Decree No. 9,143/2017, of August 23, made substantial changes to the rules applicable to auctions in the electricity sector. The new rules have made predictable the system for auctions for the purchase of electric energy in the regulated environment by determining the frequency with which the National Electric Energy Agency (ANEEL) should hold them.
The frequency of the auctions was linked to the type of project involved in the contract:
- Auctions for new energy (years "A-3," "A-4," "A-5," and "A-6");
- Auctions for existing energy (years "A," "A-1," "A-2," "A-3," "A-4," and "A-5");
- Auctions for alternative energy sources (years "A-1," "A-2," "A-3," "A-4," "A-5," and "A-6");
- Auctions for energy from generation projects indicated by the National Energy Policy Council (CNPE) resolution and approved by the President of Brazil (years "A-5," "A-6," or "A-7"); and
- Auctions for new energy, the call for bids for which will occur in conjunction with the transmission assets through which the energy will be delivered (years "A-5," "A-6," or "A-7").