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Encouraged by the global strategy of promoting distributed generation (DG), unregulated integration of DG into the distribution network created a number of problems in the distribution network. The article elaborates new conditions in the network as a consequence of DG integration and highlights the problems caused by DG. The paper discusses impacts of DG on power flows and voltages in the distribution network. The purpose of the article is to examine the possibilities of regulating the optimal integration of distributed generation in distribution network without the smart grid. The concept for the prevention of negative consequences of DG integration is proposed. The article indicates that, if properly managed and coordinated, DG integration can reach the sustainable level of acceptance in the distribution network, without the risk of endangering the integrity of the distribution network. The proposed solution is based on the systematic multidisciplinary approach to the integration of DG into the distribution network. The precondition is the cooperation between responsible energy entities: the electricity producer and the distribution system operator (DSO), supervised by the independent national regulatory authority. The goal is to organize a regulated DG integration that will provide a positive DG contribution to the distribution network and to DG itself.