Electric utilities across the U.S. Eastern seaboard scrambled Monday to restore service to the millions of customers left without power by Hurricane Irene, but outages continued to cover wide swaths of Maryland, Virginia, New York, New Jersey, Connecticut, Rhode Island and other states.

Companies had warned customers to be ready for outages lasting up to several weeks, though some utilities in North Carolina and New Jersey on Monday signaled they could deal with the majority of the outages by this weekend. In hard-hit Connecticut, however, a local utility said it could take longer than a week to restore power to all households.

Raleigh, N.C.-based Progress Energy Inc. said about 94,900 customers were without power as of Monday morning, down from 120,600 late Sunday, and it expects to restore power to 85% of affected customers by midnight. Some 99% of all impacted customers should see their power restored by midnight Wednesday. In the areas hardest hit by floods and sustained severe damage, work will continue into Thursday, the company said.

In Virginia and North Carolina, some 600,752 Dominion Resources Inc. customers were still without electricity, down from 825,971 late Sunday.

Baltimore Gas and Electric, a unit of Constellation Energy Group Inc., said there were 345,414 outages in its Maryland grid-down from 453,551 late Sunday. The company says it has restored power to 336,572 users.

In the Washington, D.C., area Pepco Holdings Inc. reported 51,145 customers without electricity, less than the 173,941 seen late Sunday.

Pepco's Delmarva Power & Light in Delaware reported 33,795 customers suffering outages, down from 100,354 on Sunday.

In New Jersey, PSE&G, a subsidiary of Public Service Enterprise Group Inc. said about 200,000 of its 2.2 million electric customers were without power, down from 330,000 Sunday. The utility says it expects most customers to receive power within 48 hours, "with total restoration of all customers expected within 4 to 6 days," but those households and businesses located in flooded areas "should be prepared for lengthy outages" until waters recede.

Pepco's Atlantic City Electric in southern New Jersey said there were 52,443 users without electricity, down from 108,457 Sunday. Jersey Central Power and Light said there were 367,944 customers without power, down from 373,000 Sunday. Orange & Rockland said 55,051 customers were without electricity.

In New York state, the Long Island Power Authority reported that 371,226 customers were out of power. Consolidated Edison Inc. said on its website that 89,152 customers were without power, down from 106,816 Sunday. LIPA expects 90% of customers' power on the island to be restored by the end of the day Friday. Monday morning, the utility had 1,500 workers out on the streets assessing damage, and about half of the assessments along LIPA's main power lines were complete, LIPA said in a conference call.

In Connecticut, Connecticut Light & Power said there were 591,088 customers without service, or 47% of its total customer base, less than Sunday's figure of 624,529. The utility said late Sunday in its Twitter feed it could be one week or more before all the outages are restored.

In Rhode Island more than 280,000 energy customers, representing more than half the households in the state, were experiencing outages, down from a peak of more than 300,000 late Sunday, according to figures from National Grid, a public utility.

Some power customers in Massachusetts could be facing long blackouts, local utilities warned. NStar had about 200,000 outages as of 8 a.m. Monday, with the impact widespread throughout its service territory in eastern Massachusetts, although areas around the south shore including New Bedford were particularly hard hit. National Grid, the other big electric utility in New England's most populous state, had more than 330,000 customers off line Monday morning.

A National Grid spokeswoman cited "extensive damage," particularly in western parts of the state that took a more direct hit, and said "we're looking at a multiday event" to recover. The utility is focused on public safety right now, she said, and is responding to critical customers like hospitals and fire departments. Downed trees and flooding in the west have isolated some towns, making access a problem, she said.

-By Angel Gonzalez, Dow Jones Newswires; 713-547-9214; angel.gonzalez@dowjones.com

--Jon Kamp, Robbie Whelan, Sam Schechner and Erica Orden contributed to this article.

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