2026 Volume 52 Issue 4 Pages 65-72
To promote a renewable energy, this study focuses on installing large scale photovoltaic (PV) in deserted arable land. The aim of this study is to assess the feasibility of smart network consisting of large-scale PV assumed to be installed in deserted arable land, i.e., 22 regions in four prefectures in Tokai area in Japan, H2 produced by water electrolysis using the power generated by PV, conversion from H2 to H2 carrier, transportation from deserted arable land to Nagoya where large energy is used, and power generation after transportation. This study evaluates energy efficiency, CO2 emission ratio during the total processes as well as resilience effect which means how many days can cover the electricity demand of all households living in Nagoya city. As a result, the case of installing large scale PV in Omaezaki city exhibits the highest power generated by large scale PV of 664 GWh among the investigated 22 regions. In addition, the case of installing large scale PV in Omaezaki city can provide the electricity for 40 d after transportation of liquefied CH4 to Nagoya city by means of power generation by LNG combined cycle. The energy efficiency and CO2 emission ratio, which are the best in the case of installing large scale PV in Toyota city, is the largest for the combination case of liquefied CH4 conversion and power generation by LNG combined cycle and is the smallest for that of liquefied H2 conversion and power generation by PEFC, respectively. Under these conditions, the highest energy efficiency of 46.3% and the lowest CO2 emission ratio of −6.4%, respectively are obtained.
