Rising rate of MSW generation and unscientific disposal in the open dumping sites are responsible for emission of high concentrations of methane in developing countries. IPCC Default method (DM), First-order decay (FOD) and LandGEM were used to estimate methane emissions from the unengineered landfill sites of Delhi-Okhla, Bhalswa and Ghazipur between 1984 and 2015. During the period, the total CH4 emissions was found to be 1288.99, 311.18, 779.32 Gg from the 3 landfill sites of Delhi as predicted by DM, FOD and LandGEM respectively. The energy generation potential from methane for the year 2015 was found to vary from 4.16 x 10(8) to 9.86 x 10(8) MJ for Ghazipur, 2.08 x 10(8) to 4.06 x 10(8) MJ for Okhla and 3.42 x 10(8) to 8.11 x 10(8) MJ for Bhalswa. Efficient utilization of methane from the landfills as an energy source can be a sustainable waste management option.