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Some states have made solar plants compulsory in the industrial sector. You can start business of solar PV, solar thermal system, solar attic fan, solar cooling system. These days, many such products are in demand which run on solar. Domestic and foreign companies are making solar mobile charger, solar water heater, solar pump, solar lights. Some of these products like water heater, pump also get subsidy from the central and state government. You can also start a business of these products. Starting this business will cost 1 to 2 lakh rupees. Loan facility is also available from banks. You can earn 20-40 thousand rupees per month from this business.