The plant began commercial generation with Unit 1 in 1977 and Unit 2 in 1978. Deely was constructed as a coal plant due to the economics and unreliability for
natural gas at the time. The total cost to construct the two units was $236 million. The construction of Deely included a smokestack. The plant is named after former CPS General Manager, J. T. Deely. CPS Energy commissioned in 2009 the installation of a
selective catalytic reduction (SCR) system to Unit 2 to replace an
electrostatic precipitator (ESP). ==Closure==