Afandi, A.N. Abstract. 2023. An economic power system operation (EPSO) can be expressed by a total operating cost. Technically, this payment is presented by individual cost of generating units based on a schedule of committed power outputs (CPOs) to meet a total load demand. Presently, a minimum operating cost is performed by considering an economic dispatch and an emission dispatch, which are composed into a combined economic and emission dispatch (CEED) problem. This paper introduces a newest artificial intelligent computation, harvest season artificial bee colony (HSABC) algorithm, for determining CPOs based on a minimum total cost of CEED using IEEE-62 bus system. Simulation results show that HSABC has short time computations and fast convergences. Space areas give different implications on HSABC’s performances. (Power Technology Meeting: power system technology, Japan)