> As a fossil fuel comparison, Gas costs about £114 per MWh.

You're comparing the cost for coal as baseload to the cost for natural gas as a peaker plant. When using both for baseload, natural gas is cheaper than coal and emits less CO2.

Meanwhile renewables are cheaper than both until they represent enough of the grid that you have to contend with intermittency:

https://www.ourworldofenergy.com/images/electrical-power-gen...

Which doesn't happen until it gets close to being a majority of generation, and which most countries aren't at yet so can add more without incurring significant costs for firming.

In other words, the currently cheapest way to operate a power grid, if that's all you care about, is to have something like half renewables and half natural gas. Add some nuclear -- even just, don't remove any -- and CO2 goes down by a lot because then you're only using natural gas for peaking/firming instead of baseload, while still having costs in line with historical norms.

The obviously bad thing many places are doing is shutting down older power plants without building enough new capacity in anything else to meet existing demand, and then prices go up. But that's not because you're using e.g. solar instead of coal, it's because you're trying to use demand suppression through higher prices instead of coal. It's easy to get rid of coal as long as you actually build something else.