One bill, which strengthens the role of the national water authority, was passed by the full senate and will go on to the chamber of deputies.
A consortium of local firms is the top ranked bidder.
The country's first medium-term power auction for three-year supply contracts will be the fourth since the 2014 energy reform.
The declaration comes despite the Brazilian government's plans to offer 30-year operating licenses for four hydropower plants at an auction next month.
The power failure was caused by heavy rain in the center-south regions of the country. At one point 300,000 families were without electricity.
Enarsa seeks bids for the conversion of thermal plants to combined-cycle; 774MW from 2016 thermal tender now online; San Juan courts renewable energy firms.