The use of geothermal and other renewable energy technologies is considered to be a relatively recent practice. There are examples, however, of visionary individuals developing alternate energy systems years or even decades ahead of most of the HVAC community. Geothermal district heating is one example with the first system established in Boise, ID, in 1892. Such early use of this now widespread resource is surprising. More impressive is the fact that this system is still in operation--a century later. It's success has spawned the development of 17 other geothermal district systems throughout the western U.S. and dozens more internationally. Interestingly, the pioneer developers of the Boise Warm Springs Water District system encountered the same issues we address today in district systems: marketing, rate structure, metering and hardware problems