, Delmarva Electric and Atlantic City Electric will be assisting, the company said.

“When we have asked for assistance in the past, many utilities have responded,” said George Nelson, PHI’s VP of Operations and Engineering. “Now as other utilities have asked for our assistance, it is our time to help them restore power to their customers.”