In the UK, production of electricity is not controlled by National Grid. They are basing their claim that everything will be fine on forecasts and targets, e.g.

In the UK, production of electricity is not controlled by National Grid. They are basing their claim that everything will be fine on forecasts and targets, e.g. targets for offshore wind which were set by the government. Delivery is down to private companies in auctions. I don't know what the current situation is but the September 2023 auction notoriously attracted no bid. There is zero guarantee that any targets will be met as things stand.