The transition to the market orientation from the centralized economy, which started from 1990s, brought a great deal of important changes in Mongolian economy. Implementation of policies on market liberalization, promotion of free market and fair competition and privatization of state managed assets enabled the development of private sector and creation of legal entities in various forms such as privately owned companies, joint stock and state owned enterprises operating on the market. By February of 2024, there are 26 state owned companies (SOC) operating in energy sector of Mongolia, among over 100 fully or partially state owned companies that are involved in strategic sectors such as energy, mining, communications and transportation. Being fundamental to the national security and overall socio-economic stability of the country, the energy sector is necessarily considered to be developed ahead of other sectors and hence, this research is focused on the comprehensive valuation of performances for state owned energy manufacturing and transmission companies of Mongolia. Main research subjects are 26 State Owned Companies (SOC) operating in energy sector of Mongolia.