Assessment of CO2 emissions reduction potential by using an optimization model for regional energy supply systems

We have developed a prototype model for optimizing regional energy supply systems in a city. This model calculates the energy demand in a region and then finds the combination of energy supply systems that meets a required CO2 emission limit with minimum cost. We carried out an assessment of installing energy supply systems around Shinagawa area in Tokyo where waste heat from sewerage and garbage incineration is expected to be available. In this assessment, we estimate costs and CO2 emissions when the energy supply systems are installed. We conclude that 17% of CO2 emissions from energy supply could be reduced with the same annual total cost as the current combination of energy supply systems in the Shinagawa area. Also, we show that increasing the power generation efficiency of co-generation systems is effective for further reduction of CO2 emissions.