Less garbage piling up in landfills near Gurugram, Faridabad, Ambala and Hisar — and the same waste turned into cooking and vehicle fuel plus electricity for the grid. Four Haryana cities currently send most of their waste to landfill. OIL Green Energy, a wholly owned subsidiary of Oil India, has signed MoUs with the municipalities of Gurugram (2,000 tonnes per day), Faridabad (1,600 TPD), Ambala (900 TPD) and Hisar (500 TPD) to build integrated compressed biogas and waste-to-energy plants.