Most of the electricity is produced by fossil-fuel now. More than 70% percent of electricity come from coal in china. The fossil-fuel-based energy consume will produce greenhouse gas which alter climate and the fossil-fuel-based energy will be used out in the future . Sunlight is free and can be get forever. Solar power will be the important power source in the future, although the solar power generate equipment is still expensive and can’t been produced at night and cloudy days, large installation area is needed too.

The government encourage people to install solar power equipment on the roof or outside of houses. The cost of the solar power equipment must get more and more cheap according with the technology development. And the solar power get more and more popular especially in the country. The bad air condition and pollution urge government make up their mind to control fossil-fuel consume. The nuclear power is efficient but it’s too dangerous when some accident happen.  The wind power is clean but it only be produced in many certain location of china. The solar power is more clean and available than other power. Maybe we can get most energy from the solar power on our roof in 10 years