The Shaw Group Inc. and Westinghouse Electric Co. LLC have signed a contract for engineering, procurement and construction of a two-unit nuclear powerplant at a greenfield site in Levy County, Fla. Progress Energy Florida Inc., the owner, expects to receive a combined construction and operating license from the Nuclear Regulatory Commission by early 2012. Current plans are for operation of the plant in the 2016-18 time frame, after which Progress Energy will retire its two oldest coal-fired units at the Crystal River Energy Complex in Citrus County, Fla. The new units will be AP1000 pressurized-water reactors, rated at 1,105 MW. The contract value was not disclosed.