Great Britain’s energy system operator has warned of potential “tight days” this winter.

The National Energy System Operator (Neso) indicated that imported electricity from Europe could be used “when required” to power homes and businesses.

This outlook follows the publication of the latest winter energy reports by Neso and National Gas, after a rise in the price cap led to a surge in costs.

Neso stated on Thursday that electricity margins, reflecting the cushion of spare power supply, have risen to their strongest level since 2020.

However, it added that there could still be some “tighter periods”, which might need support from the energy industry.

“We expect a sufficient operational surplus throughout winter, although there may still be tight days that require us to use our standard operating tools, including system notices,” the report said.

System notices are how the grid operator informs the wider energy industry that electricity supply has not matched demand, allowing for production to increase if needed.

Early data from electricity firms and forecasters has suggested that “tight days” are most likely to take place in early December or mid-January.

Neso added that imports will be available when needed to help cover demand, supported by “adequate electricity supply across Europe”.

Deborah Petterson, director of resilience and emergency management at Neso, said: “A resilient and reliable energy supply is fundamental to our way of life.

“At Neso, we are looking at the upcoming winter and can report that this year’s winter outlook sets out the strongest electricity margins in six years.

“It is critical that we continue our work with the wider energy industry to prepare for the coming months to build on this foundation and maintain our world-leading track record of reliability.”

Meanwhile, the latest analysis from National Gas indicated that Great Britain has enough gas supply capability to meet peak demand.

It indicated supply can meet demand, “even accounting for unforeseen network outage scenarios”.

The gas network operator said gas demand is expected to be 3 per cent lower than last winter, easing pressure on supply.

It said high-demand days are still expected, but it stressed that it is “confident” the market will operate as needed.

Glenn Bryn-Jacobsen, director of energy systems and resilience at National Gas, said: “As we head into winter, we remain confident in the resilience of our gas system and our ability to meet Britain’s energy needs during periods of peak demand.

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“The energy landscape is evolving, with a growing reliance on imports and the continued decline of UK continental shelf supplies.

“Meeting these challenges requires a coordinated, forward-looking approach, and we’re working closely with government, industry, and regulators to develop the right solutions that safeguard security of supply for the future.”

But the report from National Gas shows a fall in Britain’s gas storage capabilities, thanks to the Rough storage site off the coast of Yorkshire no longer storing gas, which means there is an increased reliance on importing liquified natural gas (LNG) to plug the gap in times of high demand.

The facility in the North Sea is the largest of its kind in the UK, but owner Centrica has stopped filling it with natural gas amid concerns over its financial viability.

The Rough site comprises about half of Britain’s storage capacity, and acts as a buffer when the weather is especially cold and demand for gas spikes.

Centrica has long warned it will be decommissioned without government support to allow investment in the site.