"We've been with the same municipality for 15 years. We know our bills."
"Our finance team would have noticed if something was wrong."
"We had a spike a while back and sorted it out. Everything's been fine since."
These are the three most common things we hear from South African businesses before an OptiRate audit finds a billing error. And to be clear: the businesses saying them are not being careless. They genuinely believe their accounts are in order. That belief is the problem.
What "Looking Fine" Actually Means
A utility bill looks fine when:
- The total amount is broadly consistent with previous months
- There are no obvious spikes or anomalies that would prompt a query
- The invoice arrived on schedule and the direct debit processed without rejection
None of these things tell you whether the bill is correct.
A business being charged at the wrong tariff rate will receive bills that look entirely consistent month after month. Each invoice will be internally logical. The totals will track consumption patterns. Nothing will stand out as wrong — because the error is baked into the baseline, not sitting on top of it.
A meter with an incorrect CT ratio will produce bills that look reasonable in isolation. The only way to identify the error is to compare the billed consumption against the meter's actual specifications — data that doesn't appear anywhere on the invoice itself.
An estimated reading that's been running for six months will produce plausible-looking bills right up until the correction charge arrives, at which point it looks like an anomaly rather than an accumulation.
The most expensive billing errors are the ones that look fine. They're fine until they're not — and by the time they're not, they may represent years of overpayment.
The Three Objections — and What They Miss
"We've been with the same municipality for years. We know our bills."
Longevity with a municipality actually increases certain error risks, not decreases them. Accounts that haven't been reviewed accumulate uncorrected baseline errors. Tariff categories set at account opening may no longer be appropriate for current consumption levels. CT ratios may have drifted. And when the municipality migrates to a new billing platform — which most major SA municipalities have done at least once in the past decade — errors from the old system carry forward.
Knowing what your bills have been doesn't tell you whether they've been correct.
"Our finance team would have noticed."
Finance teams are trained to manage cash flow, ensure payment, and flag obvious anomalies. They're generally not trained to read and interpret municipal tariff structures, cross-reference billed demand against meter specifications, or identify misclassified tariff categories. These are specialist skills that require both tariff knowledge and technical metering expertise — not financial management skills.
This isn't a criticism of finance teams. It's an acknowledgement that verifying utility billing accuracy requires a specific domain knowledge that most organisations don't have in-house.
"We had a spike and sorted it out."
Resolving a billing spike — especially a visible one that prompted a query — is real and valuable. But a visible spike is, by definition, the type of error that gets noticed. It's the invisible errors that don't. The tariff category that's been slightly wrong for four years. The water account with a sewerage charge calculated on the wrong ratio. The property rates that haven't been updated since the last municipal valuation roll.
Fixing one type of error doesn't mean other types aren't present.
What a Comprehensive Utility Audit Actually Checks
An OptiRate audit covers your full utility account exposure:
Electricity — tariff category verification, demand charge analysis, metering accuracy, CT ratio validation, Time-of-Use profile optimisation, estimated reading history, and retrospective overcharge recovery.
Water and sewerage — consumption verification, bulk meter accuracy, sewerage charge ratio checks, leak detection indicators, and tariff category review.
Property rates — municipal valuation accuracy, property category classification, rates calculation verification, and objection filing where the valuation is incorrect.
Metering and smart infrastructure — where smart meter data is available, interval-level analysis of demand peaks, TOU profile breakdowns, and embedded generation credit verification.
Most businesses that have "checked" their bills have checked their electricity account. Fewer have verified their water accounts. Almost none have independently confirmed their property rates valuation.
The Commercial Model Removes the Risk
OptiRate charges a percentage of confirmed savings — nothing else. If the audit finds nothing, you pay nothing. If it finds R200,000 in retrospective overcharges, OptiRate's fee is a share of that recovery.
There is no scenario in which a business that books an audit ends up worse off. The only cost of not booking an audit is the continued payment of any errors that exist — which, based on our data, is the most likely outcome for businesses that haven't been verified.
Book an Audit
If your bills look fine, that's worth verifying. If they don't, that's worth fixing. Either way, the answer is the same.