The report presents results of a study to assess costs and feasibility of applying limestone scrubbers to eight power plants located in the State of Ohio. The plants, operated by four different electric utility companies, were selected because of the impact of current sulfur dioxide emissions on air quality and the resultant need to reduce sulfur dioxide emissions to levels consistent with State regulations. The report considers a limestone flue gas desulfurization (FGD) process. No comparisons with other FGD systems or low-sulfur fuels use are provided. The model limestone system includes a venturi scrubber followed by a mobile bed scrubber. The systems are designed with multiple scrubber modules. Module sizes range from 200,000 to 550,000 ACFM. The power plants vary from 254 to 2303 megawatts capacity. All boilers are equipped with electrostatic precipitators such that the venturi will function primarily to remove residual particulates escaping the precipitators. The systems are designed to remove 90 percent of the sulfur dioxide in the gas stream--20 to 30 percent in the venturi and the remainder in the mobile bed scrubber.