The renewable energy-derived electricity is expected to be certified as "low-carbon electricity" for the "2nd Planned Period" for the Responsibility to Reduce Total Emissions of the Tokyo Municipal Government's Environmental Securement Policy, which the government of Tokyo plans to implement in fiscal 2015.
Mitsubishi Estate Home has been meeting 100% of the power demand of the Shin Marunouchi Building with renewable energy sources especially wind and hydraulic power since April 2010. However, in the wake of the implementation of the feed-in tariff (FIT) policy, etc, it became difficult to purchase electricity with the previous scheme. By employing the partial supply scheme, it became possible to use renewable energy-derived electricity to meet half of the contract demand.
The new scheme that uses electricity from the mega-solar plant located in Sakura City, Chiba Prefecture, for the Shin Marunouchi Building enables to benefit from the peak shaving effect of the solar power plant near the demander.
In an urban area, there is a large peak demand due to air conditioning systems. Because the amount of electricity generated by a mega-solar power plant increases in those peak hours, it can be easily used for peak shaving. Under such circumstances, PPSes are actively purchasing electricity from mega-solar plants near the Tokyo metropolitan area with a premium.