Britain's energy prices have fallen below zero as Storm Amy arrives with high wind speeds this weekend. While the exact track and intensity of the storm is uncertain, energy prices are on track to settle below zero for a full day, the first time since 2023. Surfers won't be the only ones taking advantage of stormy weather this weekend, some households will pay nothing for electricity. As renewable energy outstrips demand on the national grid, energy prices turn negative. Most households will not benefit from negative energy prices because their energy has already been bought, either via a fixed deal or a standard variable tariff, set by the energy price cap.