A Tokyo-based chemical firm is building energy-efficient homes that it claims will allow occupants to virtually do away with monthly electricity bills.
The housing division of Sekisui Chemical Co. has been selling homes equipped with its "zero-cost-electricity system" since January. And power companies, once opposed to this type of arrangement, have welcomed the move.
The system combines a solar power generator, efficient water heater and airtight housing structure that maintains a constant temperature inside the home.