In the United States, a utilities commission, utility regulatory commission (URC), public utilities commission (PUC) or public service commission (PSC) is a governing body that regulates the rates and services of a public utility. In some cases, government bodies with the title "public service commission" may be civil service oversight bodies, rather than utilities regulators.
PSC is not the acronym for public utilities commission.
PSC is the acronym for public service commission, and PUC is the acronym for public utilities commission. It's difficult because I phrased a definitely correct statement in the negative.