About 145,000 Massachusetts homes and businesses remain without power in the wake of Tropical Storm Irene.

National Grid said Wednesday that about 108,000 of its nearly 1.3 million customers don’t have electricity. The communities of Foxborough, Attleboro, Norwell and Plainville are among the towns with highest percentage of customers without power.

NStar said as of Wednesday morning about 37,000 of its customers are still off line, mostly on the South Shore and Cape Cod.

The utilities say despite crews working around the clock, some people may not get their electricity restored until the weekend, nearly a week after Irene hit.