Most of what is written about auditing utility bills is written by firms that audit utility bills for a contingency fee, which shapes what gets emphasized. The reality is less dramatic and more useful: the common finding is not an error at all. It is a correct charge, correctly calculated, under a tariff that stopped matching the site some years ago.
This is a repeatable review that finds both. It needs one recent bill, twelve months of history, the filed tariff for your rate schedule, and about an hour.
Before you start
Get three documents. The bill is the easy one.
The filed rate schedule comes from the state utility commission or the utility's own tariff library, and you want the version in force for the period you are auditing, not the current one if they differ. The interval data comes from the utility and is covered in how to get your interval data — several steps below cannot be completed without it.
The twelve points
- 1. Account and meter identity. Confirm the meter number on the bill is the meter serving the space you are paying for. Multi-tenant and multi-building sites do get crossed, and the error survives indefinitely because both bills look reasonable.
- 2. Meter multiplier. Confirm the multiplier equals CT ratio × PT ratio × register constant, and that register readings times multiplier equals billed kWh. A wrong multiplier scales every determinant identically and is invisible in the bill's internal consistency. See meter multipliers and CT ratios.
- 3. Rate schedule eligibility. Read the eligibility clause of your schedule. Confirm you still qualify, and check whether you now qualify for another. Demand thresholds, voltage level and load factor are the usual criteria, and sites cross them without noticing.
- 4. Demand interval. Confirm the tariff's interval length and confirm your data was collected at the same interval. Confirm whether demand is measured across the whole month or only inside a defined window.
- 5. Billed demand versus measured demand. Compare the demand billed against the highest interval in your data. If billed is higher, find which clause did it: a ratchet, a contract minimum or a power factor adjustment. See ratchet clauses.
- 6. Ratchet arithmetic. If a ratchet applies, recompute it: the percentage, the look-back period, and which historical month is setting the floor. Check the floor is actually still within the look-back window and has not been carried past its expiry.
- 7. Power factor treatment. Determine whether the tariff penalizes power factor, bills kVA, or ignores it. If it does either of the first two, calculate what full correction would be worth.
- 8. Rider inventory. List every rider with its unit. Add the demand-based ones to the base demand rate; add the energy-based ones to the base energy rate. Confirm each rider actually applies to your customer class. See riders and surcharges.
- 9. Seasonal and time-of-use boundaries. Confirm bills spanning a season change are split correctly, and that time-of-use periods are applied per the tariff's own definitions rather than per the calendar.
- 10. Estimated reads. Identify any period billed on an estimate rather than a read, and confirm the subsequent true-up was calculated correctly, including any ratchet floor set by an estimated figure. See estimated reads, true-ups and rebills.
- 11. Taxes and exemptions. Confirm the tax treatment matches your status. Manufacturing and process-use exemptions exist in a number of states and are applied on the basis of a certificate the utility holds, which can be missing or out of date.
- 12. Twelve-month trend. Chart billed demand, energy and load factor by month. Look for a step change that has no operational explanation. A step is what a tariff change, a meter change or a mis-set multiplier looks like from the outside.
What each finding is worth
The twelve points do not have equal value, and it is worth knowing which ones justify the hour.
| Finding | Frequency | Typical value | Recovers retrospectively? |
|---|---|---|---|
| Wrong rate schedule for the load shape | Common | High | No — forward only |
| Uncorrected power factor exposure | Common | Moderate to high | No — forward only |
| Demand-based riders excluded from savings models | Very common | Changes project decisions | Not a refund |
| Ratchet floor carried past its window | Occasional | Moderate | Sometimes |
| Wrong meter multiplier | Rare | Very high | Usually, within commission limits |
| Missing tax exemption | Occasional | Moderate | Sometimes |
| Arithmetic error in the bill itself | Rare | Varies | Usually |
Note the pattern. The frequent findings are forward-looking and the retrospective ones are rare. A review sold on the promise of recovering money is being sold on its least likely outcome.
Turning findings into action
Findings divide into three types, and each has a different route.
Errors — a wrong multiplier, a rider that does not apply, a missing exemption — go to the utility in writing, with the arithmetic attached and the tariff clause cited. A letter enclosing a reconciliation gets a materially different response from one enclosing a complaint. If it stalls, the state commission has a formal complaint process.
Mismatches — the wrong schedule for your load — go through the tariff switching process, which has its own notice periods, minimum stay and eligibility rules. Model it against your interval data before committing: how to choose a rate schedule.
Opportunities — power factor exposure, a peak worth shaving — become projects, and a project needs a business case rather than a finding. An audit that ends with a list of possibilities and no numbers attached to them tends to end there permanently.
The one habit worth keeping
Do point twelve every month. Charting billed demand, energy and load factor takes two minutes once the spreadsheet exists, and it turns the annual audit into a confirmation rather than a discovery.
A step change in any of the three, with no operational explanation, is the earliest signal that something has moved. Catching it in month one rather than month twenty is the difference between a conversation and a claim.
