Renewable sources of electricity would seem to be solar, wind, hydro, geothermal, biomass, and nuclear. According to https://www.reuters.com/business/energy/japan-can-achieve-90... 24% of their energy is renewable today and they're planning on significantly boosting nuclear.
76% of their energy comes from gas and oil from other countries. Toyota and other Japanese manufacturers seemed to focus on their domestic market, meaning hybrids or ICE vehicles instead of EVs. Electric vehicles are becoming drastically more popular in the US and Europe.
Toyota talks about how the battery requirements of 1 EV could be used for a dozen hybrids. And they're right. But it's also besides the point.
https://en.wikipedia.org/wiki/Solar_power_in_Japan https://en.wikipedia.org/wiki/Wind_power_in_Japan