Kuradashi and Hongo Tsuji Smart Asset established Kuradashi Investment LLC, a joint venture through which they will develop and operate grid-scale battery storage projects across Japan, the companies announced on June 23, 2026.
According to the statement, Kuradashi will hold a 51% interest in the joint venture via a TK-GK (silent partnership) structure and be in charge of asset management. Hongo Tsuji Smart Asset will own the remaining 49%. The partners also aim to secure debt financing. They plan to task YK Engineering with engineering, procurement, and construction (EPC).
Initially, Kuradashi Investment will develop three 2MW/8MWh projects, one each in Saitama, Gifu, and Kumamoto prefectures. The facilities are expected to be commissioned in October 2026, November 2026, and May 2027, respectively.
The joint venture’s launch formalizes a scheme Kuradashi and Hongo Tsuji Smart Asset planned under a memorandum of understanding signed in November 2025. At the time, the companies were targeting the development of a joint portfolio of five or more assets.
Kuradashi commissioned its first grid-scale battery storage asset, the 1.99MW/8.14MWh Tochigi Koyama Power Storage Station, in September 2025. It also disclosed plans to develop four additional facilities and take a 13.37% economic interest in a Power Pool-affiliated special purpose company holding six projects.
Hongo Tsuji Smart Asset, a unit of Hongo Tsuji Tax & Consulting, has been supporting investors with solar project-related transactions, development, and operation, and has also been involved in the sales and installation of residential and small-scale commercial battery storage systems.
