UPDATE 1-FPL to shut Florida nuclear plants ahead of Irma's winds

(Adds quotes from FPL spokesman, details on Irma)

Sept 7 (Reuters) - Electricity generator Florida Power & Light said on Thursday that it would shut its two nuclear power plants before hurricane-force winds from Irma hit the state but did not say when it would do so.

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.

"We will safely shut down these nuclear plants well in advance of hurricane-force winds, and we've finalized plans for that shutdown," FPL spokesman Rob Gould told reporters at a news conference.

The company will adjust the plans as necessary "depending upon the path of the storm," Gould said. He would not comment on exactly when the plants would be taken down or how long they could be shut.

Irma, a Category 5 storm, has winds of up to 180 miles (290 km) per hour. Its path was uncertain, but it was likely to be downgraded to a Category 4 storm by the time it makes landfall in Florida, according to the National Hurricane Center. The threat of a direct hurricane hit to Florida over the weekend and early next week was increasing, the forecaster said. (Reporting by Timothy Gardner; Editing by Lisa Von Ahn)