1991 European Energy Charter

• signed on 17 December 1991

1994 Energy Charter Treaty

• signed on 17 December 1994 
• ratified on 15 December 1997
• deposited on 12 February 1998
• entered into force on 13 May 1998

1994 Protocol on Energy Efficiency and Related Environmental Aspects

• signed on 2 June 1996
• ratified on 15 December 1997
• deposited on 12 February 1998
• entered into force on 13 May 1998

1998 Amendment to the Trade related provisions of the Energy Charter Treaty

• ratified on 21 July 2006
• deposited on 9 September 2006
• entered into force on 21 January 2010

2015 International Energy Charter

• signed on 20 May 2015