I read a short story in a hard back anthology. This was a couple years ago in a college library, and I'm pretty sure the book had been re-bound; so the story could be old, like 80's but I don't know for sure.
This is "Darkness" ("Escuridão" in Portuguese) by the Brazilian writer André Carneiro. I have it in Nova 2, a 1972 hardcover anthology edited by Harry Harrison; another possibility is Best SF: 1972 by Harry Harrison and Brian W. Aldiss.
In the story, the earth starts to go dark slowly and goes totally dark
Waldas accepted the reality of the phenomenon a little later than the others. Only on the second day, when everybody was commenting on the growing darkness and the dimming of the lights did he admit it was true. An old lady was shouting that the world was coming to an end. People gathered in little groups, most of them offering metaphysical explanations, mixed with the scientific commentaries from the papers.
for three days.
It was longer than that:
During the early hours of the eighteenth day they were awakened by shouts of joy and animation. One of the refugees who hadn't been able to go to sleep had felt a difference in the atmosphere. He climbed the ladder outside the house.
There was a pale red ball on the horizon.
The main character avoids the anarchy that ensues
Armed with a crowbar from his toolbox, he was leaving his shelter to steal food. It was frightening to think what he might encounter. The darkness had erased all distinctions.
when he meets a pack of blind people who have learned to live in darkness.
The blind men finished distributing the full sacks, suitcases, and boxes for the trip. Waldas, standing still and useless, thought about how many times he had passed these men with their dark glasses, their white canes, their heads fixed, always facing forward. True, he always gave them a brief thought of pity. Ah, if he had only known then how one day they would become the magic protectors, capable of saving other beings, beings made of flesh, muscles, thoughts, and with useless eyes, the same as theirs.
I think the author was Brazilian, but I'm not 100% sure.
He is Brazilian all right. You can read his biography in The Encyclopedia of Science Fiction or (in Portuguese) Wikipedia.