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Arizona regulators launch inquiry into utility’s rates

Arizona regulators have launched an inquiry into the rates and profits of the state's largest electric utility following a rate challenge and customer complaints.

The Arizona Republic reports the Arizona Corporation Commission voted unanimously Tuesday to file a new case on Arizona Public Service Co. rates.

The commission approved a rate hike for the utility in 2017, with officials saying the increase averaged about 4.5%, or $6 a month for residential customers.

Customers have disputed those figures, saying their bills increased more.

Rate cases typically take about a year to resolve and proceed like court trials.

The rate cases include expert testimony and a review of the utility's spending.

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