The roof is made of solar battery that belongs to PanaHome Company, displayed at Tokyo Big Sight. Photo: NHK

In the exhibition, environmentally friendly products opened at Tokyo Big Sight (Tokyo) on December 12 with more than 700 participating companies, PanaHome, a subsidiary of Panasonic Electronic Company, exhibited the house which its roof is entirely made ​​of solar battery panels.

The company said that if using the charged battery, the improved solar battery panels can generate nearly enough electricity to serve households’ daily needs.