Graduate School 【 display / non-display

  • The University of Tokyo  Master's Course  2011.03

  • The University of Tokyo  Doctor's Course  2014.03

Campus Career 【 display / non-display

  • University of Shiga Prefecture  School of Environmental Science  Department of Environmental Policy and Planning  Lecturer   2019.04 - Now

  • University of Shiga Prefecture  School of Environmental Science  Department of Environmental Policy and Planning  Assistant Professor   2016.10 - 2019.03

External Career 【 display / non-display

  • National Institute for Environmental Studies  Center for Social and Environmental Systems Research  Research Associate   2014.04 - 2016.09


Papers 【 display / non-display

  • Japan's long-term climate mitigation policy: Multi-model assessment and sectoral challenges

    Sugiyama M., Fujimori S., Wada K., Endo S., Fujii Y., Komiyama R., Kato E., Kurosawa A., Matsuo Y., Oshiro K., Sano F., Shiraki H.

    Energy  Energy   1120 - 1131  2019.01

    10.1016/  Joint Work  


    © 2018 The Authors Japan is the sixth largest greenhouse gas emitter in 2016 and plays an important role to attain the long-term climate goals of the Paris Agreement. One of the key policy issues in Japan's energy and environmental policy arena is the energy system transition to achieve 80% emissions reduction in 2050, a current policy goal set in 2016. To contribute to the ongoing policy debate, this paper focuses on energy-related CO 2 emissions and analyzes such decarbonization scenarios that are consistent with the government goals. We employ six energy-economic and integrated assessment models to reveal decarbonization challenges in the energy system. The modeling results show that Japan's mitigation scenarios are characterized by high marginal costs of abatement. They also suggest that the industrial sector is likely to have a large final energy share and significant residual emissions under the 80% reduction scenario, though it is generally thought that the transport sector would have large decarbonization challenges. The present findings imply that not only energy policy but also industrial policy may be relevant to the long-term environmental target. Given the high marginal costs exceeding those of negative emissions technologies that could place a cost ceiling, further model development would be crucial.

  • Addressing Key Drivers of Regional CO2 Emissions of the Manufacturing Industry in Japan

    Ken’ichi Matsumoto, Yosuke Shigetomi, Hiroto Shiraki, Yuki Ochi, Yuki Ogawa, Tomoki Ehara

     The Energy Journal  40 (1)    2019

    Joint Work  Joint(The vice charge)

  • Driving forces underlying sub-national carbon dioxide emissions within the household sector and implications for the Paris Agreement targets in Japan

    Shigetomi Y., Matsumoto K., Ogawa Y., Shiraki H., Yamamoto Y., Ochi Y., Ehara T.

    Applied Energy  Applied Energy  228   2321 - 2332  2018.10

    10.1016/j.apenergy.2018.07.057  Joint Work  


    © 2018 Elsevier Ltd This study investigated insights into reducing energy-related CO2 emissions in households by examining individual socio-economic drivers at a sub-national level. Specifically, the logarithmic mean Divisia index technique was used to decompose CO2 emission trends into six drivers in all 47 prefectures of Japan during the period from 1990 to 2015. Drivers included the change in the number of households (household effect), distribution of households (distribution effect), household size (size effect), per-capita household energy consumption (consumption effect), household energy choice (choice effect), and sectoral CO2 emission intensity (intensity effect). The results showed that, in contrast to size and the distribution effects, the number of households had a positive, significant effect on CO2 emissions, indicating that recent demographic trends are responsible for the increase in CO2 emissions observed in most of the prefectures during the study period. With regard to effects related to consumption and choice, CO2 emissions due to changes in lifestyle dropped in only seven prefectures and reductions due to changes in sectoral energy choice were seen in only two prefectures in 2015. The intensity effect boosted the emissions of these prefectures the most in 2015 because of the shutdown of nuclear power plants due to the Great East Japan Earthquake. Further, we identified those prefectures that needed to reduce their per-capita energy consumption level in order to attain the reduction targets for household CO2 emissions in 2030 from 2015, given projected changes in demographic trends and recent and projected emission intensities. In order to achieve reductions in total CO2 emissions in line with the Paris Agreement, it is important to prioritize national and local policy interventions for the transfer of new household energy technologies, upgrade household appliances, and encourage people to limit energy consumption in light of the differences in these key drivers in each prefecture.

  • Energy security performance in Japan under different socioeconomic and energy conditions

    Matsumoto K., Shiraki H.

    Renewable and Sustainable Energy Reviews  Renewable and Sustainable Energy Reviews  90   391 - 401  2018.07

    10.1016/j.rser.2018.03.070  Joint Work  


    © 2018 Elsevier Ltd A secure energy supply is indispensable for Japan's economic activity, but it is becoming more difficult to attain, due to increasing energy demand in emerging countries. The pattern of socioeconomic development and the achievement of a low-carbon society are also strongly related to energy security. This study evaluated energy security performance in Japan under alternative scenarios of future socioeconomic and energy conditions by applying three energy security indicators derived from the Shannon-Wiener diversity index. The 2050 Japan Low Carbon Navigator was used to estimate energy structures under five socioeconomic scenarios and three selected combinations of effort levels toward producing a low-carbon society. It was found that the effort levels were the most influential factors in determining energy security performance, because they greatly affect energy supply and demand. The choice of socioeconomic scenario was also influential, although the impact of this choice was less significant than the choice of effort level. However, the impact of country-risk indicators is less substantial than the above two factors. The energy security performance of Japan will improve in the future, compared with the current level. However, if the country pursues further economic growth, its energy security performance will not greatly improve. Consequently, increasing efforts to achieve a low-carbon society will contribute to the realization of a highly energy-secure society with respect to Japan's current and future socioeconomic situation.

  • Dynamic linear modeling of monthly electricity demand in Japan: Time variation of electricity conservation effect

    Keita Honjo, Hiroto Shiraki, Shuichi Ashina

     PloS one  13 (4)    2018

    Joint Work  Joint(The vice charge)


     74 (5)   I_369 - I_378  2018

    Joint Work  Joint(The main charge)

  • The impacts on climate mitigation costs of considering curtailment and storage of variable renewable energy in a general equilibrium model

    Dai, H., Fujimori, S., Silva, H. D., Shiraki, H., Masui, T., Matsuoka, Y.

     Energy Economics    2016

    Joint Work  Joint(The vice charge)

  • Effect of Energy Saving Campaign in Fukushima

    Shiraki, H., Tanaka, H., Nakamura, S.

     IAIA16: Resilience and Sustainability    2016

    Joint Work  Joint(The main charge)

  • Analysis of Optimal Locations for Power Stations and Their Impact on Industrial Symbiosis Planning under Transition toward Low-carbon Power Sector in Japan

    Shiraki, H., Ashina, S., Kameyama, Y., Hashimoto, S., Fujita, T.

     Journal of Cleaner Production  114   81 - 94  2016

    Joint Work  Joint(The main charge)

  • Estimating the hourly electricity profile of Japanese households – Coupling of engineering and statistical methods

    Shiraki, H., Nakamura, S., Ashina, S., Honjo, K.

     Energy  114    2016

    Joint Work  Joint(The main charge)

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Conferences 【 display / non-display

  • Estimation of Flexibility Resources for Power System Stabilization under a Long-term Low Carbon Scenario

    24th AIM International Workshop  2018.11

  • Integrated Assessment and Rapid Technological Changes - toward shorter IPCC cycle

    International Energy Workshop  2018.06