Among such projects that were announced in the past, a solar power plant in Chitose City with a total PV inverter capacity of 28MW (panel capacity: 39MW) and a battery capacity of 14MWh is the largest. But the scale of Softbank Tomatoh Abira Solar Park 2 will be even larger than that.

Also, the mega solar plant is required to comply with limitless/uncompensated output control (based on the designated power producer system) for grid connection. Under the feed-in tariff (FIT) policy, uncompensated output control can be imposed for up to 30 days (30-day rule).

However, under the designated power producer system, uncompensated output control can be imposed for more than 30 days, potentially affecting terms of financing. It is SB Energy's first project for which a project finance loan has been structured under the designated power producer system.

Output control under the 30-day rule and the designated power producer system is required when there is a possibility that power supply will exceed the power demand of the entire grid due to an increase in the amount of renewable energy-derived electricity, and the output of renewable energy-derived electricity is reduced by the hour. The storage battery for Softbank Tomatoh Abira Solar Park 2 is targeted at dealing with short-period fluctuation and is not expected to be used for output control by the hour.

The Ministry of Economy, Trade and Industry's subsidy for Sustainable open Innovation Initiative (SII) was not used for the introduction of the battery.