Rapid rise of decarbonization potentials of rooftop PV plus EVs in residential houses
We found that rooftop PV systems in 2020 are already cost competitive relative to existing energy systems in Japan. However, "PV + EV" systems in residential houses rapidly increases its economic advantage over commercial districts due to greater rooftop space and higher number of available vehicles towards 2030. Moreover, energy sharing in the districts significantly improved the decarbonization potential. By 2025, energy cost savings, payback periods, and internal rate of return (IRR) of residential "PV + EV" systems respectively reached 23 percent, 9 years, and 11 percent, and continued improving in subsequent years. CO2 emissions from electricity and gasoline consumption was reduced by 88 percent, and the system was capable to supplying 89 percent of electricity demand.
The results indicate that residential "PV + EV" systems are a potential source for significant renewable energy generation and storage that can also produce increasingly dispatchable electricity. Policy makers, industries, and communities should prepare to establish these systems through regulatory reform and demonstration projects to scale-up after 2025.
Takuro Kobashi et al, Rapid rise of decarbonization potentials of photovoltaics plus electric vehicles in residential houses over commercial districts, Applied Energy (2021). DOI: 10.1016/j.apenergy.2021.118142
Provided by National Institute for Environmental Studies