The performance of ONS in the CIER was intensified mainly from its representation in the Project CIER 15 - Study of Energy Transactions between the Andean region, Central America and South America, with ONS serving as a host for the meetings of the work group held in 2009.

ONS has participated as a speaker in international seminars sponsored by the CIER, at which seized opportunities to develop closer relations with other representatives of operators in Latin America, as well as to integrate the work being developed in the scope of the VLPGO with those of the CIER.

It is also noticeable that, during the Meeting of the Central Committee of the CIER, held in November 2009, in Madrid, ONS General Director was conducted to the post of First Vice-President of the CIER for the period November 2009 - November 2011.