Regulated x deregulated
Power contracting in Brazil can be regulated or deregulated
It is the National System Operator that dispatches electricity to meet the demand of all connected customers in the country.
Electrons do not "know" whether the client is regulated or deregulated! They follow the electric load!
The difference between the two environments is essentially the costs that each one pays. What's Included and what's not!
The cost incurred for the generation, transmission and distribution of electricity to the customer is the same in both environments. The selling price though, changes because the pricing criteria are different.
These considerations are made because over time there is a tendency for a massive migration to the deregulated market. And then, all costs should be passed on to them. Even those that regulated pay and those that currently deregulated do not pay.