Smart charging, peak-rate bill? Check one session properly

A scheduled charging slot and the final amount billed are two records to reconcile. Before assuming an error, establish which Intelligent Octopus Go arrangement your account uses, then compare one disputed period with the actual charging and billing data.

Checked 17 October 2026. This is a bill-checking workflow, not a live tariff quote or a promise of a refund. It concerns UK Intelligent Octopus Go, not ordinary Octopus Go, Electroverse public charging or Intelligent Drive Pack.

First check which rules apply to your account

Octopus's current Charge Cap explanation describes a rollout: household off-peak remains 23:30–05:30, while eligible smart EV charging has a six-hour allowance measured midday to midday. EV use beyond the allowance, or Boost charging, can be at the standard rate even overnight. Eligible extra smart charging can also discount household use in that half-hour.

The supplier says account enablement is shown in the app. Check your notification and contract rather than applying an old forum answer—or this rollout—to every account. Save the dated terms applicable to the bill you are checking.

Work through one disputed charge

1. Choose one session. Note its date, start/end times, charger/car integration and whether you selected smart charging or an immediate Boost/Max operation.
2. Keep the schedule and actual delivery separate. Save the supplier's scheduled periods and the charger/car's actual charging history. A planned period alone does not prove energy was delivered throughout it.
3. Check the allowance period. Include earlier charging since midday, not merely since midnight. Time plugged in is not necessarily time charging.
4. Read the billed breakdown. Under the updated arrangement Octopus provides separate home/EV consumption in the online account, with data arriving about a day later. Use that record, not an in-home display's running estimate.
5. Align the clocks and units. Check date, local time versus any UTC export, half-hour boundaries, kWh and whether prices include VAT. Keep originals unchanged and work on a copy.
6. List the exact difference. Identify the billed EV energy, rate used and rate you believe applies under your account's terms. Do not multiply the entire household's energy by the EV-only difference.

Make the discrepancy small enough to investigate

Use one row per disputed period: date/time; actual charging evidence; supplier's home/EV kWh; rate billed; expected rate; reason. For an invented example, 3 kWh charged at 30p instead of an applicable 8p would differ by 66p: 3 × (30−8) ÷ 100. That example does not establish which rate your session qualifies for.

A car's battery gain is not a replacement for metered import. Conversion losses, other household loads and solar/battery flows can make those quantities differ. Start with the supplier's billed split and ask how a disputed classification was calculated.

If you use Ohme

Ohme's official instructions distinguish smart charging from Max charging and describe checking that the charger is online. Check its instructions for your integration before changing schedules. Do not stack independent car and charger timers while trying to reproduce a single controlled session.

Octopus's updated explanation also describes Ohme's Prioritise Savings versus Prioritise Target options. Where your account and app offer them, read the choice before selecting it: meeting a target and avoiding extra peak-rate charging are different priorities.

Ask for a specific correction

Use the supplier's authenticated support route. You can write:

Please review the attached period on my Intelligent Octopus Go bill. My account uses [version/notification date]. The schedule showed [times], actual charging was [times], and the billed breakdown records [EV kWh and rate]. I believe [rate] applies because [term and allowance evidence]. Please explain the classification and allowance calculation, and correct/rebill this period if it was rated incorrectly.

Send only the relevant bill and session evidence privately. Redact identifiers before sharing publicly. Keep the reference, reply and revised bill; check that any correction actually covers the disputed dates. Do not change tariff or disable smart control simply to hide an unexplained billing problem.

Why this answer exists

Owner reports of apparently misrated EV energy prompted the question. They establish a reason to check, not proof that every similar bill is wrong. The supplier's current terms and your own account evidence decide the calculation.

For comparing tariffs before switching, use EVDeal's whole-bill Cost Desk. Its two-rate comparison does not model every dynamic home/EV billing split.