Duke Energy Corp, the biggest power company in the United States, said Tuesday its Progress Energy Florida utility will retire the Crystal River nuclear plant in Florida.

The plant has already been safely shut down and offline since late 2009 due to damage done to the reactor's containment structure during a power upgrade and the replacement of the unit's steam generators.

There are currently 104 reactors licensed to operate in the United States. The reactors have a total capacity of about 101,000 megawatts (MW) and generate about 20 percent of the nation's power.

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