This paper presents a Multi-objective Economic Dispatch and Unit Commitment Problems (EDUCP) Considering valve point effect Using heuristic algorithm (MOPSO). The proposed method can be applied to solve dynamic power dispatch problem (with specific period such as 24 h) and to solve unit commitment problem. The proposed method also can be combined with other metaheuristic or classical methods to create more powerful optimization technique. The test systems with up to 10 generating units have been used to show the performance of MOPSO. A ten-unit test system with nonsmooth fuel cost function is used to illustrate the effectiveness of the proposed method compared with those obtained from ECE, MDE, HSP and HBPSO.