A number of swimming pools are reported to be using geothermal energy; however, no estimates of energy use were made. Attempts are being made to visit these remote sites and determine the energy data (Lagos and Gomez, 2010). In the WGC2000 paper (Castillo and Salgado, 2000) and reported for WGC2005 (Lund et al., 2005) three pool sites (Tamara, Gracias 1 and Gracias 2) were being heated by geothermal water. A total of 0.7 MWt of installed capacity and 17.0 TJ/yr of utilization were reported. Recent communications from Lagos (2009) indicated that the two major pool sites are estimated at 1.933 MWt – thus, one of the authors (Lund) estimates the annual energy use at 45.0 TJ/yr.