The report is one of 11 in a series describing the initial development of the Advanced Utility Simulation Model (AUSM). The AUSM is one of four stationary source emission and control cost forecasting models developed by EPA for the National Acid Precipitation Assessment Program (NAPAP). The AUSM projects air pollution emissions (SO2 and NOx), generating technology types and costs of operation, and combinations of fuels and emission control technologies to simultaneously meet electric demand and emission constraints on a least cost basis for each year through 2010. Thirteen electric demand regions are simulated, and output is provided for each of the 48 contiguous states. The initial version of AUSM, Version 1.0, was delivered in November 1984 and August 1985. Further development of the AUSM between 1985 and 1988 has resulted in the development of Versions 2.0 and 3.0. Reports describing these revisions to the initial Version 1.0 of AUSM are also part of the series.