Europe's wholesale natural gas prices fell on January 2 to their lowest level since Russia invaded Ukraine, which had driven them to a record high last year. A mild winter has enabled countries to tap less gas from stocks that were built up in anticipation of cuts in supplies from Russia, which was Europe's main supplier before the war. European countries filled up their gas-storage facilities and launched campaigns to encourage consumers to save on energy during the winter. Experts have warned that a cold snap could still send gas prices rising again.