The paper describes the evolution of a successful new combined cycle utility generation plant over nearly two decades in response to external and internal requirements for commercial, environmental and functional performance. The Afton Project followed an evolutionary path from initial development as a peaking unit into its full realization as an innovative combined cycle station utilizing a hybrid cooling system to realize its owner’s objectives for water conservation and the ability to respond to load demands in the arid Southwest. Afton, a state-of-the-art 225 MW combined cycle facility, entered commercial operation in October of 2007, delivering critically needed capacity with NOx at 3.5 ppm or less.

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