The top-to-toe modernization project offers an opportunity to study TENs as a way of cooling subway platforms and reusing the excess heat in nearby municipal buildings, which would lead to a long-term reduction of energy costs. “This would be the first thermal energy system of its kind in any American transit system, a historic feat that would not only help the city to save money and limit steam consumption but help us mitigate the extreme level of heat in our subway stations,” Mamdani said. “Working with Mayor Mamdani and the MTA, we are harnessing cutting-edge climate technology for a truly cool purpose: making our subway stations tolerable during the summer and heating critical city buildings during the winter.