Cost of balancing the grid
Every day the system operator, NESO, pays power stations, batteries and others to keep supply and demand matched and the network within its limits. These costs end up on everyone's bills.
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Network constraints
Constraint costs often come from the network not being able to carry all the power from where it is made to where it is used, for example wind power from Scotland at windy times. NESO then pays some generators to make less and others, nearer the demand, to make more. The renewables page breaks constraint costs down further, using NESO's constraint breakdown data.