 Well, district energy is really an underground infrastructure asset that combines the heating and cooling needs of dozens or hundreds or sometimes thousands of buildings, aggregates their heating and cooling loads, and then a central plant distributes steam or hot water or chilled water to each of the buildings so that they can avoid the capital costs of their own boilers and chillers, they have lower operating expenses, and so it's really a community energy system that links thermal sources with multiple users. The benefits of district energy in a community are that building owners are able to tap into a thermal network rather than having to own and operate their own boilers and chillers and cooling towers. It allows them to reclaim space that they would otherwise dedicate to that equipment. They get a flatter electric load profile, they avoid emissions, it essentially makes for a greener building because they're not producing their own heating or cooling. But more than that, having a district energy system in your community produces a scale of thermal energy use that then allows you to use things like ocean water for cooling, geothermal energy, waste energy from incineration, or even just waste heat from a power plant. So district energy creates an opportunity for greener, cleaner thermal and cooling sources. District energy is used right here in Washington D.C., the capital power plant supplies steam and chilled water to all the buildings on Capitol Hill. GSA operates a plant in downtown Washington, they serve about 100 federal buildings. So right here in the district, there are lots of district energy systems. In every major college campus in our country, from the Ivy League schools to the Big Ten, the Pac Ten, most large universities or colleges have a district energy system. Also, all of our major cities, New York, Boston, Philadelphia, San Francisco, district energy has been around for this country over 130 years.