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PV power generation is the most promising generation system, which is expected to overcome both global warming problems and energy resource shortage problems. However, the present PV systems are inferior to conventional generation systems in terms of power generation cost, resource securing and power quality, though its installation is increasing rapidly because of subsidy systems introduced by many countries. In order to achieve a great growth under consumers' free will, overcoming those issues, that is to achieve grid parity, is necessary. As it is impossible to achieve grid parity only by PV system manufacturers, it is necessary to cooperate with electric power companies, academic and governmental organizations.