OTS, through its special purpose company (SPC) Kunishitaike Mega Float LLC, will supply non-fossil certificates (NFCs) associated with the output of a 7.8MWDC floating solar power plant in Miki Town, Kagawa Prefecture, to Toshiba Electronic Devices & Storage’s group business Japan Semiconductor, the companies announced on December 2, 2025.
According to the statement, OTS plans to commission the power plant within December 2025. Digital Grid will aggregate the asset and sell its output, which is expected to reach about 10.4GWh annually, in the wholesale market. It will also support settlement and the transfer of the NFCs to the offtaker. The aggregator also coordinated the PPA through its matching platform RE Bridge.
The deal follows others made by Toshiba Electronic Devices & Storage, including off-site PPAs with Kansai Electric Power and Hokuriku Electric Power expected to total about 24MW once fully operational.
OTS, a Nagoya-based solar- and grid-scale battery storage-focused company, has expanded from building power plants under the feed-in-tariff (FIT) scheme to also developing projects under PPAs. In addition to the agreement with Japan Semiconductor, it previously also signed a virtual PPA with Sony Group.
Kunishitaike Solar Power Plant is, alongside Kyocera TCL Solar’s 11.5MWAC/13.7MWDC Chiba-Yamakura Floating Mega Solar commissioned in 2018, among the largest floating solar power plants in Japan. It highlights a growing interest in developing non-traditional projects amid a shortage of land suitable for building utility-scale ground-mounted assets.
