Economic load dispatch is one of the most important problems in power system operation; therefore the aim of this paper is to establish a method to reduce electricity generation costs with a new approach. In this paper, Particle Swarm Optimization (PSO), Artificial Bee Colony algorithm (ABC) and Artificial Cooperative Search algorithm (ACS) solutions to Economic Dispatch (ED) have been found. A sample consisting of six and ten unit thermal generators with transmission losses are presented. Results taken with both methods have been compared to each other.