Hundreds of thousands of homes and businesses in Michigan are without power as much of the nation grapples with a severe heat wave. After two storms swept through the state on Friday and Saturday, Detroit-based energy company DTE announced 390,000 of its energy customers had lost electricity as of Sunday afternoon. “Overall, we expect to restore 150,000 customers today and another 150,000 tomorrow, which means we will have 80% of our customers restored by the end of the day on Monday,” the company said in an emergency outage section of its website.