A nationwide shift to LED lightbulbs could slash the risk of a winter blackout, according to new research from Greenpeace. The research, carried out by energy analyst Chris Goodall, found a switch to the energy efficient LEDs in homes would reduce peak electricity demand in the winter by five per cent, or 2.7GW. The study also calculates the use of LEDs in office and other commercial building could save around 4.5GW, around nine per cent of peak demand, while LED street lighting would save a further 0.5 GW. While lighting might not seem an area of high energy demand, it is responsible for nearly a third of total winter peak electricity demand, according to the research. It calculates that a complete switch to LEDs would likely halve power use from lighting. Greenpeace said the research shows a business and government drive to promote a switch to LEDs could see a reduction in the UK’s electricity demand equivalent to over two Hinkley Point nuclear plants’ worth of electricity. Greenpeace estimates it would currently cost around £1.7bn to switch the most used bulbs in all UK homes to energy-efficient LED lighting, adding that the transition could be completed “relatively quickly”. The payback period for switching the most used lighting typical domestic house to LED is two to three years at current prices, with the estimated £62 cost of replacing 21 bulbs in living areas likely to cut annual electricity bills by at least £24, Greenpeace said. However, the new analysis also shows that in addition to helping cut domestic energy bills a national switch to LEDs would help save at least £65m a year on capacity market payments, reducing the subsidies the government pays for back up power capacity.