Japanese power demand will increase by around 15pc if the country's entire vehicle fleet switches to battery electric vehicles (BEVs), according to an analysis by government-affiliated think-tank the Institute of Energy Economics Japan (IEEJ).
Japan's electricity demand is expected to increase by 132mn MWh/yr when all existing gasoline- and diesel-fuelled vehicles shift to BEVs, which exclude hybrids and plug-in hybrids, the IEEJ said. This is a 15pc growth from Japan's total electricity use of 896.2mn MWh in the April 2018-March 2019 fiscal year.
The impact analysis assumes 141 W/km of electric mileage and 605bn km of travelling distance for gasoline-powered cars and 116bn km for diesel-fuelled trucks and buses in 2018-19. The electric mileage figure assumes a shift from gasoline-powered vehicles. The IEEJ uses the proportion of diesel against gasoline in fuel consumption and calorific values to estimate power use generated from replacing diesel vehicles.
Japan produced 1,170.6mn MWh of electricity in 2018-19, 30pc higher than actual demand for the same period. This means the country should increase output by 171.6mn MWh/yr to meet extra demand from EVs, the IEEJ said.
The additional power demand can be met by nuclear and renewable power output if Japan continues to add to capacity of these power sources, the IEEJ said. But the country is facing challenges with restarting and replacing reactors and securing enough land to expand renewable energy, it said.
IEEJ estimates that Japan will need 18 nuclear reactors with 120MW of capacity based on 90pc operational rates to meet the EV-oriented 171.6mn MWh/yr of demand. But Japan has only nine operational reactors, with a combined capacity of 9,130MW or 72mn MWh/yr at the same utilisation.
Japan aims to ban sales of new gasoline-only cars and shift to passenger EVs, including hybrid and fuel-cell EVs, by the mid-2030s as part of an action plan to achieve its 2050 carbon-neutral goal. The country previously targeted to sell only EVs by 2050. Discussions are expected to continue until mid-2021 on possibly transitioning commercial vehicles to electric.

