Petrobras plans to participate in Brazil's three upcoming oil and gas bid rounds in 2013 while seeking partners for future concessions. The state-controlled company is optimistic about exploration opportunities in northeast Brazil and believes there could be major discoveries in the Equatorial and East Margins. While required to operate all new subsalt concessions with at least 30% ownership, Petrobras indicated it can meet up to 70% of investment costs through partners. The company is also developing scenarios to work with partners and evaluating Brazil's unconventional reserves ahead of future auctions.