Grid battery capacity up more than tenfold in three years, webinar to outline adoption trends
Connected capacity reached about 840,000 kW at the end of March 2026, driven by rule changes and a surge in applications.
Japan Branding Co., Ltd. announced that it will hold an online webinar on grid-scale storage batteries in mid-November 2026. The company, headquartered in Inuyama City, Aichi Prefecture, serves as the exclusive Japan distributor for GUS Technology batteries.
According to the announcement, connected capacity of grid-scale batteries is growing rapidly. From near zero in January to May 2023, capacity reached 70,000 kW in December 2023, 170,000 kW in December 2024, 640,000 kW in December 2025, and about 840,000 kW at the end of March 2026, a more than tenfold increase in three years.
Grid-scale batteries are large storage systems connected to the power grid that store electricity and discharge it when needed. They smooth output fluctuations from renewable energy and are used to balance electricity supply and demand.
Meanwhile, as of the end of March 2026, grid connection applications under review totaled 191.14 million kW, and contracted applications reached 35.27 million kW. The 840,000 kW of connected capacity equals about 2.4% of contracted applications and about 0.4% of applications under review, showing a wide gap between applications and actual connections.
The number of grid connection applications under review rose from about 600 in fiscal 2022 to about 25,000 in fiscal 2025. Contracted applications also surged, from about 40 in fiscal 2022 to about 3,900 in fiscal 2025.
The rapid expansion is said to be linked to regulatory changes, including the introduction of a batch review process, the application of non-firm grid connection in local grids, and the launch of the Long-Term Decarbonization Power Source Auction. Non-firm connection is a method of connecting to the grid at locations with limited spare transmission capacity, on the premise of certain constraints.
The Long-Term Decarbonization Power Source Auction is a Japanese bidding system that guarantees long-term fixed revenue for new decarbonized power sources.
The webinar will review trends in deployment and the gap between applications and connections, and will address how to approach entering or investing in grid-scale battery businesses.
BLUE NOVA Hydrogen Journal view
Grid-scale batteries are a field where deployment is advancing quickly alongside the expansion of renewable energy. The growth in connected capacity suggests that rule revisions have changed the flow of grid connection and contracts. However, connected volume remains small compared with the scale of applications, leaving a large unrealized portion between application and connection. For businesses, the key to investment decisions is to assess the feasibility of connections and the requirements of the system, rather than reading growth in deployment directly as market expansion.
Source: PR TIMES
This article was written by the editors based on the cited report and translated from Japanese. AI is used to assist in writing and translation.
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