Switzerland’s final energy consumption rose slightly in 2025 compared to the previous year, by 0.2% to 777,870 terajoules (TJ). + Get the most important news from Switzerland in your inbox The main reasons were the colder weather compared with the previous year and the increase in aviation fuel sales. The number of heating degree days rose by 5.6% compared with the previous year, the Swiss Federal Office of Energy announced on Thursday. Other factors that determine the long-term upward trend in energy consumption have also risen. These include the permanent resident population, economic output, the number of motor vehicles and the housing stock. Compared with the previous year, sales of aviation fuels rose by 3.2% and are now just below the highest consumption level recorded in 2018. Petrol and diesel sales, on the other hand, fell by 1% overall. According to the latest figures, fossil fuels account for approximately one third of total final energy consumption. Consumption of …