The article analyses the EU activity in assisting developing countries to develop energy sector throughperspective of the functional approach. The author identifies the EU approach by assessing EU compliance with the G8 commitments on assisting developing countries to develop energy sector. The assessment is made on the basis of the analysis of EU implementation of its commitments made in four major spheres of international engagement for energy development, such as ensuring developing countries’ access to modern energy sources, clean energy development, raw natural energy resources, sustainable management and environmental protection. In order to ensure comprehensive and unbiased assessment the author applies the methodology of global governance delivery function approach and compares EU compliance with compliance of other traditional donors such as USA and emerging donors such as Russia. In conclusion some recommendations on how to raise effectiveness in assisting developing countries to develop energy sector are made for the Russian Federation.