FPL is the biggest power company in Florida serving nearly half of the state's 20.6 million residents.
FPL said Sunday that it had gone ahead with a partial shutdown of one of its nuclear power plants, but that the other continued to be fully operational and remained safe.
Hurricane Irma threatens to knock out power to more than 4.1 million homes and businesses served by Florida Power & Light, affecting around nine million people based on the current storm track, the utility's chief executive said on Friday.
FPL, a subsidiary of NextEra Energy Inc, generates enough power for about 1.9 million homes at the Turkey Point and St. Lucie plants, which are both along Florida's Atlantic Coast, about 20 feet (6 meters) above sea level.
Flagler and Volusia counties could see wind gusts up to 90 miles per hour early Monday morning. That is a decrease from the Category 5 designation Irma previously held.
The company will adjust the plans as necessary, "depending upon the path of the storm", Gould said. "Everybody needs not to get lulled into complacency".
FPL said it now has 16,000 crews from around the country - from California, Massachusetts Texas, Colorado and Wisconsin, including its own to restore power once hurricane and tropical winds subside.
Eight Bakersfield PG&E line workers boarded a plane heading for Florida to help with power restoration efforts following Hurricane Irma.
FPL also said it will proactively shut down certain substations before they flood, so they can turn them back online more quickly.
FPL's nuclear plants are protected by thick concrete and reinforced steel and like many plants around the world were bolstered further after the 2011 Fukushima nuclear disaster in Japan, Gould said.