Cheapest fixed energy tariff UK (June 2026): how to find it

Cheapest ≠ lowest unit rate.
Standing charge can outweigh a slightly lower unit rate, especially for low-use homes.

Check exit fees.
Some fixed deals charge per fuel if you switch away before the end date.

Prepayment and Economy 7 differ.
Make sure you’re comparing the right meter type and day/night split.

Price cap context.
Ofgem’s cap affects default tariffs, not necessarily fixed deals—fixed can be above or below it.

Compare fixed tariffs for your postcode (whole-of-market)

Use this quick form to receive an estimated comparison based on your details. We’ll use your postcode to pull regional rates and show you the fixed deals that match your meter and payment method.

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A fixed tariff can suit you if…

• You value predictable unit rates for budgeting.
• You expect to stay put for the full fix term.
• You’ve checked exit fees and they’re acceptable.
• You’re comfortable with online billing (common on cheaper deals).

A fixed tariff may not suit you if…

• You might move home or change tenancy soon.
• You’re actively watching the market and want to switch again quickly.
• You’re on an Economy 7 setup but can’t shift usage to off-peak.
• You need support features (e.g., Priority Services Register) and haven’t checked the supplier’s approach.

1) Exit fees and moving home

Many fixed tariffs include exit fees (often per fuel). Some suppliers waive fees if you’re moving, but rules vary. Always read the tariff’s “leaving charges” and “moving home” terms.

2) Standing charges can dominate

If your usage is low, a deal with a slightly higher unit rate but lower standing charge can be cheaper overall. Always compare estimated annual cost, not just p/kWh.

3) Economy 7 & off-peak assumptions

Economy 7 savings depend on how much electricity you actually use at night. If most of your usage is daytime, a single-rate fixed tariff can be better even if the night rate looks attractive.

4) Direct debit vs prepayment

Cheapest fixed tariffs are often direct-debit only. Prepayment tariffs can price differently and may have different standing charges. Make sure you filter correctly.

5) “Tracker” and “variable” aren’t fixed

A tracker follows a published index or wholesale-linked formula. A standard variable tariff can change (within rules). If you want price certainty, confirm the word Fixed and check the end date.

6) Add-ons and bundles

Some tariffs include perks (rewards, smart services). Useful for some, irrelevant for others. Don’t pay extra unless you’d genuinely use the add-on.

Scenario A: Low-use flat (single-rate, direct debit)

Annual electricity use

1,800 kWh

Annual gas use

6,000 kWh

Assumed term

12-month fix

Deal 1 (looks cheaper on unit rate): Elec 26p/kWh + 60p/day, Gas 6.5p/kWh + 35p/day

Estimated cost: Elec (1,800×£0.26)=£468; standing (365×£0.60)=£219; total elec £687. Gas (6,000×£0.065)=£390; standing (365×£0.35)=£128; total gas £518. Combined ≈ £1,205/year.

Deal 2 (slightly higher unit rate, lower standing): Elec 27p/kWh + 45p/day, Gas 6.7p/kWh + 28p/day

Estimated cost: Elec £486 + £164 = £650. Gas £402 + £102 = £504. Combined ≈ £1,154/year. For low usage, the lower standing charge can win.

Scenario B: Higher-use family home (single-rate, direct debit)

Annual electricity use

4,200 kWh

Annual gas use

14,000 kWh

Assumed term

12-month fix

Deal 1: Elec 26p/kWh + 60p/day, Gas 6.5p/kWh + 35p/day

Estimated cost: Elec (4,200×£0.26)=£1,092; standing £219; total elec £1,311. Gas (14,000×£0.065)=£910; standing £128; total gas £1,038. Combined ≈ £2,349/year.

Deal 2: Elec 27p/kWh + 45p/day, Gas 6.7p/kWh + 28p/day

Estimated cost: Elec £1,134 + £164 = £1,298. Gas £938 + £102 = £1,040. Combined ≈ £2,338/year. Here the two are close, and small rate differences can swing the result.

1) Is the cheapest fixed tariff always below the Ofgem price cap?

Not necessarily. Ofgem’s price cap applies to default tariffs (including standard variable) for typical payment methods, not to every fixed deal. A fixed tariff can be priced above or below the cap depending on market conditions and supplier strategy.

2) Why do fixed prices differ by postcode?

Electricity networks are split into regional distribution areas with different charges. That flows into the standing charge and sometimes the unit rate. So a tariff can be “cheap” in one region and average in another.

3) Can I switch to a fixed tariff if I’m in debt to my supplier?

Sometimes, but it depends on circumstances (including whether the debt is with your current supplier and how it’s being repaid). You may need to clear the debt or agree a repayment plan first. Citizens Advice has guidance on switching when you owe money.

4) What’s the catch with “cheap” online-only fixed tariffs?

They may require direct debit, paperless billing, and account management via app/portal. That’s not a problem if you prefer online service—but check support options, complaint handling, and whether phone support is limited.

5) How do exit fees work on fixed tariffs?

Exit fees (if charged) are usually a set amount per fuel if you leave before the tariff end date. Some suppliers waive fees in a specific window near the end of the fix, but that’s not universal—always check the tariff information label or terms.

6) Do I need a smart meter to get the cheapest fixed tariff?

Not always. Some tariffs are open to any meter type; others (especially time-of-use) require a smart meter. If you have a smart meter already, you may qualify for more tariff types, but you should still compare total cost.

7) I rent—can I switch to a fixed tariff?

Usually yes if you pay the energy bills and your name is on the account. If bills are included in rent or the landlord is the account holder, you may not be able to change supplier. Always check your tenancy agreement and speak to the account holder.

8) How long does it take to switch energy supplier in Great Britain?

Switching timescales can vary, but many switches complete within a few working days under modern switching arrangements. Complex cases (meter issues, address mismatches, debt) can take longer. You’ll normally have a cooling-off period after signing up.

Our definition of “cheapest”

For this guide, “cheapest fixed tariff” means: the fixed-rate tariff with the lowest estimated total cost over a comparable period for a given household, using:

• Unit rates (p/kWh) plus standing charges (p/day)
• The household’s estimated consumption (kWh) for electricity and (if applicable) gas
• The customer’s region (via postcode) and payment method

Limitations (important)

• Tariffs can change or close at short notice.
• Some deals have eligibility rules (online-only, smart meter, DD required).
• Economy 7 and time-of-use savings depend on when you use energy.
• Exit fees can alter “best value” if you plan to switch again.

We don’t claim a single supplier is always cheapest nationwide.

We don’t make guarantees about savings—quotes are estimates and depend on actual usage and tariff terms.

We don’t hide the key levers (standing charge, meter type, region) that change the result.

Written by

EnergyPlus Editorial Team

Reviewed by

Energy Specialist

Last updated

June 2026

Sources we rely on

• Ofgem (UK energy regulator) — price cap, consumer protections, switching rules
• Citizens Advice: energy advice — switching, debt, supplier problems, billing disputes
• GOV.UK — general UK consumer guidance and support schemes (where applicable)

We link to regulator and public-interest sources so you can verify rules and protections independently.