Best Free Electricity Weekend Tariffs UK: May 2026

How UK free-weekend electricity tariffs work

A free-weekend tariff gives you zero-rate electricity for a defined window each weekend (commonly 9am–5pm Saturday, or all day Sunday). Outside that window, rates are typically:

• Slightly above the cap (5–10% premium) for "always on" hours.
• Sometimes a higher standing charge to fund the free window.
• Smart meter required (almost universally).

The tariff is profitable for the supplier when most customers don't fully use the free window. It's profitable for you when you can shift heavy loads (washing, dishwasher, EV charging, electric showers) into the free hours.

What's typically available in May 2026

Common formats across UK suppliers:

• Free Saturday (e.g. 9am–5pm). 8 hours/week × 52 weeks = 416 hours. At 24.67p/kWh average, every kWh shifted in saves £0.247. Maximum theoretical saving for high shifters (~5 kWh/free hour avg) is several hundred per year — but most homes shift 1–2 kWh/hour.
• Free Sunday (all day). 24 hours/week. Higher max saving but harder to make full use of without electric heating or EV.
• Free Saturday and Sunday partial windows. The most flexible — usually with a slightly higher standing charge.

Realistic annual savings for typical households who actively shift: £50–£250.

Who benefits most from free-weekend tariffs

• EV owners. Charging shifts easily. A 50 kWh weekly EV top-up entirely in free windows saves £600+/year vs cap unit rate.
• Heat pump households. Daytime heating runs can shift partly into free windows.
• Households with electric showers and large laundry/dishwasher loads. Easy to schedule.
• Home workers who can be flexible about when they cook and run electrical loads.

Who probably shouldn't bother

• Households at work all weekend. Free windows run while you're away.
• Gas-heated homes with low electrical usage. Standing charge premium can offset small savings.
• Households unable to install a smart meter. Almost always required.
• Renters in HMOs with shared meters. Hard to coordinate shifting behaviour.

Comparing free-weekend tariffs against standard fixes

For a typical 2,700 kWh elec / 11,500 kWh gas household:

• Sub-cap fix: ~£1,560/year, no behaviour change required.
• Free-weekend tariff: Could be £1,400–£1,500 if you shift well, £1,580–£1,650 if you don't shift much.

The free-weekend wins for active shifters. For passive customers, a sub-cap fix usually beats it. Be honest about your weekend behaviour before switching to a TOU tariff — most households overestimate their flexibility.

Practical setup if you're switching

1. Confirm smart meter compatibility. SMETS2 strongly preferred for time-of-use accuracy.
2. Check your distribution region. Free-weekend tariffs aren't available everywhere.
3. Plan your loads. Identify the 3–4 biggest shiftable loads (laundry, dishwasher, EV, hot water).
4. Set up smart appliances with delay-start or scheduling. Many modern washing machines and dishwashers have this built in.
5. Track for the first 4 weeks. Most customers find their actual savings differ from forecast — adjust behaviour or switch back if it's not working.

Frequently Asked Questions

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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.