Gosh. Who could’ve forseen that coming? (back in 2017)
Closure of UK’s largest gas storage site ‘could mean volatile prices’ | Centrica | The Guardian.
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Headline translation: Centrica - we haven’t done our job properly
Well … they were probably told not to invest further in the nasty planet destroying greenhouse gas supply, as we’d all be on heat pumps and solar but now😂
Trust they will prioritize keeping the gas powered electricity generators running over domestic gas boiler users 
So I guess you’re worried about keeping warm ?
In principle 40-50% efficient, before transmission losses. The cooling towers do heat the fresh air though, and maybe the nearby watercourse if that’s involved, and they may also vapourise water. And the warm grid wires heat the atmosphere too.
In principle burning the gas where the heat is needed in a modern (condensing) boiler could deliver almost all of that heat into the building.
If we need heat then thermodynamics says we should burn gas locally rather than turn it into electricity and use that for direct heating.
The exception is if we have a heat pump. Then the electricity can deliver a lot more than it’s own weight in heat.
Average for 2023 was 49.9% for all gas in the UK in 2023 per government stats, though higher amounts are being achieved.
Be interesting to see what it is at low tickover overnight.