The method of the analysis of efficiency of use of investments for increase of continuity of electricity supply for customers is offered. The use of coefficients which are identical to product of average specific financing of investment programs with taking into account of standard units of electric equipment and a target System Average Interruption Duration Index in a method of the comparative analysis of efficiency of use of investments is offered. The calculation of factors of an inefficiency of use of investments for increase of continuity of electricity supply of customers which are in rural and city areas is offered. It is offered optimization model of efficiency of use of investments for increase of continuity of electricity supply of customers. The example of practical application of the offered method for definition of companies with inefficient use of investments for increase of continuity of electricity supply of customers in rural and city areas is given. The rank of companies which are chosen for research, by efficiency of use of investments for increase of continuity of electricity supply for customers is determined. Application of this method for the analysis of efficiency of use of investments in the sub-units of the companies and for the use of the calculated coefficients as Key Performance Indicators and corresponding stimulation of sub-units of the regulated companies to more effective use of investments is offered. Conclusion that in sub-units of the regulated companies which are certain as such where inefficiently use investments, on the basis of the analysis of the organization of technical operation and quality of performance of works, uses of modern technologies of repair and maintenance service of an electric equipment, improvement of professional skill of the personnel, and, using corresponding provision of economic incentives, probably to reach increase of continuity of electricity supply of customers is given.