The objective of the power systems firm is to achieve the maximum profit and customer goodwill by providing reliable and quality power supply. This is a power system operation problem, Optimal Power Flow (OPF) solutions gives operating state which satisfy the objective of the firm. Modern trend used to solve this non-convex, complex OPF problem is Meta heuristic algorithms. This paper deals one of them - Genetic Algorithm (GA), for solving OPF. Performance of the proposed algorithm is tested on the standard test IEEE 30 bus system.