UK wind farms hit a new generation high of 15GW on 18 December, according to National Grid figures highlighted by RenewableUK.
The new record was set between 11.15am and 12.15pm and delivered 34.7% of UK electricity needs.
The previous high of 14.9GW was set on 28 November between 6pm and 6.30pm.
R-UK said 2018 had been a year of records in the country, including over 2GW of offshore wind installed and the world’s largest offshore wind farm, 659MW Walney 3, coming online.
R-UK executive director Emma Pinchbeck said: “Setting a new wind energy generation record in December is a great Christmas gift in an exceptional year for the UK’s world-leading renewable energy industries – we’ve smashed record after record.
“In the years ahead, the electricity system will be smarter and cleaner for people. Like the Ghost of Christmas Future, 2018 has shown us portents of a new type of energy system led by renewables.
“In the present, we’re celebrating the fact that UK wind and marine energy are keeping the Christmas tree lights on”.