The objective of the study was to predict the largest annual average sulfur dioxide (SO2) concentrations, maximum 24-hour SO2 concentrations, and maximum 3-hour SO2 concentrations produced per year by a new modern 1000 megawatt electric power plant that complies with the federal New Source Performance Standards for SO2 emissions from coal-fired power plants. The prediction evidence from this study is intended for use in final decisions by the U.S. Environmental Protection Agency concerning federal standards to be promulgated on the subject of nondegradation of air quality. A total of three plant alternatives for complying with new source standards were examined: the use of a scrubber, the use of a scrubber with reheat of emissions, and the use of low sulfur coal.