A method of controlling energy supply in an energy distribution network is disclosed. The energy distribution network comprises an energy generation facility adapted to supply energy to the energy distribution network and an energy consumer adapted to consume energy from the energy distribution network. The method comprises, at the energy generation facility: detecting a curtailment condition, the curtailment condition indicating that the energy generation facility should curtail its supply of energy to the energy distribution network; in response to the curtailment condition, transmitting, via a communications link, a request to increase energy consumption to the energy consumer; receiving a reply message from the energy consumer via the communications link; and controlling energy output from the generation facility in dependence on the reply message.