This paper presents a formulation of outage planning for electric power facilities treated as a combinatorial optimization problem considering power supply reliability. We utilize two indices to evaluate a security level of system configurations during outage works. The indices are defined as power supply shortage and overloading assuming N-l contingencies. A lot of constraints are also introduced to this problem with respect to the allocation of outage works and the determination of system configurations. Since it is expected that solving the problem is so hard due to combinatorial explosions，we apply a genetic algorithm to obtain feasible solutions. In the past，we applied a Simple GA( SGA) which need to set genetic parameters，but it is so complicated to parameterize because SGA has a lot of parameters decide. In order to solve this problem，we use a Parameter-free GA (PfGA) which does not need to set parameters except for number of generations. Simulations are executed to the test system which is the 110kV transmission system. As a result ，the solutions by PfGA are better than the solutions by SGA.

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