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Braga will officially replace Edison Lobão on Thursday as part of a 13-member cabinet reshuffle announced by President Dilma Rousseff.
"Petrobras will undergo major changes that will strengthen its administrative capacity and promote meritocracy," Braga said in an interview published by the Globo newspaper.
"Political influence in itself is not harmful but it is increasingly clear that we need more open dialogue to give the market confidence. The same goes for Eletrobras."
Lobão last week admitted distributors would be forced to pass on higher costs to consumers.
According to Braga, Brazil must lessen its reliance on hydropower, which comprises more than 60% of the country's installed capacity.
"Our system is very robust and reliable, but of course it's not perfect," Braga said. "Hydropower has a significant share of the energy matrix and, in cases of severe droughts, that becomes a problem.