The report gives results of a study to produce a 1980 utility data base that meets the needs of National Acid Precipitation Assessment Program (NAPAP) task groups for utility data. (NOTE: The focus of emission inventory activities within NAPAP is to estimate emissions of pollutants of concern to the acid deposition phenomenon. Electric utilities emit a large share of total acid deposition precursor emissions.) Special emphasis was placed on meeting data needs of atmospheric modelers, emission forecasters, and policy analysts. The product of the analysis, the NAPAP Utility Reference File (NURF), now serves as the source of emissions data for the 1980 NAPAP emission inventory. It also serves as the source of operating and economic data for utility simulation models. Because both fossil and non-fossil units are included, the total number of units is more than 11,000. Utility NOx and SO2 emission estimates made using NURF data for 1980 are 6.5 million and 17.5 million tons, respectively.