[en] This report summarizes the operating experience of 67 licensed nuclear power plants during 1979. Operating statistics and data are presented for each plant that was in commercial operation at the end of the year and had sufficient electrical generation for meaningful analyses. The one exception is Three Mile Island 2. Authority to operate this facility was suspended by the Nuclear Regulatory Commission (NRC) July 20, 1979; therefore, operational data for this unit covers only the period January 1 through July 19. The commercial operating experience of 67 plants is reviewed. Included are the data for 25 boiling-water-reactor (BWR) plants; 41 pressurized-water-reactor (PWR) plants; and, for the first time, Fort St. Vrain, a plant equipped with a high-temperature gas-cooled reactor (HTGR)