Russia's Gazprom said European natural-gas prices could gain another 60% this winter.
European gas prices have been breaking record highs recently on the supply crunch.
"European spot gas prices have broken through $2,500 (per 1,000 cubic metres).
According to conservative estimates, if this trend continues, prices will exceed $4,000 per 1,000 cubic metres this winter," Gazprom said in a statement on Telegram on August 16.
European benchmark Dutch wholesale natural-gas prices hit a record high of nearly 335 euros, or $341, per megawatt hour in the spring this year, according to Reuters.