Brazil's network looks like it's mostly a single interconnected system except for very remote areas. It also looks like there's 4 subregions of the grid - North, Northeast, South, and Southeast. Within each of those there will be no differentiation between sources, just the same average fuel mix. Between them there may or may not be differences in the fuel mix depending on transmission lines.
However given there's hydro everywhere you're likely to be getting around the average national grid mix of about 80%+ hydro and the rest gas/nuclear/imports.
