NextEra Energy Inc. hired Black & Veatch Corp. to build three solar farms that will triple the photovoltaic capacity of its Florida Power & Light unit.

The projects will each have 74 megawatts of capacity, Florida Power said Wednesday in a statement. Alys Daly, a spokeswoman for the Juno Beach, Florida-based utility, said they will have a total cost of as much as $420 million.

Construction on the Babcock Ranch solar farm in Charlotte County, the Citrus project in DeSoto County and the Manatee plant in Manatee County is expected to begin in 2015 and take about a year. Terms of the contract with Black & Veatch weren’t disclosed.

Florida Power already has three solar farms with a total of 110 megawatts of capacity

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