Q3 2023: Capacity and production statistics

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Gas-fired power stations produced 20 TWh over the three months to September, down one-third on the same time last year. At the same time coal generation fell by more than half to under 0.5 TWh.

The weather was one driver of these falls, as a cooler summer and milder September contributed towards demand falling by 5%, and higher wind speeds pushed offshore wind output up by a third to deliver 9 TWh over the quarter.

While nuclear output was down again on last year, it is showing signs of recovery. Output in September was 10% higher than in the same month last year.

Power prices continued falling, averaging £77/MWh over the third quarter, down 12% on quarter 2. However, balancing prices edged upwards toward record levels, averaging just under £12/MWh (15% of the wholesale price). This is six times higher than the £2.10/MWh average seen during the 2010s.

Britain’s electricity supply mix in the third quarter of 2023

Installed capacity and electricity produced by each technology 1 2

1 Other sources give different values because of the types of plant they consider. For example, BEIS Energy Trends records an additional 0.7 GW of hydro, 0.6 GW of biomass and 3 GW of waste-to-energy plants.
These plants and their output are not visible to the electricity transmission system and so cannot be reported on here.
2 We include an estimate of the installed capacity of smaller storage devices which are not monitored by the electricity market operator.

Live Grid Data