| Country | Organization |
Period |
Members affiliated to IGA |
| Canada | Canadian Geothermal Energy Association |
2008-2010
|
25
|
| China | Geothermal Chinese Energy Society |
2007-2009
|
67
|
| Costa Rica | Geothermal Association of Costa Rica | 2008-2010 | |
| El Salvador | El Salvador Geothermal Association |
2008-2010
|
46
|
| Ethiopia | Ethiopian Geothermal Association |
2007-2009
|
45
|
| Georgia | Georgian Geothermal Association | 2007-2009 | 14 |
| Germany | German Geothermal Association - GtV |
2009-2011
|
752
|
| Hungary | Hungarian Geothermal Association |
2006-2008
|
96
|
| Hungary | Hungarian Thermal Energy Society |
2006-2008
|
50
|
| Iceland | Geothermal Association of Iceland |
2006-2008
|
108
|
| Indonesia | Indonesian Geothermal Association |
2006-2008
|
99
|
| Iran | Iranian Geothermal Energy Association |
2006-2008
|
10
|
| Ireland | Geothermal Association of Ireland | 2008-2010 | 33 |
| Italy | Unione Geotermica Italiana |
2006-2008
|
89
|
| Japan | Geothermal Research Society of Japan |
2008-2011
|
102
|
| Lithuania | Lithuanian Geothermal Association |
2006-2008
|
25
|
| Macedonia | Macedonian Geothermal Association |
2006-2008
|
37
|
| Mexico | Mexican Geothermal Association |
2008-2012
|
48
|
| Netherlands | Dutch Stichting Platform Geothermie | 2007-2009 | 47 |
| New Zealand | New Zealand Geothermal Association | 2006-2008 | 212 |
| Philippines | National Geothermal Association of the Philippines | 2006-2008 | 230 |
| Poland | Polish Geothermal Association |
2006-2008
|
48
|
| Poland | Polish Geothermal Society |
2009-2011
|
67
|
| Romania | Romanian Geothermal Association |
2008-2010
|
29
|
| Russia | Russian Geothermal Association |
2006-2008
|
50
|
| Slovakia | Slovakian Geothermal Association |
2008-2010
|
30
|
| Switzerland | Swiss Geothermal Society |
2007-2009
|
81
|
| Turkey | Turkish Geothermal Association |
2008-2010
|
86
|
| USA | Geothermal Resources Council |
2008-2010
|
824
|
| Category | |||
|
Corporate
|
22 | ||
| Individual | 83 | ||
| Institute | 4 | ||
| Student | 15 | ||
|
Sustaining
|
2 | ||
| Total | 3476 | ||