The mess of energy policy and climate change policy would be laughable if it were not so catastrophically serious.
In the next 30 days the UK electricity system usually sees its maximum annual demand. This usually coincides with a period of high atmospheric pressure of the UK when the air is clear and there is no wind. Temperature drop precipitously as the clear sky allows heat to escape from the land surface. Gas and electric demand climbs rapidly as people switch on heating.
At this point, virtually no wind turbines are producing electric as there is no wind, 35 year old oil fired power stations are typically brought on line to meet demand.
Problem is the amount of subsidised wind power has severely curtailed investment in new gas fired power stations and most of the large coal fired power stations have closed in the last few years due to other regulatory measures.
On full load the existing power stations can meet peak demand - even without the wind turbines. However, if any power stations fail (as they often do) then the remaining power stations will be left increasingly struggling to meet demand. In certain circumstances natural gas demand may be so high that natural gas system line pack pressure could drop so much that gas turbine power stations begin to automatically disconnect (trip).
There is a non negligible risk that UK power stations will not meet demand in a sustained cold spell if there is no wind and there are failures. This will force the National Grid to call on industrial users to interrupt consumption. In other words shut down UK industry.
That is where renewables policy has taken us to - potentially shutting down UK industry to avoid a blackout.
If demand continues to climb or if industry doesn't switch of demand quickly enough there will definitely be a blackout. The National Grid can order power stations to go to MaxGen but that gives us approximately 15 - 30 minutes of running power stations at above normal capacity before turbine blades begin to melt and bearings start to overheat. During that time, the grid has to be shut down in an orderly way before it becomes unstable but even then the grid will be under such strain it is at 2 seconds notice from an uncontrolled blackout if any one of the remaining power stations fail.
If there are blackouts then public opinion will swing against renewables and the climate change policy very quickly.