The warming notification for Drax units 5 and 6 and a unit at West Burton is part of the winter contingency contract the ESO has negotiated following a request from the government.
The coal plants will prepare to operate if required as temperatures dip below zero and demand soars.
However, a few hours later, the ESO stood down these two power stations as there were other sources that could meet Britain’s energy needs.
On Sunday morning, National Grid ESO stated: “This morning we have issued a notification to warm the winter contingency coal units.
This measure should give the public confidence in Monday’s energy supply. This notification is not confirmation that these units will be used on Monday, but that they will be available to the ESO if required.
“The ESO as a prudent system operator has these tools for additional contingency to operate the network as normal and the public should continue to use energy as normal.”