The UK issues a power supply warning as a heatwave leads many people to increase their use of fans and air conditioning. Multiple reports say temperatures are expected to reach around 40°C in parts of England and Wales during Wednesday and Thursday, raising concerns about higher electricity demand. The warning is aimed at encouraging consumers to use power responsibly during the hottest periods, when demand can rise quickly due to widespread cooling use. The forecasts indicate the most intense conditions are concentrated in specific areas rather than uniformly across the whole country. With extreme temperatures predicted over consecutive days, utilities and authorities urge the public to be mindful of energy consumption to help maintain network stability. The reports frame the heat as a short-term weather event with potentially significant impacts on everyday electricity use, while stopping short of specifying any outages. Overall, the coverage focuses on the combination of very high temperatures and increased cooling demand, prompting guidance related to power use during peak heat.