[en] The experience of development of reactor plants in Russia has demonstrated that the optimum structure of the nuclear power industry shall combine fast reactors that would generate power and breed fissile material and thermal reactors performing functions of regulation and co-generation of electricity and high-temperature heat for industrial and process purposes. A promise offered by the use of gas cooled fast breeder reactors (BGR) in the nuclear power industry is shown. The Russian experience in developing BGR is discussed. Advantages of BGR over liquid metal cooled fast reactors are presented. Possibilities for improvement of breeding of fissile material in BGR through the use of denser fuel compared to oxide fuels, namely carbides and nitrides, are considered. Based on the previously obtained experience, a conclusion is made that development and use of high-temperature gas cooled thermal (HTGR) and fast (BGR) reactors shows promise for the nuclear energy of the 21- century