PHOENIX (3TV/CBS 5) - The Arizona Public Service Company, also known as APS, is having to do damage control after it found out its rate compare tool was inaccurate.

In a letter to the Arizona Corporation Commission, which is the state's utility regulator, APS said it discovered the comparison tool gave customers wrong rate plan recommendations since February of this year. The company also said recommendation letters were also sent out earlier this year that had wrong information, which led to thousands of customers choosing a more expensive plan.

[WATCH: Arizona Corporation Commissioner Boyd Dunn fires off strongly worded email to APS]

APS said it's taken down the rate comparison tool and running tests on a new tool to make it offer the best plan for customers. For those customers who switched plans and didn't get the best deal, APS said they will receive a credit to their account. The company believes "few than 12,000 customers" were affected. The credit will be the difference between what they paid when they switched plans and what they would have paid if they chose the most economical plan.

APS said it hopes the new comparison tool will be available later this week.

 


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