EDF Sunday Saver free electricity Sundays explained
A practical UK guide to how “free electricity Sundays” style offers usually work, who they suit, and what to check before you change tariff. We can’t show live EDF terms here—use a whole-of-market quote for what’s available at your postcode today.
- Understand eligibility (meter type, smart usage data, payment method)
- Spot common exclusions (cap, window hours, higher base rates)
- See realistic examples with numbers and a decision checklist
Info is guidance only. Offers and terms change and may differ by region, meter type and payment method. Always check the tariff facts before switching.
Fast answer: “EDF Sunday Saver free electricity Sundays explained”
The key fact: “Free electricity Sundays” offers typically make your electricity unit rate £0 during a defined Sunday time window, but you still pay your standing charge and you may pay a higher rate at other times. Whether it’s good value depends on how much usage you can genuinely shift into the window and what the non-Sunday rates are.
Best for
Households that can move high electricity use (washing, tumble drying, dishwasher, batch cooking, EV charging) into Sunday daytime and have a compatible meter/data setup.
Watch outs
The “free” period may be capped, limited to certain hours, or require opt-in. If your weekday unit rate is higher, you could lose money if you don’t shift enough usage.
Quick check
Look at your last 30–90 days usage (kWh). Estimate what % you can move to Sunday. Then compare the whole tariff (standing charge + all other unit rates), not the headline perk.
Important: We don’t publish EDF’s live terms or rates here, and we won’t guess them. Offers change and can be withdrawn. Use a comparison quote for your postcode to see what’s actually available and to read the tariff details before you switch.
How “Sunday Saver” style deals usually work (plain English)
In the UK, “free electricity” promotions are normally a time-limited price change applied to electricity usage recorded in half-hourly (or smart-meter) data. In practice, it tends to work like a time-of-use perk added to an electricity tariff.
- A defined Sunday window applies (for example, a set number of hours on Sunday). Your electricity unit rate may drop to £0 during that window.
- Outside the window, you pay the tariff’s normal rates (and the standing charge still applies every day).
- Measurement relies on meter data. Many such offers need smart meter readings (often half-hourly data) so the supplier can tell what you used during the “free” hours.
- You may need to opt in or meet conditions (for example, an app setting, marketing permissions, or a minimum time on supply). Always check the tariff information and offer terms.
What “free electricity” usually does not mean
- It doesn’t remove your electricity standing charge.
- It doesn’t automatically make the overall tariff cheapest.
- It doesn’t apply to gas usage.
- It doesn’t mean your bill is £0—only the unit charges within the qualifying window may be £0.
Ready to check live availability?
Because eligibility and pricing can vary by postcode, meter and payment method, the quickest way to see if a “free Sundays” style option stacks up is to compare all available tariffs for your home.
Tip: have a recent bill or app screenshot handy so you can compare standing charge, unit rates and any exit fees.
Safety first: Don’t run appliances unattended. Avoid using multiple high-load devices on one extension lead. If you have a prepayment meter, check how credit is applied and when.
Eligibility: what to check before you switch
Meter type & data
- Do you have a smart meter (electricity at minimum)?
- Is half-hourly or detailed smart data enabled/available?
- If you’re on Economy 7 or another legacy setup, confirm compatibility and how rates would change.
Payment method & account setup
- Direct Debit vs receipt of bill vs prepayment: availability can differ.
- Check any requirements to use an app or online account.
- If you’re in debt repayment, confirm how switching affects it.
Your household routine
These deals only pay off if you can reliably move consumption into Sunday. Be honest about:
- How often you’ll run laundry/dishwasher on Sunday
- Whether you can batch cook and reheat later
- EV charging or other big loads you can schedule
Contract terms
- Is it a fixed tariff? If yes, check for exit fees.
- How long does the promotion last?
- Is the “free” usage capped or subject to fair-use rules?
Check your options (whole of market) — without guesswork
Tell us where you live and how to reach you, and we’ll help you compare what’s available for your home today. We’ll focus on the total cost (standing charge + unit rates + any fixed-term conditions), not just the headline perk.
Good to know: You don’t need to know your current unit rates to start. A postcode and contact details are enough to pull relevant options and guide what to check on your bill.
Get a tailored comparison
Two realistic scenarios (with numbers you can sanity-check)
These examples use simple maths to show how the saving can appear. They are not EDF rates and not a promise of savings. Replace the “paid unit rate” in the calculations with the rate shown on the tariff facts for any offer you’re considering.
Scenario A: small flat, weekend catch-up
- Assumptions
- You can move 8 kWh of weekly usage to the “free Sunday” window (2 laundry cycles + dishwasher + batch cooking). Your paid unit rate outside the window is 25p/kWh (example only).
- Estimated value of the perk
- 8 kWh/week × £0.25 = £2.00/week (about £8.70/month).
- What could cancel it out
- If the rest-of-week unit rate is, say, 2–3p/kWh higher than an alternative tariff, and you use ~200 kWh/month outside Sunday, that uplift could be £4–£6/month—cutting the benefit.
Scenario B: family home, heavy appliance day
- Assumptions
- You can move 20 kWh/week to Sunday (multiple laundry loads, tumble drying, dishwasher, meal prep). Paid unit rate outside the window is 28p/kWh (example only).
- Estimated value of the perk
- 20 kWh/week × £0.28 = £5.60/week (about £24/month).
- What to check
- If the offer has a cap (e.g. max “free” kWh), you may not get full value. And if your standing charge or weekday rates are higher, your net saving could be lower.
Rule of thumb: The perk value is roughly (kWh you can shift into Sunday) × (your paid unit rate). Then compare that against any increases in standing charge, weekday unit rates, or loss of other discounts.
Compare: “free Sundays” vs other common UK electricity options
Use this table to decide what to check when you’re comparing tariffs. We’re describing structures, not specific supplier products—availability changes and may depend on your meter and region.
| Tariff/offer type | What you gain | What to check | Who it suits |
|---|---|---|---|
| “Free electricity Sundays” promo | £0 unit rate in a defined Sunday window (usually electricity only) | Window hours, caps/fair use, opt-in rules, weekday unit rate, standing charge, fixed-term exit fees | People who can shift high loads to Sunday reliably |
| Standard single-rate | Same unit rate all day | Standing charge, fixed vs variable, any exit fee, payment method discounts | Most households who can’t shift usage easily |
| Time-of-use (multiple rates) | Cheaper energy at certain times (often overnight or defined periods) | Exact rate windows, peak prices, smart meter requirements, your ability to automate | EV owners, people who can schedule loads |
| Economy 7 / legacy off-peak | Cheaper off-peak rate for a set block of hours | Off-peak hours vary by region/meter; daytime rate can be higher; heating/hot water controls | Homes with storage heating or significant night use |
Decision checklist: likely a good fit
- You can move at least 10–20% of weekly electricity into Sunday (estimate from your routine)
- You have (or will get) a smart meter and the offer can measure usage by time
- You’ve checked the non-Sunday unit rate and standing charge are still competitive
- You’re comfortable with any app/opt-in steps required
Decision checklist: likely not worth it
- Your Sundays are usually out of the house (little shiftable usage)
- You’re already on a good-value tariff and the weekday rate would rise
- You rely on medical/essential equipment and can’t move consumption safely
- You’d face exit fees on your current fix that outweigh the perk
Costs, exclusions & common pitfalls (UK-specific)
“Free Sundays” is a headline feature. Your bill is still driven by the full tariff structure. Here are the checks that most often make or break the value for UK households.
1) Standing charge still applies
Even if the unit rate is £0 for a period, the standing charge is typically billed daily. Compare standing charges as well as unit rates.
2) Caps and “fair use”
Some offers limit the amount of energy eligible for £0 pricing or apply conditions. If you plan big loads (e.g. EV charging), check if the perk is capped.
3) “Free” window hours
If the window is shorter than your Sunday routine, you may still pay for some of the energy you assumed would be free. Confirm the exact hours and timezone (UK time, DST changes).
4) Higher rates elsewhere
The supplier may recover the perk cost with a higher weekday unit rate or standing charge. Always compare total estimated annual cost on like-for-like usage.
5) Smart meter and data permissions
Time-based billing features often need smart meter data. If your meter is in “dumb” mode or data sharing is limited, the offer may not work as expected.
6) Switching timing & exit fees
If you’re on a fixed tariff, an exit fee could outweigh any benefit. Also check when the promo begins (e.g. from supply start vs from opt-in date).
If you’re in a vulnerable situation: Citizens Advice explains extra help available and how to deal with billing issues. See: Citizens Advice energy guidance.
FAQs
Is EDF Sunday Saver really free electricity on Sundays?
“Free” usually means the electricity unit rate can be £0 during a defined Sunday time window, based on your meter data. You normally still pay the standing charge and you may pay normal (or higher) rates outside the window. Always confirm the exact terms on the tariff and offer details before switching.
Do I need a smart meter for a “free Sundays” offer?
Often, yes. Time-window pricing typically relies on smart meter readings (sometimes half-hourly) so the supplier can identify usage during the qualifying hours. If you don’t have a smart meter, the offer may be unavailable or may not apply as expected—check the eligibility criteria.
Do I still pay a standing charge on Sundays?
In most UK domestic electricity tariffs, the standing charge applies every day, including Sundays. A “free electricity” promotion generally affects unit charges for a time period, not the standing charge. The standing charge is one reason these deals don’t suit everyone.
Can I use the free period for EV charging or running a tumble dryer?
Potentially, but it depends on the offer’s terms (for example, whether there’s a cap or fair-use limit) and on electrical safety. If you plan high loads, check the qualifying window hours and any limits first, and avoid unsafe setups like overloaded extension leads or unattended drying.
What happens if I’m on a fixed tariff and I switch?
You may have to pay an exit fee if you leave a fixed tariff early—this is set out in your tariff terms. Before switching for a Sunday-style perk, compare the exit fee against the estimated value of the “free” hours and check any notice periods.
Is “free Sundays” better than the Ofgem price cap?
The Ofgem price cap limits the maximum prices suppliers can charge on standard variable tariffs in Great Britain, but it doesn’t mean every capped tariff is good for you. A Sunday promotion could be better or worse overall depending on standing charge, non-Sunday rates and your usage pattern. Compare total estimated cost for your postcode and meter.
Will the free period definitely be applied to my bill?
Not always. Some offers require opt-in, specific meter data settings, or a start date before benefits apply. Billing can also lag while readings are processed. If you join an offer, keep an eye on your first statements and contact your supplier promptly if the discount doesn’t appear.
What’s the simplest way to check if it’s worth it for my home?
Estimate how many kWh you can move into Sunday (from your routine or smart meter app), multiply by the paid unit rate you’d otherwise pay, then compare that value against any increase in standing charge and weekday unit rates. For real figures, run a whole-of-market comparison for your postcode.
Trust, methodology & sources
Page ownership
- Written by:
- EnergyPlus Editorial Team
- Reviewed by:
- Energy Specialist
- Last updated:
- July 2026
How we assess “free electricity” style offers
We evaluate these promotions as a bill impact question, not a marketing claim. Our approach:
- Identify the window: the hours/days where the unit rate changes and whether opt-in is required.
- Estimate shiftable usage: based on typical appliance kWh ranges and realistic household routines (we avoid best-case assumptions).
- Compare the whole tariff: standing charge + all non-window unit rates + any fixed-term conditions/exit fees.
- Check measurement requirements: smart meter, data granularity, and whether billing relies on half-hourly data.
Limitations: We do not have access to your household’s exact half-hourly profile, and we don’t publish supplier-specific live rates or terms on this page. Always use your tariff information and a postcode-based comparison for current availability.
Want to know if “free Sundays” is actually good value for you?
Compare the whole-of-market options for your postcode, then judge the perk against the standing charge, weekday rates and any exit fees. It’s the simplest way to avoid switching for a headline that doesn’t fit your routine.
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