"Utility redlining": systematic underinvestment in the infrastructure of neighborhoods with a large nonwhite population. The result, in the case of electricity in Detroit, is that they get frequent power outages which the same company prevents (with newer equipment) for the wealthier neighborhoods (where more whites live).

Do all electricity customers pay the same rates? If so, some other factor convinced the electric company to serve the white neighborhoods better. It would be interesting to find out how that operated.