TGS Q1 2011 webcast and teleconference

ASKER, NORWAY (28 April 2011) - TGS will publish its Q1 2011 results at approximately 08:00 CET on 5 May 2011. At the same time, a recorded presentation with audio by CEO Robert Hobbs and CFO Kristian Johansen will be made available atwww.tgsnopec.com. 

The slides from the presentation will also be available in PDF format at both the TGS and Oslo Stock Exchange websites. 

CEO Robert Hobbs and CFO Kristian Johansen will also host a conference call on 5 May 2011 at 15:00 CET Norway time (9:00 AM New York time).   Attendees may want to call 5-10 minutes before 15:00 CET (9:00 AM NY) to ensure registration and access. 

• Norwegian attendees are invited to call +800 51066 or +47 2415 9757 
• International attendees are invited to call 0800 032 3808  or +44 (0)20 7138 0844 
• US attendees are invited to call +1 866 602 0258 

Participants will need to quote the following confirmation code when dialing into the conference: 6488721.  

A Q&A session will follow a short introduction, based upon the presentation issued in the morning. To pose a question, please press *1.  

A replay of the conference call will be available shortly after. To access replay of the TGS conference call, 

• dial +47 2100 0498 (Norway) or +44 (0)20 7111 1244 (International) or +1 347 366 9565  (US) 
• replay access code 6488721 followed by # (pound-sign) 

A replay of the conference call will also be available at www.tgsnopec.com.