[GaurVimen]

"Ministers expect that, before long, wind energy will operate without support."

Not when there is a anti-cyclonic high pressure system anchored over the UK and the wind isn't blowing. No wind, no turbine rotation and no electricity.

[ChrisSD]

If the wind falls below 2.5 m/s across the entirety of Britain's coast... that would be an unusual event to say the least. But in the incredibly unlikely event that happens, the UK can buy electricity from the continent (and vice versa). This already happens today with non-renewables.

If the wind stops blowing across a significant area of Northern Europe then something has gone seriously wrong with the Earth.