Based on his estimate, approximately 7,500 geothermal heat pumps units were sold in 2008, or about 40% more than 2007 with a total energy supply of 1 to 2 TWh/yr. Based on the EurObserv’ER 2009 report, the estimate is that 46,412 total units were installed by 2008 for a capacity of 857.9 MWt and the total units installed between 2007 and 2008 was 7,500 units (which is only a 19% increase). Based on data from the WGC2005 world report (Lund, et al., 2005) the number of full load hours annually is 4,000 with an average COP of 3.1.

Thus, based on the EurObserve’ER numbers, the annual energy use would be 8,370 TJ (2,325 GWh/yr) which is slightly higher than Jarmo’s estimate, but is the one that will be utilized.