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Gas prices have soared on concerns over energy supplies after Russia announced it would not reopen its main gas pipeline to Europe.
The Dutch month ahead wholesale gas price, a benchmark for Europe, was up as much as 26% on Monday, before falling back slightly.
The same gas price contract lost 37% last week.
The Nord Stream 1 pipeline had been due to reopen on Saturday after being shut for three days.
However, on Friday, state energy firm Gazprom said it had found a leak in the pipeline.
Europe has accused Russia of using gas supplies to blackmail Europe amid the Ukraine conflict, which Moscow denies.
Although the UK is not reliant on Nord Stream 1 for its gas, the recent increase in the cost of wholesale gas has been behind the spiralling rise in the energy price cap for consumers.
Tory leadership hopeful Liz Truss has promised to announce a plan to deal with soaring energy costs within a week if she becomes prime minister on Tuesday. Her rival, Rishi Sunak, has said he will target further payments aimed at the poorest.
However, UK businesses are not protected by a price cap and, last week, the British Chambers of Commerce warned firms would "close their doors this winter" if they were not given support with soaring bills.
A number of European governments have revealed plans to help businesses and consumers cope with surging energy costs. On Sunday, Germany announced a €65bn (£56.2bn) package which includes one-off payments to the most vulnerable and tax breaks to energy-intensive firms.
Over the weekend, Sweden and Finland also announced multi-billion pound packages to support energy companies.
Oil price cap
Moscow has denied using energy supplies as an economic weapon against Western countries supporting Ukraine.
It has blamed the sanctions for holding up routine maintenance of Nord Stream 1, but this is disputed by the European Union.
The introduction of a price cap means countries that sign up to the policy will be permitted to purchase only Russian oil and petroleum products transported via sea that are sold at or below the price cap.
But Russia says it will not export to countries that participate in the cap.
The Nord Stream 1 pipeline stretches from the Russian coast near St Petersburg to north-eastern Germany and can carry up to 170 million cubic metres of gas a day.
It is owned and operated by Nord Stream AG, whose majority shareholder is Gazprom.
This is not the first time since Russia's invasion of Ukraine that the pipeline has been closed.
In July, Gazprom cut off supplies completely for 10 days, citing "a maintenance break". It restarted again 10 days later, but at a much reduced level.