Impacts of Large-scale Penetration of Non-industrial Cogeneration Systems on CO2 Emission in Japan

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  • Asano Hiroshi
    Graduate School of Engineering, The University of Tokyo Socio-Economic Research Center, Central Research Institute of Electric Power Industry
  • Takahashi Masahito
    Socio-Economic Research Center, Central Research Institute of Electric Power Industry
  • Nishio Ken-ichiro
    Socio-Economic Research Center, Central Research Institute of Electric Power Industry

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  • 民生用コージェネレーション普及による需給両面におけるＣＯ２排出変化の分析
  • ミンセイヨウ コージェネレーション フキュウ ニ ヨル ジュキュウ リョウメン ニ オケル CO2 ハイシュツ ヘンカ ノ ブンセキ

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Abstract

This paper presents a quantitative evaluation of CO2 emission from grid power systems and heat source systems including CHP (combined heat and power) in residential and commercial buildings in Japan. We estimated changes in CO2 emission from the utility grid and from CHP using an optimal generation planning model. Through quantitative simulation runs, the authors obtained the following results. First, introduction of CHP at a certain degree brings an increase of CO2 emission until 2020 regardless of the pace of nuclear power development. Second, because CHP will defer highly-efficient AGCC (advanced gas combined cycle generation) due to suppressed demand growth of utilities in the daytime when most of commercial CHP systems operate. CHP can reduce CO2 emission only if generating efficiency of CHP will be improved up to 50% or higher.

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