A new methodical approach to assessment of contributions of individual branches of power industry into power security is proposed. The approach is based on determining of specific rates of the branch in the indicative rates structure of power security. The indicative rates structure is determined. It is shown that to solve the problem set they must have synthetic character. The notions of potential contribution of an industry and contribution into creation of a crisis situation as well as direct and indirect contribution are introduced. Formulae for calculation of contributions are given. The methodology is implemented at the example of determining the contributions of the gas industry to power security of the selected entity of regions of Russia.