Energy tariffs with free electricity evenings (UK guide)

A practical, UK-focused guide to “free evening electricity” tariffs: how they work, who they suit, what’s usually excluded, and how to compare them safely without overpaying at other times.

  • Understand the difference between truly free kWh vs bill credits and “time-of-use” discounts
  • See two realistic household scenarios with estimated numbers (and the assumptions behind them)
  • Compare key features, eligibility, and common pitfalls before you switch
Get your energy quote How free evening tariffs work

Important: “free electricity evenings” offers vary by supplier, meter type and region. Always check unit rates, standing charges and the exact free-hours window before switching.

Fast answer: are free electricity evening tariffs worth it in the UK?

Sometimes—but only if you can reliably shift a meaningful chunk of your electricity use into the free-hours window without increasing your total usage and the tariff’s daytime unit rate and standing charge don’t wipe out the benefit.

What “free evenings” usually means

A set time window (often 2–5 hours) where the electricity unit rate is reduced, sometimes to £0/kWh. Some deals use bill credits instead of truly free kWh.

Who they tend to suit

Homes with a smart meter and flexible routines: EV charging, tumble dryer, dishwasher, laundry, batch cooking, immersion heater (if suitable and safe), or electric heating that can be scheduled.

The biggest catch

Outside the free window, unit rates can be higher than a standard variable tariff. If you can’t shift usage, you may pay more overall.

Quick rule of thumb (estimated): If you can’t move at least 15–25% of your electricity into the free-evening window, a “free evenings” tariff often struggles to beat competitive standard tariffs once higher daytime rates/standing charges are included. This varies by region and product terms.

How “free electricity evenings” tariffs work

In the UK, these are typically a type of time-of-use (TOU) tariff. Your electricity price depends on when you use it. The “free” period is designed to reward you for moving usage to a specific window (often evenings, sometimes weekends too).

Common formats you’ll see

1) £0/kWh (or very low) in a set window
You pay a normal day rate outside the window, and sometimes a separate “peak” rate. Read the exact times and whether they vary by season/day.
2) Discounted evening rate (not free)
Cheaper evenings but still paid per kWh. Often easier to compare and sometimes less “spiky” than free-window deals.
3) “Free” as bill credit or reward
Some offers provide credits based on meeting conditions. Treat this as a discount and check the rules (caps, qualifying usage, and whether credits can change).

Meter requirement: In practice, most free-evening/TOU tariffs require a working smart meter (SMETS1/SMETS2) that can send half-hourly readings. If you have a traditional credit meter, you’ll likely need an upgrade.

What to check before you switch

  • Exact times for the free window (start/end) and whether it changes on weekends or bank holidays.
  • Unit rates outside the free window (single rate vs peak/off-peak), and whether prices can change.
  • Standing charge (daily fee) for your region.
  • Payment method (Direct Debit, prepayment, etc.) and whether the tariff is available on it.
  • Contract length and any exit fees.
  • Eligibility: smart meter, EV ownership (sometimes required), and whether you can opt out of half-hourly settlement (some tariffs need it).

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Two realistic scenarios (estimated numbers)

Scenario A: flat, no EV, can shift some usage

Assumptions (illustrative): 2-person flat, 2,400 kWh/year electricity. Free evenings window of 3 hours daily. Household can move 20% of annual kWh into the window (dishwasher, laundry, cooking schedule). No change in total kWh used.

Estimated effect: 20% of 2,400 = 480 kWh potentially free.

If the alternative tariff would charge an estimated 24p/kWh, the “free window” value is about £115/year (480 × £0.24).

But if the free-evening tariff’s non-free unit rates/standing charge cost an extra £80–£140/year versus a good standard tariff in your region, the net benefit could be small or negative.

Scenario B: household with an EV and smart charging

Assumptions (illustrative): 3–4 person home, 3,600 kWh/year household electricity plus 1,800 kWh/year for EV charging at home. Free evenings window of 4 hours. Able to place 70% of EV charging into the free window via scheduling (no extra miles driven).

Estimated effect: 70% of 1,800 = 1,260 kWh potentially free.

At an estimated alternative rate of 24p/kWh, that’s around £302/year value (1,260 × £0.24).

If higher peak/day rates add £120–£220/year elsewhere, you may still come out ahead—but only if the EV actually charges in the free window and the tariff doesn’t penalise other high-usage times.

These scenarios are illustrative, not a quote. Rates vary by region, payment method and product. Use them to sanity-check whether a tariff is likely to fit your routine.

Compare: free evenings vs other UK tariff types

Use this table to decide what to shortlist. In most cases, the “best” option depends on when you use power (not just how much).

Tariff type Best for Watch-outs Typical requirements
Free electricity evenings (TOU) People who can reliably shift usage to the free window (EV, appliances, flexible routines) Higher rates outside the window; strict time band; may not suit families with peak cooking/heating use outside window Often smart meter + half-hourly reads; usually Direct Debit
Off-peak night tariffs (e.g., Economy 7 style) Homes using storage heating or big overnight loads Day rate can be high; time bands vary by region/meter; not always compatible with all meters Two-rate meter; sometimes smart meter helpful
Standard variable (single rate) Simplicity and flexibility; people who don’t want time bands Prices can change; may not be cheapest for high off-peak users Any meter type; widely available
Fixed tariff (single rate or TOU) Budget certainty for a set term Exit fees may apply; if market prices drop you may be locked in Depends on product; credit check sometimes for monthly DD

Decision checklist: it may suit you if…

  • You have (or can get) a smart meter and are happy with half-hourly readings.
  • You can shift regular loads (EV charging, laundry, dishwasher) into the free window.
  • You’ve checked that the standing charge and non-free unit rates are competitive for your region.
  • You’re comfortable with the free window times (e.g., not conflicting with bedtime/noise constraints).

It’s often a poor fit if…

  • Your usage is mostly daytime (home working with electric heating/cooking).
  • You can’t control timings (shared laundry facilities, unpredictable schedules).
  • You’re on prepayment and the product isn’t available (many aren’t).
  • You’re already on a good TOU/off-peak deal and the “free” window is offset by higher peak pricing.

Costs, exclusions and common pitfalls (UK-specific)

“Free” is rarely the whole story. Here are the issues we see most often when households compare free-evening tariffs.

1) Higher rates outside the window

Some tariffs offset “free” hours with higher day/peak unit rates. Always compare the weighted average cost based on your real usage pattern.

2) Standing charges vary by region

Your daily standing charge can differ depending on where you live. A small difference (e.g., 5–15p/day) can matter over a year.

3) Smart meter and readings

TOU billing typically needs half-hourly data. If your smart meter is not communicating, you may be billed incorrectly or moved to another tariff until it’s resolved.

4) Not all usage is easy to shift

Kettle, showers (electric), cooking and heating can be hard to move. Don’t plan savings based on loads you can’t realistically schedule.

5) Exit fees and term length

Fixed TOU deals can have exit fees. If you think you may move home soon (tenants), check portability and fees first.

6) “Free” may be capped or conditional

Some offers limit the free kWh, restrict which days qualify, or pay credits that can change. Check the tariff info and T&Cs.

Safety and comfort note: Only schedule appliances when it’s safe to do so. Follow manufacturer guidance for tumble dryers, dishwashers and washers; keep ventilation clear; avoid running high-heat appliances unattended if you’re not comfortable doing so.

A simple way to sanity-check the maths

Before switching, estimate:

  • Free kWh value = (kWh you can move into free window) × (your best alternative unit rate)
  • Extra cost elsewhere = (higher non-free unit rate × your non-free kWh) + (higher standing charge × 365)

If your “extra cost elsewhere” is bigger than the free kWh value, the deal is unlikely to be good for your household.

FAQs: free electricity evening tariffs in the UK

Are free electricity evening tariffs genuinely free?

Sometimes the unit rate for that window is £0/kWh, but you still pay a standing charge and you may pay higher rates at other times. Other products use credits or rewards rather than £0/kWh. Always read the tariff information label and T&Cs.

Do I need a smart meter?

In most cases, yes. Time-of-use pricing typically requires half-hourly readings from a smart meter so the supplier can bill you correctly for the free window and any peak/off-peak rates.

Are these tariffs available everywhere in Great Britain?

Availability can vary by supplier and by region. Standing charges and unit rates also vary by region. If you live in a complex metering setup (for example, certain legacy Economy 10 arrangements), options may be more limited.

Can I get free evenings on a prepayment meter?

Often not, but it depends on the supplier and whether you have a smart prepayment meter. Many TOU products are designed for monthly Direct Debit. If you’re on prepayment, it’s especially important to confirm eligibility before switching.

If I already have Economy 7, is a free-evening tariff better?

Not automatically. Economy 7 focuses on overnight off-peak; free-evening tariffs focus on an evening window. If your heavy use is overnight (storage heating, hot water, EV charging overnight), Economy 7 or other off-peak products may still suit you better.

Can the supplier change the free hours or prices?

It depends on whether the tariff is fixed or variable and what the contract says. Even on fixed deals, suppliers may update product terms at renewal. Check your tariff documents for notice periods and what can change during the term.

Will switching affect my Warm Home Discount or Priority Services Register support?

Warm Home Discount rules and eligibility can vary by scheme year, and not all suppliers participate in the same way. Priority Services Register support should be available across suppliers, but you may need to re-register after switching. If you rely on these, check before you move.

What if I rent—can I still switch to a free evenings tariff?

Usually yes if you pay the energy bills and you’re not on an all-inclusive rent arrangement. If you need a smart meter installation, you may want to inform your landlord/agent (metering changes can require access and sometimes permission).

Trust, methodology and sources

Page ownership

How we assess “free evenings” tariffs (our approach)

We evaluate these tariffs primarily on total expected annual cost for different usage patterns, not the headline “free” claim. When we write about them, we look at:

  • Time windows (length, consistency across weekdays/weekends, and clarity in the tariff documents)
  • Rate structure (single rate vs multiple bands; whether peak rates are materially higher)
  • Standing charge by region and payment method
  • Eligibility (smart meter requirements, EV requirements, Direct Debit constraints)
  • Contract terms (fixed vs variable, exit fees, and renewal behaviour)
  • Practicality (how easy it is for a typical household to shift usage without inconvenience or risk)

Assumptions and limitations (read this)

  • The scenarios on this page use illustrative unit rates to show how the maths works. They are not predictions and not personalised quotes.
  • Actual savings depend on your half-hourly usage shape, appliance efficiency, home size, and behaviour.
  • Prices, windows and eligibility can change; always confirm using the supplier’s tariff documents before you switch.
  • EnergyPlus is a comparison service; we aim for accuracy and clarity, but we can’t guarantee availability of any specific tariff in all areas at all times.

Useful UK sources

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Updated on 10 Apr 2026