The unit commitment program for the GE 412 digital process control computer optimizes the shutdown and startup of generating units so as to achieve minimum system fuel costs. Additional savings in the order of two to fifteen dollars per year per MW of installed capacity are estimated [1] over those gained from a feasible schedule. The program is flexible and considers numerous special operating restrictions. Several problems pertinent to Florida Power Corporation were solved within the program framework. Interrelation with other programs and various output options are discussed.