A research team from the Polytechnic University of Madrid (UPM) and the Madrid Subterra Association is studying the feasibility of using unconventional energy sources, such as residual heat from subway stations, tunnels, and water conduits, to improve the energy efficiency of cities. Their research indicates that energy from household wastewater can save more than 50% on heating bills and that the residual heat from small subway stations could provide hot water for over 1,000 people for a year. Carbon dioxide (CO2) emissions from human activities have devastating effects on the environment and people, especially those involving the burning of fossil … Continue reading Heat from Below: How Madrid’s Metro Could Cut Heating Costs by 50% for Thousands