I have analyzed the major activities carried out for geothermal electricity generation since WGC2010. New data has been taken from WGC2015Country Update reports, private communications from IGA members and Affiliated Organizations, and I would like to acknowledge all IGA friends for their valuable help. Other updates have been collected from websites of private and public organizations involved in geothermal development. Plants under construction, which are expected to be commissioned in 2015, are included in the installed capacity. An increase of about 1,8 GW in the five year term 2010-2015 has been achieved (about 17%), following the rough standard linear trend of approximately 350 MW/year, with an evident increment of the average value of about 200 MW/year in the precedent 2000-2005 period (Bertani, 2005a,b, 2006, 2007, 2010, 2012; Bertani et al., 2013). (C) 2015 Elsevier Ltd. All rights reserved.