I
t is known that the Energy Charter Treaty (ECT) was adopted and opened for 
signature together with the Protocol on Energy 
Efficiency and Related Environmental Aspects 
(PEEREA) in Lisbon in December 1994 in order 
to ensure the implementation of the European 
Energy Charter adopted in December. In 1991, 
in The Hague, he announced the development of 
cooperation in the energy sector between East 
and West. PEEREA entered into force in April 
1998 after ratification by the first thirty states.