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PARTLY

As of 13 August 2026, AI can only partly calculate your energy direct debit.

This still needs a person who signs their name to it.

Can you do it?

15 minutesto a draft.

30 minutesto something you’d act on.

Cost, all in£0

Skill neededchat-fluent

Who has to check ityou

What the alternative costsNo priced energy-bill calculation service is included in the supplied data.

If this goes wrong, you can pay too much for a period or build up a balance that your supplier later collects.

What to actually do

  1. Hand it to a person

    The route this page recommends

    A person who owns the outcome does this end to end, worth it when the failure is dear.

  2. Use a tool built for this

    Second choice

  3. Do it yourself

    The distant third

    A chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.

    How to actually do it

    1. Open your latest energy bill and supplier account, then copy the tariff name, unit rate, standing charge, billing period, current direct debit and account balance.
    2. Gather your latest meter readings and the dates they were taken, plus any annual usage figure shown on a recent bill or annual statement.
    3. Record household changes that could alter usage, such as moving home, adding an appliance or changing heating habits.
    4. Paste the gathered information into the prompt, replacing every bracketed slot and leaving a slot marked as unknown if the bill does not provide it.
    5. Compare the model's annual cost and account-balance adjustment with the figures on your bill, checking each multiplication and division using a calculator.
    6. Contact your supplier through the details on the bill, give them the estimate and ask whether the proposed direct debit matches their current forecast and account balance before changing the payment.

    Prompt

    Calculate an estimated energy direct debit for my UK household using only the information below. Do not invent a tariff, usage figure, balance, billing period or supplier rule. If anything essential is missing, say exactly what is missing before calculating. Show the calculation clearly and separately state: the annual usage estimate, the expected annual cost, the effect of my current account balance, and the suggested monthly payment. Treat the result as an estimate rather than a guarantee, explain how seasonal usage could change it, and give a low, central and high scenario only when the supplied figures support those scenarios. Check the arithmetic twice. Do not tell me to change my direct debit without first telling me what I should confirm with my supplier.

Supplier: [supplier name]
Tariff name: [tariff name]
Tariff type: [fixed or variable]
Unit rate or rates: [paste the current bill or tariff details]
Standing charge: [paste the current bill or tariff details]
Annual usage or recent meter readings: [paste figures and dates]
Billing period covered: [period]
Current account balance or debt: [amount]
Current direct debit: [amount]
Household changes expected: [none or details]
Any supplier payment review information: [paste it here]

    Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

What it gets wrong

  • AI cannot see your supplier's live account, current forecast or internal direct-debit calculation unless you provide the relevant information.
  • AI cannot know whether your recent usage is representative of the next billing period, particularly when heating demand changes.
  • AI cannot confirm that a copied tariff rate applies to every meter register, time band or charge on your account.
  • AI cannot change the supplier's direct debit or correct an account balance caused by a faulty meter reading.
  • AI cannot guarantee that a payment will prevent a future debt or leave your account at the balance you expect.

What caps this at PARTLY: real time truth, verification cost and stakes of error.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

AxisScore (0–2)
Output2
Inputs1
Verification1
Liability1
Effort delta2
Total7 / 10

The methodology and its thresholds are published in full.

FAQ

Can ChatGPT work out my energy direct debit?
Yes, it can calculate an estimate from your usage, tariff, account balance and billing period. It cannot see your supplier's live forecast or guarantee that the result is the payment your supplier will set.
How do I calculate what my monthly energy payment should be?
Start with your expected annual energy cost, adjust it for any account credit or debt, and divide the resulting amount across the payment period used by your supplier. Check the result against your latest bill and ask the supplier to confirm its forecast before changing the direct debit.
Should I reduce my energy direct debit if I am in credit?
Not automatically. Credit can reflect seasonal usage or a temporary change, so compare it with your expected future usage and ask your supplier how its payment review treats the balance.
Can AI use my meter readings to set my direct debit?
AI can use the readings to estimate usage and calculate a suggested payment if you provide accurate dates and tariff details. Only your supplier can apply the reading to the account and set or confirm the direct debit.

Nearby answers

All Energy & bills rulings

Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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