This underpins sector expectations of a near-quadrupling of the existing 3.5GW of online wind capacity by 2018.
Wind makes up 88% of the 7GW of total power offers in the June A3 auction. EPE president Maurício Tolmasquim explained the domination by pointing to wind's "highly competitive" costs in Brazil.
Small hydro, biomass and large hydro extension make up the remainder.
The auction is for new power due to go online at the beginning of 2017. Most offers come from the states of Bahia in the west, Ceara in central Brazil and Rio Grande do Sul in the south.
While the final amount to be sold is not yet known, the country's wind sector association, Abeeolica, says it expects more than 3GW of wind to be contracted in June's A3 and September's A5 auctions, combined.
At the same time, a report from Brazil's National Development Bank (BNDES) predicted that wind would receive around 22% of the BRL 200 billion ($89 billion) total estimated investments in new power nationwide over the next three years.