After the installation and integration of solar power plants, the investors will receive monthly subsidies from the state. Selling superfluous electricity to the grid will be long time benefit.

Take Shanghai for example, the national subsidy for business PV generation 0.42 yuan per kilowatt, regional subsidy 0.25 yuan per kilowatt, average electricity price for business us 1 yuan per kilowatt. A PV system of 120,000 yuan will recover the cost in 6 years, total profit of 25 years will be 880,000 yuan.