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'Mostly' isn't true over the last decade which is the period of the most recent big shift from Coal.

That graph shows gas is the most used fuel in the UK for all years since coal was the most

Mostly replaced implies >50% which is not the case. Gas is the most used fuel but has not 'mostly replaced' coal.

It's approx 50%, and it's more than any other.

1991 Coal 62% Gas 1.72% 2023 Coal 1.28% Gas 31.71%

So Coal dropped 60.72, Gas rose 30, oh no, it's slightly less than 50%, my point is invalid