A view of Cologne Cathedral after lights were switched off as an energy-saving measure, in an effort to reduce dependence on imported natural gas from Russia in Cologne, Germany, on September 01, 2022. Measures include turning off lights on public monuments between 10 pm and 6 am. Public buildings will not be heated more than 19 degrees Celsius, and hot water will be switched off in these buildings, with the exception of hospitals and social facilities.