I don't know who statista are but their figures seem to be wrong. However I also must have misremembered. So it seems we were both wrong: The UK government says

I don't know who statista are but their figures seem to be wrong. However I also must have misremembered. So it seems we were both wrong: The UK government says it is similar now (256983 GWh) compared to 1970. (214426 GWh) having peaked in 2003 (342308 GWh) https://www.gov.uk/government/statistical-data-sets/historical-electricity-data https://www.gov.uk/government/statistical-data-sets/historic...