[en] Ways of increasing economic efficiency of district-heating nuclear power plants (DHNPP) operating in isolated systems of power-supply and district-heating and incorporated in control over the schedule of power loading are analyzed. Prospective advantages of using systems of heat accumulation in DHNPP of the considered type is proved on the example of ''Sever-2'' DHNPP. It is concluded that heat accumulation under conditions of DHNPP autonomous operation would permit to generate additionally an essential quantity of electric power and would assure essential economic efficiency