Gradual formation of the common energy markets of the Eurasian Economic Union includes development and coordination of indicative (forecast) balances of gas, oil, and oil products of the union. The common energy market is formed step by step on the basis of electric power systems operating in parallel. The Treaty on the Eurasian Economic Union also provides for development of concepts and programs for the formation of the common energy markets. Upon completion of activities under the programs, the parties shall conclude international treaties: on the formation of a common electric power market, which shall include, among other things, uniform rules for access to services of natural monopoly entities, on the formation of a common gas market containing, among other things, uniform rules for gas transmission systems located in the territories of the member states, and on the formation of common markets of oil and oil products containing, among other things, uniform rules for access to the systems for transportation of oil and oil products. Certain work has already been done. The member states have currently developed and ensured approval by the Supreme Eurasian Economic Council of the Concept for the Formation of a Common Electric Power Market; the Concept for the Formation of a Common Gas Market, and the Concept for the Formation of the Common Markets of Oil and Oil Products. One of the most difficult tasks for preparation of relevant international treaties is to handle work on unification of uniform rules for access to services of natural monopoly entities. It should be taken into account that national legal regulation of relations concerning transmission and transportation of energy resources of the member states is different. For the development of uniform rules, thorough legal analysis of the laws of the member states of the Union and determination of the best provisions for incorporation into the uniform rules will be required. The article outlines possible pro- visions for incorporation into the uniform rules for access to the gas transmission systems that can also be included into the uniform rules for access to the systems for transportation of oil and oil products and used upon development of the uniform rules for access to services of natural monopoly entities in the electric power industry.