Evaluation of carbon sequestrations in Japan with a mathematical model

Cost effectiveness Of CO2 sequestration, especially into aquifers, strongly depends on the sequestration capacities and the routes connecting their sites and CO2 recovery sites. This site dependency Of CO2 sequestration makes their evaluations difficult. In order to evaluate C 02 sequestration in parallel with other carbon mitigation options in Japan, a new model has been developed for this study. Explicit modeling is made for energy systems and also CO2 recoveries from fossil fuel power plants, CO2 transportation and sequestration processes. To pay due consideration to the site dependency, the land area of Japan is divided into 20 regions and the off-shore area also into 20 regions. The land regions have various types of electric power plants and other energy systems. On the other hand, the off-shore regions have aquifers for CO2 sequestration. In addition, CO2 sequestration into the ocean is taken into account. These model regions are inter-linked to each other to evaluate CO2 transportation between the CO2 sources and the reservoirs. The total costs of energy systems and CO2 sequestration in Japan between the year of 2000 and 2050 is minimized in this model. This paper describes the structure of this new model for evaluation Of CO2 sequestrations in Japan, and presents optimized solutions as to when, where and how much CO2 sequestration and other carbon mitigation options should be implemented under assumed carbon mitigation policy options using this new model.