Cheapest fixed energy tariff UK right now (how to find it)

Key takeaways

• Compare by estimated annual cost, not just the headline unit rate.
• Check the standing charge carefully—especially for low users.
• Look for exit fees (common on fixes), and note the tariff end date.
• Fix lengths matter: a 12‑month fix isn’t automatically better than a shorter one.

If you just want the quickest route

1. Enter your postcode and usage (or estimate it).
2. Filter to Fixed tariffs and your preferred term length.
3. Sort by estimated annual cost.
4. Open the tariff details and confirm: unit rate(s), standing charge, exit fees, and payment method.

Two quick scenarios (with numbers)

These examples show why “cheapest” changes by standing charge, usage, and fix terms. Figures are illustrative estimates only.

Math note: estimates use (unit rate × annual kWh) + (standing charge × 365), and add exit fees only if you leave before the end date.

Quick decision checklist: who a fixed tariff suits

• You want predictable unit rates for a set period.
• You prefer budget stability over chasing short‑term drops.
• You’re likely to stay in the property through most/all of the fix.
• You’re comfortable with the exit fees (or there are none).

Who it may not suit

• You may move soon (tenancy ending, sale planned) and exit fees would apply.
• You want maximum flexibility to switch quickly if prices fall.
• Your home has unusual metering (e.g., some Economy 7 or time‑of‑use setups) and you’re not sure your usage pattern fits.
• You’re on prepayment and the best fixed deals shown aren’t available for your meter type.

If you’re not sure: a safer approach

1. Compare shorter fixes (e.g., 6–12 months) against longer terms.
2. Prioritise low/no exit fees if you want optionality.
3. Re‑check deals before your tariff ends (set a reminder).

1) Exit fees (often per fuel)

Many fixes charge an exit fee if you leave early. With dual fuel, you can be charged twice (electricity + gas). If you’re renting or might move, weigh flexibility against the rate.

2) Standing charge differences by region

Standing charges vary across Great Britain. A tariff that looks “cheapest” in one region may not be competitive in another—even with the same supplier and name.

3) Meter type restrictions

Some fixed deals are unavailable for prepayment meters, or require a smart meter. If you’re on Economy 7 or time‑of‑use, check the rates match your day/night or peak/off‑peak usage.

4) Direct debit assumptions

A “cheap” fixed tariff may assume monthly direct debit. Paying on receipt of bill or using cash/cheque can be priced differently (often higher).

5) Introductory discounts and bonuses

Occasionally a tariff includes a credit, cashback, or a limited‑time discount. Check whether it’s applied upfront or spread across the year—and whether it’s contingent on certain behaviours (e.g., paperless bills).

6) Timing: when you can switch without fees

UK rules typically allow you to switch near the end of a fixed tariff without an exit fee. Always confirm this in your tariff terms and with your supplier before initiating a switch.

Is a fixed tariff always cheaper than a variable tariff?

No. A fixed tariff can be cheaper or more expensive than a standard variable tariff depending on current wholesale costs, supplier pricing, and your region. Fixed tariffs buy you price certainty (for the unit rate/standing charge), not a guaranteed saving.

What matters more: unit rate or standing charge?

It depends on your usage. If you use less energy, standing charge can dominate. If you use more, unit rate typically has the bigger impact. That’s why the most reliable comparison uses your annual kWh.

Do fixed tariffs have exit fees in the UK?

Often, yes—especially on longer fixes. Exit fees can be charged per fuel on dual fuel tariffs. Always check the tariff details before switching, particularly if you might move or want flexibility.

Can I switch if I rent?

Usually, yes—if you’re the bill payer. If you have a fixed term tenancy or may move soon, prioritise tariffs with low/no exit fees or shorter terms. If bills are included in rent, you generally can’t choose the supplier.

Do I need a smart meter for the cheapest fixed tariff?

Not always. Some suppliers offer exclusive deals for smart meters or online management. If you’re considering time‑of‑use pricing (e.g., off‑peak rates), a smart meter is usually required.

How long does an energy switch take in Great Britain?

Many switches complete within a few working days, but timings can vary depending on your supplier and whether there are meter or account issues to resolve. You won’t normally lose supply during a switch.

What if I don’t know my annual kWh usage?

You can still compare. Use your latest bill (it often shows annual usage), your online account, or estimate based on typical household consumption. The key is to be consistent when comparing tariffs—then refine once you have accurate kWh.

Does “dual fuel discount” still matter?

Less than it used to. Some suppliers price electricity and gas competitively without a clear “dual fuel discount”. Focus on the combined estimated annual cost and the terms you’re agreeing to.

Our “cheapest” definition

We treat “cheapest” as the lowest estimated annual cost for your postcode, meter and payment method—based on the supplier’s published unit rates and standing charges for that tariff.

Assumptions we use

• Annual cost estimate = (unit rate × annual kWh) + (standing charge × 365).
• If you don’t have kWh, estimates may use typical consumption bands or your provided bill spend.
• Exit fees are shown as a separate consideration because they only apply if you leave early.

Limitations (important)

• Tariffs can be withdrawn or repriced; availability can change daily.
• Supplier eligibility rules may apply (e.g., smart meter requirement, online management).
• Time‑of‑use tariffs depend heavily on when you use energy; simple annual estimates may not reflect your actual pattern.
• Northern Ireland has a different market structure; this page is focused on Great Britain unless stated otherwise in results.