As of 13 August 2026, AI can only partly compare energy tariffs for you.
This still needs a person who signs their name to it.
Can you do it?
5 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 costsThe supplied data contains no price for a human or specialist tariff-comparison service.
If this goes wrong: you choose a tariff that looks cheaper but has a different usage basis, eligibility rule or charge, and pay more than expected.
What to actually do
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.
Use a tool built for this
Second choiceDo it yourself
The distant thirdA chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.
How to actually do it
- Open your latest UK energy bill and record your electricity and gas usage for the period shown, including the units and dates.
- Copy the current tariff name, unit rates, standing charges, payment method, contract dates, discounts and exit fees from the bill or supplier account.
- Open the current offer pages for the tariffs you are considering and paste their full rates, terms and eligibility conditions into the prompt.
- Paste the prompt into a chatbot, replacing each bracketed slot with your usage and adding the tariff information underneath.
- Check the chatbot's extracted figures against the bill and each supplier's current offer page, correcting any rate, unit, date or condition it copied incorrectly.
- Ask the chatbot to recalculate after every correction, then compare the final result with the supplier's own quote before switching.
Prompt
Compare the UK energy tariffs in the information below. Use only the figures and terms I provide, and do not invent current rates, discounts, eligibility, exit fees or savings. First extract each tariff into a table with supplier, tariff name, tariff type, unit rate, standing charge, payment method, contract length, exit fee, discounts, eligibility conditions and any missing information. Then calculate the estimated annual cost for each tariff using my electricity usage of [electricity usage and period] and gas usage of [gas usage and period]. State the calculation assumptions and keep electricity and gas separate where the data requires it. Rank the tariffs by estimated cost, but flag any result that is not directly comparable or depends on an unconfirmed condition. Tell me exactly which figures and terms I must check on the supplier's current offer before switching. Do not recommend a tariff if a key figure is missing.
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
What it gets wrong
- It cannot know which tariffs are currently available to you without current supplier data and any required account or postcode information.
- It cannot reliably resolve different usage periods, meter types, payment methods or regional conditions when the source information is incomplete.
- It cannot confirm that a promotional rate, eligibility condition or exit fee will apply to your account.
- It does not carry the financial consequences of choosing the wrong tariff, so you must confirm the final offer with the supplier.
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.
| Axis | Score (0–2) |
|---|---|
| Output | 1 |
| Inputs | 1 |
| Verification | 1 |
| Liability | 1 |
| Effort delta | 1 |
| Total | 5 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can ChatGPT compare energy tariffs?
- Partly. It can extract rates from information you provide, calculate estimated costs and show differences, but it cannot guarantee that the figures or offers are current. Check the final rates, terms and eligibility with the supplier before switching.
- What do I need to give AI to compare energy tariffs?
- Give it your electricity and gas usage with the units and dates, plus each tariff's unit rates, standing charges, payment method, contract terms, discounts and exit fees. A recent bill and the suppliers' current offer details are better than a summary copied from memory.
- Can AI find the cheapest energy tariff for me?
- Not reliably on its own. It can rank the offers you provide, but it may miss tariffs, use stale information or overlook eligibility conditions unless you supply and check current offers.
- Is it safe to use AI to choose an energy tariff?
- It is suitable for preparing a comparison, not for accepting the result without checks. This is not professional advice, and for a serious billing dispute or contract problem you should contact your supplier first and consider a qualified energy adviser.
Nearby answers
- Can AI calculate how much an appliance costs to run?YES
- Can AI calculate how much my heating costs?YES
- Can AI check if I should fix my energy price?YES
- Can AI check if my home is suitable for a heat pump?PARTLY
- Can AI check if my home is suitable for solar panels?PARTLY
- Can AI check whether my energy bill is wrong?PARTLY
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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