Rio de Janeiro, June 10th, 2013 – Petróleo Brasileiro S.A – Petrobras announces that it has executed, on May 29, 2013, a Letter of Intent with GS Energy Corporation (GSE), for the development of joint study for the Premium 2 Refinery Project, in the state of Ceará.

The Letter of Intent is based on the interest of the GSE, jointly with Petrobras, studying the feasibility of establishing a joint venture between the companies for the implementation of Premium Refinery 2.

Such Letter of Intent is not binding and does not create any obligation between the parties to enter into future trade or operational agreements after the outcome of the feasibility studies.

Sincerely,