Commercial utility bills are complex documents with dozens of individual charges, each calculated according to specific tariff rules. This complexity creates opportunities for errors that can cost businesses thousands of dollars. Here are the ten most common billing errors professional auditors find.
1. Wrong Rate Schedule
The most expensive error. A business placed on the wrong rate classification overpays on every charge on every bill. This happens when accounts are set up incorrectly, when a business changes operations but does not update its rate, or when the utility fails to reclassify an account after a rate restructuring. Typical overcharge: 10% to 30% of the total bill, every month.
2. Demand Ratchet Miscalculation
Most commercial electric tariffs include a demand ratchet clause that sets a minimum billing demand based on the highest measured demand in the prior 11 months (typically 70% to 80% of the peak). When the utility miscalculates the ratchet — using the wrong percentage, the wrong lookback period, or failing to reset after the peak expires — the customer pays inflated demand charges for months. Typical overcharge: $200 to $2,000 per month.
3. Meter Multiplier Error
Commercial meters use current transformers (CTs) with a multiplier that converts the raw meter reading to actual consumption. Common multipliers are 20, 40, 80, 120, and 200. If the utility records the wrong multiplier, every kWh reading is wrong by the same factor. A 40x multiplier recorded as 80x doubles every charge on every bill. This is rare but catastrophic when it occurs.
4. Estimated Read Not Trued Up
When a meter cannot be read, the utility estimates the bill based on historical usage. The next actual read should produce a true-up adjustment. But sometimes the true-up never happens — leaving a permanent overcharge (or undercharge) on the account. Always check bills marked "Estimated" to verify that the following month includes a correction.
5. Power Factor Penalty on Compliant Account
Power factor penalties apply when a customer's power factor drops below the tariff threshold (typically 0.85 or 0.90). Common errors include applying the penalty when the power factor is actually above the threshold, using the wrong penalty formula, or calculating reactive demand incorrectly. Typical overcharge: $300 to $1,500 per month.
6. Sales Tax on Exempt Charges
Not all utility charges are taxable. Many states exempt certain surcharges, environmental riders, or renewable energy charges from sales tax. If the utility applies tax to the full bill including exempt items, the customer overpays on taxes every month. Additionally, some businesses (manufacturers, farmers, nonprofits) qualify for tax exemptions they are not receiving.
7. Expired Rider Still Billing
Utilities implement temporary surcharges — storm recovery, infrastructure improvement, rate case expense — that are supposed to expire after a set period or when costs are recovered. Sometimes these riders continue billing after their expiration date due to billing system errors. If you see a surcharge you do not recognize, verify its authorization and expiration.
8. Stale Fuel Cost Adjustment Rate
Fuel cost adjustment (FCA) rates change monthly. When the billing system carries forward a stale rate from a prior month, every kWh is charged at the wrong fuel adjustment rate. On a 50,000 kWh account, even a $0.005/kWh discrepancy produces a $250 error in a single month.
9. Duplicate Charges
Franchise fees charged twice, surcharges applied under two different names, or line items that appear on both page 1 and page 2 of a multi-page bill. Duplicates are surprisingly common and easy to miss because they may use slightly different labels for the same charge.
10. Wrong Customer Charge
The fixed monthly customer charge should match the tariff exactly. When a customer is reclassified to a different rate schedule, the customer charge sometimes does not update to match the new rate. This is a small but persistent error — $50 to $200 per month, every month, indefinitely.
How to check your bills: Start with the total — does last month's bill look significantly different from the same month last year? Then check demand — is billing demand higher than actual demand? Finally, verify the rate schedule matches your business type. These three checks catch the majority of errors.
Learn to Find Every Error
The AAUBA CUBA certification teaches professional error detection methodology across electric, gas, water, and telecom bills.
Get CUBA Certified — $229