Hitachi, Ltd.

Kouichi Chino

Shin Takahashi

Osamu Yokomizo

Toshiki Kahara

Tsutomu Okusawa

Takaaki Mizukami

During a time zone where a power demand is smaller than an average value of the entire power demands of homes, an excess portion obtained by subtracting a power demand from a base power portion supplied by PEFC () is charged in a capacitor () and a lead storage battery () in advance; and during a time zone where a power demand is larger than the average value, a peak power portion exceeding this average value is discharged from the capacitor () and the lead storage battery (); thereby enabling the system to sufficiently meet daily home-use demand with requisite minimum equipment while effectively using surplus power. Thus, energy efficiency can be enhanced without wasting energy, and also cost efficiency can be improved.

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Hitachi, Japan

Kouichi Chino