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Abstract: To realize a low-carbon society, we identified the issues that need to be addressed to construct a zero-carbon power system in Japan. First, based on the estimation of future technology development, we constructed technology scenarios using the manufacturing technology database developed by the Center for Low Carbon Society Strategy (LCS). Second, the power system was evaluated using the optimal multi-region power generation model of cost minimization, considering system stability under various constraint assumptions. We found that, in addition to the limitations imposed by the technological development of renewable energy, grid enhancement and the system stability constraint have the greatest influence on power generation cost to achieve a zero-carbon power system. Furthermore, it was shown that, as the demand for electricity increases, it becomes difficult to achieve zero emissions, and the development of renewable energy technologies that contribute to system stability such as hot dry rock geothermal energy becomes important.

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