The beauty of a district energy system is that since it serves so many customers from one location, it can accomplish things individual buildings usually cannot. For instance, district energy systems can use a variety of conventional fuels, based on their availability, such as coal, oil and natural gas, whichever fuel is most competitive at the time. And because of a district energy system's size, the district energy plant can also transition to use renewable fuels such as biomass, geothermal, and combined heat and power. Buildings connected to district energy systems also have lower capital costs for their energy equipment because they don't need conventional boilers and chillers. They save valuable upfront dollars they can invest elsewhere. Plus, they save building space that can be used for other more valuable purposes.