Some states have made solar plants mandatory in the industrial sector. In these, you can start the business of Solar PV, Solar Thermal System, Solar Attic Fan, Solar Cooling System. These days, many of these products are in demand and are powered by solar energy. Domestic and foreign companies manufacture solar mobile chargers, solar water heaters, solar pumps, solar lights. Some of these products, such as the water heater and the pump, also get subsidies from the central and state government. You can also start the business of these products. It will cost 1 to 2 lakh rupees to start this business. Loan facility is also available in banks. Companies can earn between 20 and 40 thousand rupees per month.