The International District Energy Association (IDEA) is a nonprofit industry association that is committed to building a faster path to net zero by advancing district energy, an emission-friendly, cost-effective, reliable and efficient energy system. IDEA has more than 2,500 members from over 25  countries that provide heating and cooling services to as many as 200 buildings in a district, serving cities and municipalities, college and university campuses, healthcare facilities, airports, military bases and industry around the world. IDEA was founded in 1909.