Florida's governor warned this week that Irma is on track to be "bigger, faster and stronger" than Hurricane Andrew, the devastating Category 5 storm that caused major damage in the state in 1992.
As the storm pushed north, outage figures were increasing at other large utilities, including units of Duke Energy Corp, Southern Co and Emera Inc.
Meanwhile, Duke Energy reported Monday morning that more than 860,000 of the homes and businesses it serves in Florida were without power. However, they warned its maximum sustained winds were 70 miles per hour with higher gusts.
The hurricane weakened into a still-dangerous tropical storm overnight as it pushed inland, triggering record flooding in Florida's northeastern corner.
The Times reports that as many as 5.8 million people in the state are without power, and at least four people are reported dead.
The storm has moved past Florida and is heading toward Georgia and Alabama but peek says his job is still not complete.
Jacksonville, Florida, is about 400 miles from where Irma first made landfall, in the northeastern corner of the state. That was down from a peak over 1.4 million on Monday night.
"Stay off the roads, stay off the streets, let us complete our assessment, clear the roads of water, power lines, trees and then you can get out there and determine what happened to your individual property or your neighborhood", Fort Lauderdale Mayor Jack Seiler told CNN.
Hurricane Irma is blasting up the west coast of Florida after buffeting the city of Miami, with unsafe flooding along long stretches of coast. FPL is a unit of Florida energy company NextEra Energy. The plant stopped operating in 2009 and was retired in 2013. Florida Gov. Rick Scott flew over the hard-hit but isolated Keys on Monday and said he saw "devastation" that included boats washed ashore and mobile homes pummeled by the storm. In the Atlanta metro area, about 496 stations, or 12.2 percent, were out of gasoline, according to information service Gas Buddy.
Construction cranes collapse in downtown Miami
But the horizontal arms of the tall tower cranes remained loose despite the potential danger of collapse. City officials warned residents of nearby buildings to stay away from windows overlooking the crane.