OGX Maranhão – a special purpose entity jointly owned by MPX (33.3% ) and  OGX (66.7% ) – has a majority interest in the concession of eight exploration blocks in the Parnaíba Basin (MA). Seven blocks were acquired from Petra Energia S.A. that still owns 30% equity.  
 
The eighth block, PN-T-102, was purchased by  OGX Maranhão from  Imetame Energia S.A., DELP Engenharia Mecânica Ltda. and  Orteng Equipamentos e Sistemas Ltda. that have kept  16.67%, 16.665% and 16.665% interests, respectively. OGX Maranhão owns 50% of the block and is the operator.

The Parnaíba Basin is located in the Northeast of Brazil and extends over an area of approximately 680,000 km², across the states of  Maranhão, Piauí, Tocantins and small areas of the states of  Pará, Ceará and Bahia. On the North, the Parnaíba Basin abuts on the São Luís and Barreirinhas Basins, on the Northeast on the  Marajó Basin and on the South on the  São Francisco Basin. The maximum thickness of Basin sedimentary layer is estimated to reach approximately 3,500 meters.

Based on the results disclosed on the Potential Resources Report prepared by petroleum consultants DeGolyer & MacNaughton’s, with  December  2010 as the base date, the net potential resources of the OGX Maranhão blocks are estimated to add up, on average, to  1.0 billion boe, out of which  79 million are contingent resources, and  920 million net risked prospective resources, considering an average  probability of  success of 19.7%.
 The exploration campaign in this basin was started by OGX in September 2009.  Currently the company has two drilling rigs working in parallel and a the start up of a third one is scheduled for the month of  October. OGX is planning to have  15 wells drilled in the region by 2013. A major exploration budget of R$ 700 million was set for the exploration campaign.

In May  2011,  OGX declared the commerciality of the accumulations Califórnia and Fazenda São José that will be company first natural gas fields, named  Gavião Azul and Gavião Real, respectively. Production is planned to start in the second semester of  2012 and should reach  5.7 million m³/day of natural gas.

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The Parnaíba Thermoelectric Complex relies on 3,722 MW installed capacity from gas generation, power to supply the consumption of a city with 6.3 million inhabitants, such as Rio de Janeiro​