Charlotte, N.C., July 31, 2012 —The Babcock & Wilcox Co. won a contract worth more than $40 million to design, supply and install boiler pressure parts and an overfire air system, as well as perform boiler reinforcement, for the Big Stone power plant in South Dakota operated by Otter Tail Power Co. B&W PGG also will make improvements to the 450 MW coal-fired power plant's boiler to help it withstand the rigors of a new air quality control system. Enhancements to the plant's overfire air system are designed to help Big Stone achieve lower nitrogen oxides emissions while...