Fixed vs SVT Under the May 2026 Price Cap (UK)
Should you fix your energy tariff in May 2026 or stay on the standard variable tariff at the Ofgem cap? Here's the trade-off explained for typical UK households, with worked numbers and the scenarios where each makes sense.
- Why SVT in May 2026 effectively means "the cap"
- When fixed beats SVT — and the (rare) cases when it doesn't
- Three-question checklist for your specific home
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What "SVT" means in May 2026 specifically
Standard variable tariff (SVT) is the default tariff your supplier puts you on when you have no active contract. In May 2026:
- SVT rates are capped at the Q2 2026 Ofgem level — £1,641/year for typical dual-fuel direct-debit.
- SVT rates can change up to four times per year, in line with quarterly Ofgem announcements (next one: 27 May for July rates).
- You can leave SVT any time with no exit fees.
So "stay on SVT" in May = pay the cap, with rates that may change on 1 July.
What "fixed" gives you instead
A fixed tariff locks your unit rates and standing charges for a set period (commonly 12, 18 or 24 months). In May 2026:
- Most fixed deals are priced 3–7% below the cap for typical usage.
- You're protected from any cap rise on 1 July or beyond.
- You may have exit fees if you leave early (commonly £25–£75 per fuel).
Trade-off: lock-in flexibility for guaranteed rates and modest immediate savings.
Worked numbers: typical UK household
Assumptions: typical Ofgem TDCV (2,700 kWh elec / 11,500 kWh gas), direct debit, 12 months May 2026 – April 2027.
| Scenario | SVT 12-month cost | Fix 12-month cost | Difference |
|---|---|---|---|
| Caps stay flat (Q3, Q4, Q1) | £1,641 | £1,560 | Fix saves £81 |
| Caps rise 5% over year | ~£1,705 | £1,560 | Fix saves £145 |
| Caps fall 5% over year | ~£1,580 | £1,560 | Fix saves £20 |
| Caps fall 10% over year | ~£1,520 | £1,560 | Fix loses £40 |
Fix wins in three of four scenarios. The only loss case requires a sustained ~10%+ cap fall — possible but not predicted by current forecasts.
When SVT is actually the better choice
Three scenarios where SVT beats fix:
- You expect to move soon (within 6 months). Most fixes have exit fees that can outweigh the saving over a short window.
- You think wholesale will fall sharply. SVT tracks the cap quarterly and falls quickly. A fix locks you out.
- You're already on a sub-cap fix that's expiring. SVT for a few weeks while you compare carefully is fine.
For most other households in May 2026, fix beats SVT.
Three-question checklist
- Will I be at this property for at least 6 months? If no, SVT or no-exit-fee fix.
- Do I want to think about energy again before April 2027? If no, fix is for you. If you enjoy comparing quarterly, SVT works.
- Is my usage above 2,000 kWh elec or 8,000 kWh gas? If yes, fix savings are larger in absolute £.
Two or more "fix-leaning" answers → fix.
Frequently Asked Questions
Is fixed cheaper than SVT in May 2026?
Yes for most households. Fixed deals price 3–7% below the cap for typical usage. Annual saving £60–£150 depending on usage.
What's the risk of fixing in May 2026?
If the cap falls sharply over the next 12 months (>5–8%), a fix could end up more expensive than SVT. Current forecasts don't predict this, but it's possible.
Can I leave a fixed tariff early?
Yes, but typically with exit fees of £25–£75 per fuel. Some no-exit-fee fixes exist at slightly higher prices.
Does SVT change every quarter?
Yes — SVT rates track the Ofgem cap, which is reviewed every 3 months. Next review: 27 May 2026 for rates from 1 July.
Should I fix for 12 or 24 months?
12 months is the safer default in May 2026 due to uncertainty around the Q3 cap. 24-month fixes work if you want longer-term certainty and can accept slightly higher pricing.
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Information is for general guidance based on Ofgem published cap data and supplier pricing as of early May 2026. Specific rates depend on your postcode, meter type and tariff terms. Always check the latest tariff details before switching. EnergyPlus is an independent comparison service.
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