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This paper presents a Biogeography Based Optimization (BBO) algorithm to solve Economic Load Dispatch (ELD) problem of thermal power units while satisfying generator and network constraints. Biogeography-based optimization (BBO) is a relatively new optimization technique. Mathematical models of biogeography describe how a species arises, migrates from one habitat (Island) to another, or gets extinct. This algorithm searches for the global optimum mainly through two steps: Migration and Mutation. The effectiveness of the proposed algorithm has been verified on IEEE 30-bus, 6 generator system. Considering the quality of the solution obtained, this method seems to be a promising alternative approach for solving the ELD problems under practical conditions.