When using the electrothermal consumers-controllers (ETCC) in distric heating (DH) systems for frequency control, and for active power it is important to know their power during the heating and non-heating seasons and dependency of such power on the ambient temperature. Currently these issues are not studied completely that can be an obstacle to mass adoption of ETCC in DH systems. Total capacity of standard heat generators and ETCC transferred to the networks is distributed as follows: one part of it is designed to compensate the losses, the second part - to compensate heat load of consumers, and the third part causes the heat energy accumulation, which circulates in the networks. The conducted studies have shown that during the heating season the value of accumulated heat in the networks is directly proportional to the ambient air temperature. This dependency is expressed by a piecewise linear function. When ambient air temperature is smaller than calculated one, accumulation in heat networks is impossible. This can be explained by the fact that the parameters of the heat carrier reached the maximum permissible values for safety operation of the network, all energy in the network compensates the heat load and losses. When increasing ambient air temperature, the accumulation potential increases reaching a maximum value at the culminating point of the temperature chart. During non-heating season the only load of DH system is hot water. Heat carrier consumption is 2 - 3 times smaller than during the heating season. Heat energy accumulation time in the networks coincides with time of minimum hot water distribution. In order to be withing the maximum heat carried temperature in the return pipeline heat energy can be accumulated at the expanse of increasing the heat carrier consumption at constant temperature in the supply pipline. The value of accumulated heat energy will be mach lower than during the heating season.

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