Battery storage stands out in Japan clean power auction

Japan's first auction for long-term zero emissions power capacity has attracted strong bidding interest with a plan to install battery storage, as investment in the power storage system is gaining momentum in line with expanded use of fluctuating renewable energy sources.

Japan launched the clean power auction system from the April 2023-March 2024 fiscal year, aiming to spur investment in clean power sources by securing funding for fixed costs in advance to drive the country's decarbonisation by 2050.

The first auction, which was held in January, has awarded 1.1GW capacity for battery storage, or 27pc of total contract capacity for clean power sources, excluding gas-fired generation that has been temporally included in the auction system to help ensure stable power supplies, nationwide transmission system operator Organisation for Cross-regional Co-ordination of Transmission Operator (Occto), which manages the auction, said on 26 April.

Bidding capacity for battery storage totalled around 4.6GW, the highest volume among any other clean power sources. This means the contract ratio for storage batteries was 24pc compared with the 100pc ratio for ammonia co-firing, hydrogen co-firing, biomass dedicated and nuclear capacity, along with gas-fired capacity.

Awarded capacity for battery storage as well as pumping-up electric power facilities reached 1.67GW, exceeding the 1GW sought by the auction.

Japan has secured a total of 9.77GW of net zero capacity through the 2023-24 auction. Contract volumes covered 1.3GW of nuclear, 199MW biomass, 577MW of pumping-up electric power, 770MW for ammonia co-firing and 55.3MW hydrogen co-firing, as well as 1.1GW of battery storage. This also included 5.76GW of gas-fired projects.

All winners under the auction can generally receive the money for 20 years through Occto, which collect money from the country's power retailers, although they need to refund 90pc of other revenue. The first auction saw total funding of ¥233.6bn/yr ($1.51bn) for decarbonisation power sources and ¥176.6bn/yr for gas-fired capacity.

Japan's battery requirements are expected to continue rising, with uncertainty over future nuclear availability likely to spur Tokyo to accelerate the roll-out of renewable energy to meet a 46pc greenhouse gas emissions reduction by 2030-31 against 2013-14 levels — a target still far above the 23pc recorded in 2022-23. Japan will need to install 38-41GW of renewable capacity, nearly triple actual output of 14GW in 2019.

Japan is looking to establish lithium-ion battery production capacity of 150GWh/yr domestically and 600GWh/yr globally by 2030. The trade and industry ministry projects the latter target will require 380,000 t/yr of lithium, 310,000 t/yr of nickel, 600,000 t/yr of graphite, 60,000 t/yr of cobalt and 50,000 t/yr of manganese.

By Motoko Hasegawa