The "official" answer is to ensure that the electricity sector operates in a balanced and competitive manner for all members of the value chain.
This is far from what happens in Brazil. We are among the most expensive considering our competitors - the BRICS countries.
In other words, regulation is a mountain of paperwork that does not fulfill its main function, which is to make productive activity - especially the industrial one - viable in a competitive manner.
Regulation as it stands points to a significant cost without delivering the associated value. And the result is the loss of Brazil's industrial GDP. What saves Brazil is agriculture!