Utility bill auditing is a real discipline with a real return, and also a category with a lot of noise in it. The difference usually comes down to how the firm is paid and what that does to the scope of work.

What a bill audit actually looks for

Not the rate. The rate is a procurement question. An audit looks at whether the invoice correctly applies the tariff you are on, and whether you are on the right tariff at all.

• Tariff misclassification. A site on a general service rate that qualifies for an industrial or time-of-use rate. The most common finding, and it recurs monthly until corrected.
• Meter and multiplier errors. A transformer loss adjustment or CT ratio applied incorrectly, quietly inflating every bill by a fixed percentage.
• Demand ratchet misapplication. A ratchet billed beyond its contractual window.
• Tax exemptions not applied. Manufacturing and certain nonprofit uses are exempt from sales tax on energy in many states. The exemption has to be claimed, and frequently was not.
• Phantom and closed accounts. Meters still billing after a site closed or a tenant left.
• Duplicate charges and estimated reads that were never trued up.

The contingency question

Most bill audits are sold on contingency, typically a share of recovered refunds and sometimes a share of forward savings. There is nothing wrong with that model. It aligns the firm with finding something and removes the upfront cost objection.

What it does do is shape scope. A contingency auditor is economically motivated toward findings that are large, recent, and easy to document. Errors that are small per month but have run for years, or that require a tariff argument with the utility, are less attractive to work even though they may be worth more over time.

That is worth knowing rather than worth avoiding. The right response is to ask how far back they review and whether forward corrections are in scope, not to reject the model.

Questions that separate the real ones

• How many months of history do you review, and is that limited by the utility refund window or by your own scope?
• Do you review tariff eligibility, or only whether the current tariff was applied correctly? These are different exercises.
• Who files the claim with the utility, and who handles the dispute if it is denied?
• Are forward-looking corrections included, or only historical refunds? A tariff switch that saves money every month from now on is worth more than a one-time credit.
• What happens to findings that are real but not recoverable? A good auditor still reports them.
• Are you also selling supply? If so, how is that conflict handled?

The conflict worth naming

Some firms audit bills and also broker supply. That can work well, because the same interval data serves both, and it can also mean the audit becomes a lead generator for the supply sale, with scope shaped accordingly.

We do both, so this is worth stating plainly: they should be separately scoped and separately reported, and you should be able to take the audit findings and do nothing about supply. If a firm cannot describe how it separates the two, that is the answer.

What good looks like

A finished audit should hand you a line-by-line list of what was found, what it is worth, whether it is recoverable or forward-looking only, and what the utility said. Anything reading as a summary without the underlying invoices behind it is a sales document, not an audit.