Vivaan Solar has won bids to develop 0.5 MW of rooftop solar projects at the Rail Spring Factory, Gwalior, Madhya Pradesh. The project was tendered on a design-build-finance-operate-transfer basis. The company won the bid quoting the lowest tariff of Rs 5.74 per kW. After Delhi-NCR, Bengaluru and Jhansi, this is the fourth time that Vivaan has won a rooftop solar project for Indian Railways.