The first time I came to Rio, about 15 years ago, favelas were horribly dangerous and completely segregated from the rest of this slice of paradise. While it's still quite dicey in some areas, the situation has noticeably changed for the better.
Rochina is one of the thriving favelas that has witnessed a marked reduction in crime and improvement in living standards, thanks in large part to government funding and a forced crackdown on drugs.
Basic necessities, like electricity, have been provided throughout the steep inclines, though the tangled mess of wires makes one wonder if it's possible for anything to function. Thankfully for the residents, the wires are live and power is humming.