This article analyses key notion in the field of energy economy: (energy efficiency). The current state of the gas transportation system of LLC «Gazprom Transgaz Ukhta» were deter-mined. A calculation methodology of energy efficiency of long-distance gas transmission as a capital investment project was improved. An input method was used to calculate capital investments in fuel gas consumption reduction. Using a scoring system adopted in the world’s and na-tional practical experience, energy efficiency of gas–saving measures was calculated and sensitivity analysis of these measures was carried out taking into account the risks identified.