Introductory part. Types of costs and fundamentals in engineering economics. Forecast of energy consumption and distribution system power. Technical and safety criteria in planning of distribution systems of networks. Planning process of distribution systems – planning problem identification, planning goals determination, various variations identification, selection of the best variation (development plan). Static and dynamic approaches (models) in distribution systems planning. Planning of new supply transformer stations. Planning of middle voltage distribution network. Planning of secondary distribution transformer stations and low voltage networks. Planning of distribution system development in deregulated power systems. Impact of distributed sources and load management on planning of distribution systems. Uncertainty in planning of distribution systems. Tools and approaches for risk management. Tools, approaches and methods for planning of distribution networks development in the case of uncertainty.