• UKCS and Norway accounted for almost 70% of total supplies and provided steady supplies throughout the winter, with LNG and storage providing additional resilience.
• Analysis from National Gas shows demand for gas to generate power rose by 18% (1.4 bcm) in Winter 2024/25 compared to previous year.
• This increase in gas for power was a combination of cold weather and dunkelflaute, with a peak of 65% power from gas in December 2024.
• Exports to continental Europe fell 78% (1.3 bcm) as flows return to pre-2022 levels.

As part of its role as Britain’s national gas network operator, National Gas publishes a Winter Review annually. This year’s summary reveals the total demand on the National Transmission System increased, and the network continued to provide reliable, resilient and secure supplies.

Great Britain’s gas needs were met by a diverse and flexible range of supplies, with the UKCS and Norway meeting the majority of demand, with the remaining gap filled by LNG and supplies from storage. The overall increase in gas demand compared to last winter was largely driven by the greater use of gas in electricity generation.

A number of factors led to this rise – including a combination of colder weather combined with ‘dunkelflaute’ conditions, when there is little wind or sunshine to help generate renewable energy. UKCS and Norway accounted for almost 70% of total supplies and provided steady supplies throughout the winter. Imports from Europe, LNG and storage provided key flexibility during the winter ensuring the system remained balanced.

Glenn Bryn-Jacobsen, Director of Energy Systems and Resilience at National Gas, said:

“Our Winter Review highlights that the National Transmission System (NTS) continues to play a vital role in providing reliable, resilient, and secure energy.

"Great Britain benefits from diverse and flexible gas supplies. UKCS and Norway provided steady baseload supplies throughout the winter. LNG, imports from continental Europe and British storage all contributed to provide flexible supplies during the winter.

"With a near 20% increase in gas usage for power generation, including one of the highest days on record, the gas network continues to respond to complement intermittent renewable power output.

“The role of the NTS will continue to evolve as Great Britain’s energy mix changes, providing a critical source of flexibility and security within a low-carbon energy system.”

Great Britain has a diversified supply mix. Alongside domestic supply, the country is connected by pipelines to the Norwegian system and has interconnectors with the Netherlands and Belgium. Great Britain can also access global markets via three LNG terminals, which import gas from around the world.

The Winter Review analysis reinforces the key role gas continues to play in keeping homes warm and supplying energy to businesses, major industries, and power stations. It is critical in providing flexibility and resilience to the electricity system to complement renewables.

All of this is set out in our Gas Winter Review 2024/2025 report here and our summary document here.