This is the best tl;dr I could make, original reduced by 77%. (I'm a bot)

> The UK's electricity grid ran on 100 per cent clean power for 25 hours during December, setting a new monthly record and providing further evidence that the energy system can enable a zero-emission grid.

> The record-breaking performance during December meant there were nearly 100 hours when the grid delivered more clean power than it needed last year.

> The report acknowledged that some fossil fuel generators were required to stay running in order to provide flexibility and inertia services to grid operator National Grid ESO during the periods when demand was fully met by clean sources of power.

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