179. District Energy Systems: The Invisible Giant of Urban Efficiency

District energy systems employ a centralized facility to supply heating, cooling, and sometimes electricity for multiple buildings in an area through a largely underground, mostly unseen network of pipes. When district energy systems are utilized, individual buildings do not need their own boilers, chillers, and cooling towers. This offers a number of benefits to building owners and tenants. Among them are: • Energy Efficiency. Centralized heating/cooling is more efficient than individual building systems, reducing energy use by 30% to 50% in some cases. • Cost Savings. Lower operations and maintenance costs through economies of scale and reduced equipment needs per building. • Reduced Environmental Impacts. Emissions are lessened and renewable energy resources can often be more easily integrated. • Reliability. A more resilient energy supply is often provided, with redundant systems and professional operation. • Space Optimization. Buildings need less mechanical equipment, freeing up valuable space. The concept is far from new. In fact, Birdsill Holly is credited with deploying the U.S.’s first district energy system in Lockport, New York, in 1877, and many other cities incorporated district systems into their infrastructure soon thereafter. While district energy systems are particularly effective in dense urban areas, they’re also widely used at hospitals and at other large campuses around the world. “There’s over 600 operating district energy systems in the U.S., and that’s in cities, also on college and university campuses, healthcare, military bases, airports, pharma, even our sort of newer industries like Meta, Apple, Google, their campuses are utilizing district energy, because, frankly, there’s economies of scale,” Rob Thornton, president and CEO of the International District Energy Association (IDEA), said as a guest on The POWER Podcast. “District energy is actually quite ubiquitous,” said Thornton, noting that systems are common in Canada, throughout Europe, in the Middle East, and many other parts of the world. “But, you know, not that well-known. We’re not visible. Basically, the assets are largely underground, and so we don’t necessarily have the visibility opportunity of like wind turbines or solar panels,” he said. “So, we quietly do our work. But, I would guess that for the listeners of this podcast, if they went to a college or university in North America, I bet, eight out of 10 lived in a dorm that was supplied by a district heating system. So, it’s really a lot more common than people realize,” said Thornton.