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Electricity is not the same thing as energy. Most energy use in the UK is going to be heating and transportation which are both overwhelmingly fossil fuel based.

And a large amount of transport energy is moving oil and coal.

"Nearly half of freight-rail transportation is used to move coal—most of the other half is wheat and food. A not-so-surprising revelation from a close study of the Sankey diagram: our fossil-fuel supply chain is itself a major consumer of fossil fuels." (Saul Griffith, Electrify: An Optimist's Playbook for Our Clean Energy Future)

Not in the UK - both coal production and coal power generation have been aggressively phased out over the last 50 years. (And natural gas - which has replaced it - flows through pipes, mostly.)

In the last year: renewables provided up to 60% of electricity generation, with an average of 30%. https://gridwatch.co.uk/renewables/percent

We’re also running gas plants more than normal for this time of year and exporting the electricity generated to mainland Europe as our gas interconnecters can’t keep up with demand