Welcome insights here. I'd add that Wisconsin Energy's billing system has had known issues with backbilling limits since their platform migration. Document everything carefully.
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Anyone dealt with Southern California Edison tariff interpretation?
Need some experienced eyes on a AEP Ohio billing issue. Compared the interval data against the bill and found demand values that exceed physical capacity. I've calculated total overcharges at approximately $9,400 going back 6 years.
Don't forget to check the Rate GLP effective dates — CPS Energy backdated a rate change that caught me off guard.
Be careful with Pacific Gas & Electric's refund process — they sometimes try to limit the lookback period to 4 years.
I disagree with the approach of going straight to the PUC. Try the utility's escalation process first — it's faster.