ICAP encompasses ETS from various government levels: regional, national and sub-national (states, provinces, cities).

Launched on October 29, 2007 in Lisbon, Portugal, by leaders of more than 15 governments, the partnership now counts 31 full members and 4 observers.

As of July 2015

 

Europe
EU ETS
Denmark
European Commission
France
Germany
Greece
Ireland
Italy
Netherlands
Portugal
Spain
United Kingdom
Norway
Swiss ETS
Switzerland
North America
Regional Greenhouse Gas Initiative Members (RGGI)
Maine
Maryland
Massachusetts
New York
Vermont
Western Climate Initiative Members (WCI)
British Columbia
California
Manitoba
Ontario
Québec
Arizona
New Jersey
New Mexico
Oregon
Washington
Asia Pacific
Australia
New Zealand
Tokyo Metropolitan Government
Observers
Japan
Kazakhstan
Republic of Korea
Ukraine