A method and a system for control of a district heating substation (10) having a primary supply line (14) for receiving, from a district heating plant, a heat carrier having a primary supply temperature, and a primary return line (15) for returning, to the district heating plant, the heat carrier with a primary return temperature, the substation comprising a heat exchanger (11 ) having a primary side (12) connected between the primary supply line and primary return line, and a secondary side (13) connected to a heat distribution system. A relationship between primary supply temperature and desired secondary supply temperature is stored, a set point value for secondary supply temperature is determined based on a detected primary supply temperature, and the secondary supply temperature is controlled according to said set point value, by regulating the primary side flow. The present invention is based on the realization that the secondary supply temperature is not subject to any significant variations due to realistic load variations with constant primary supply temperature. Therefore, the substation control may be based on primary supply temperature without negatively affecting the temperature drop ΔT.
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