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Solar Electricity Interchanged for Peak Cut Adjustment

2014/07/09 19:36
Kenji Kaneko, Nikkei BP CleanTech Institute
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Mitsui Fudosan Co Ltd opened "Gate Square," the core facility of "Kashiwanoha Smart City," which the company is developing in Kashiwa City, Chiba Prefecture, Japan, July 8, 2014.

Kashiwanoha Smart City is a project for developing the area surrounding Kashiwanoha Campus Station on the Tsukuba Express Line by building high-rise condominiums, commercial facilities, office buildings, etc. In Gate Square, there are specialty shops, offices and hotels in addition to "Kashiwanoha Smart Center," which controls "Kashiwanoha AEMS (area energy management system)." Kashiwanoha AEMS optimizes energy supply for the entire urban area.

On the roof of Gate Square, there is a solar power generation system whose output capacity is about 220kW. Also, in an "energy building" adjacent to Gate Square, there is a lithium-ion storage battery system (output: 500kW, capacity: 3,800kWh). "Lalaport Kashiwanoha," which is located across a public road, has a solar power generation system with an output capacity of about 500kW on its roof and a NaS battery system (output: 1,800kW, capacity: 11,850kWh).

In normal situations, electricity generated with the solar power generation systems is stored in the rechargeable batteries. And when the demand peaks, it is discharged and supplied to reduce the amount of electricity received from Tokyo Electric Power Co Inc (TEPCO), which is a power company.

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