Mongolia has been achieving stable economic growth over the last 10 years. This has resulted in a significant increase in energy consumption, especially conventional energy, such as coal, oil, and electricity. The Mongolian Energy Economics Institute (MEEI) requested the Economic Research Institute for ASEAN and East Asia (ERIA) to support the MEEI in producing energy efficiency indicators (EEIs) to serve as benchmarks for Mongolia’s final energy consumption sectors and to improve current energy efficiency and conservation (EEC) policies and action plans. This report comprises a detailed methodology and calculation results of those indicators in industry, transport, commercial buildings, and the residential sectors of Mongolia.