The CEP generation method is simple cycle, which uses aeroderivative turbines similar to those used in the aviation industry. It does not rely on steam to produce power, so it uses significantly less water than other types of generation, such as a combined-cycle natural gas power plant. Before the Coolidge site property was a natural gas generating site, the allowable groundwater use on the property was 736 acre-feet per year. After the proposed expansion, total water usage at Coolidge Generating Station is not expected to exceed 450 acre-feet per year — a 40% reduction in the water use previously allowed on the property. After completion of the expansion, SRP will discontinue the use of groundwater and will rely exclusively on stored Central Arizona Project (CAP) water to serve the Coolidge Generating Station. SRP has already stored sufficient water in the Pinal County Active Management Area (AMA) to support an expanded Coolidge Generating Station for more than 60 years.