Japan-based grid-scale battery developer Green Battery Inc. will introduce its land-to-operation development model to the global industry, aiming to connect with supply chain partners, investors, and engineering firms to address Japan’s rapidly expanding energy storage deficit.
Japan, which imports over 99 per cent of its fossil fuels, has set ambitious targets to generate 40 to 50 per cent of its electricity from renewable sources by 2040.
However, the lack of energy storage infrastructure has created severe grid bottlenecks. Midday solar output frequently exceeds local demand, driving nationwide power curtailment from roughly 0.1 terawatt-hours in FY2018 to an estimated 2 terawatt-hours in FY2025. In March, curtailment impacted the Tokyo grid area, Japan’s primary demand hub, for the first time.
Green Battery’s business model directly targets these execution challenges by securing land titles, obtaining grid interconnection rights, and constructing standardised 2 MW / 8 MWh battery installations.
The company delivers fully completed turnkey projects to institutional buyers while accumulating an owned asset portfolio to trade across Japan’s wholesale, balancing, and capacity markets.
The developer’s expansion comes as Japanese policymakers introduce supportive measures, including 20-year contracts awarded via decarbonisation auctions and full tax depreciation benefits for qualifying battery infrastructure investments. Over 170 gigawatts of battery interconnection applications were queued across Japan by late 2025.
Green Battery CEO Kotaro Okada said Japan possesses all the essential driver metrics for a booming storage market, including record curtailment and robust government policy, requiring specialised execution partners to transform interconnection queues into active grid assets.
“RE+ brings together the technology and supply-chain partners we work with, and we want them to see the Japanese opportunity as clearly as we do.”