FPL, a unit of NextEra Energy Inc and the state's biggest power company, said its outages dipped below 2.8 million by Tuesday afternoon from a peak of over 3.6 million Monday morning.
Still, he said, it will take days for many people to be restored and, in some cases where the damage was extensive, weeks. FPL said on Tuesday it planned to restore power to eastern Florida by this weekend and to western Florida by September 22.
In all, nearly 1.8 million FPL homes and businesses had lost power. He said 19,500 electric workers have been deployed in the restoration effort. Two elderly residents were found dead at the Rehabilitation Center of Hollywood Hills and three later died at a hospital.
The NRC inspectors are verifying that all of the preparations have been completed, and the plants' emergency diesel generators are available to be used if the storm affects off-site power supplies, the agency said in a statement.
About 150 of Florida's almost 700 nursing facilities do not have power restored, according to the Florida Health Care Association, an advocacy group representing facilities statewide.
The crews will help with power restoration efforts.
"The loss of these individuals is a profound tragedy within the larger tragedy of Hurricane Irma", the association said in a statement.
Much of the state has not yet felt the full brunt of the storm as Irma barreled across the Florida Keys on Sunday morning and headed for the state's southwest coast with maximum sustained winds of 130 miles per hour, making it a Category 4 storm, the second worst on the Saffir-Simpson scale. It gradually weakened to a tropical storm by Monday morning.