Six days after the violent storms that knocked out power to more than 2 million people in parts of the Midwest and the mid-Atlantic region, utility crews are still working to return lights and air conditioning to hundreds of thousands of others.

Nearly half of the 500,000 people who are still without power are in West Virginia. The state's heavily-forested and hilly terrain is slowing the thousands of workers trying to restore electricity.

The utility that covers much of the nation's capital and its Maryland suburbs, Pepco, has received some of the harshest criticism in the aftermath of the storm. As of this morning, it says it had restored power to more than 90 percent of its customers.

Meanwhile, a new round of summer storms is making its way across
Michigan and Ohio, knocking down trees and power lines. Some of the new outages are in areas where power had already been restored.

Utilities say more than 300,000 homes and businesses across Michigan had their power knocked out by the new round of thunderstorms.