Good point

■This is clean generation of electricity form that carbon dioxide isn't discharged at all at the time of the generation of electricity.

■No matter how much it uses, the solar light which becomes a source of energy is free!!

■Maintenance is comparatively easy because there is no movement part in this.

■It faces though fossil fuel is finite resources, and permanent as for the energy of the sun.

■The electric power left over can be sold to the electric power company.

■Because it is installed on the roof, it becomes the double roof structure of the former roof and the solar panel. Rise in indoor temperature of summer and a room temperature decline by radiation cooling of winter are controlled. It becomes the reduction of the air-conditioning fee.

■It is relieved even if a power supply for the emergency is taken because it generates electricity as long as there is solar light even when it is cut by electricity.

Bad point

■Because it is low, the establishment area of a certain degree is necessary with generation of electricity efficiency's being surprising.

■It can generate electricity only in the daytime to have solar light. And it is decided by the weather, too, and fixed generation of electricity can't be done.

■A generation of electricity unit price is comparatively high when it is compared with other generation of electricity equipment though a price decreases year by year.

■A solar battery has a life.