Energy tariffs with free evening electricity (UK guide)
Learn how “free evening electricity” tariffs work in the UK, who they suit, what to check in the small print, and how to compare them against standard and time-of-use deals.
- Clear explanation of free-evening offers (typical hours, eligibility, meter needs)
- Realistic worked examples with numbers (so you can sanity-check the deal)
- Comparison checklist + pitfalls to avoid before you switch
Important: “Free” usually means the unit rate is 0p/kWh in a set window. Standing charges and peak unit rates still apply, and hours/eligibility vary by supplier.
Fast answer: are free evening electricity tariffs worth it?
They can be worth it if you can reliably shift a meaningful chunk of your electricity use into the supplier’s “free” evening window (for example: cooking, laundry, dishwasher, EV charging, or battery charging) without paying more overall due to higher daytime unit rates or standing charges.
What “free evenings” usually means
A 0p/kWh unit rate for electricity used in a set evening window (times vary by tariff). You still pay the standing charge and you pay a (often higher) unit rate outside the free window.
Who it suits
Households that can shift 20–40%+ of electricity into the free window (typical for EV owners, homes with batteries, or flexible evening routines).
Who should be cautious
If most usage is daytime (WFH, electric heating, heat pump load, tumble dryer in the day), a higher peak rate can outweigh the “free” hours.
Compare free evening tariffs across the market
Use EnergyPlus to compare whole-of-market home energy tariffs (where available), including time-of-use options. We’ll show the key terms to check: free window hours, unit rates outside the window, standing charge, and contract conditions.
What you’ll need
- Postcode (rates vary by region)
- Payment method (Direct Debit / prepay)
- Meter type (smart, standard, Economy 7/10)
- Rough annual usage (if you have it)
What we’ll highlight
- Free-hours schedule (and days)
- Peak/off-peak unit rates
- Standing charge
- Exit fees & switching rules
Get a tailored quote
Share a few details and we’ll help you compare suitable tariffs. This is a no-obligation enquiry.
How free evening electricity tariffs work (UK)
1) You get a time window with a 0p/kWh rate
Most “free evening” offers apply a zero unit rate for electricity used during set hours (for example, a 2–4 hour window in the evening). Outside that window, the unit rate may be higher than a standard tariff.
2) Your meter must record usage in the right time blocks
Many time-of-use deals rely on a smart meter sending half-hourly (or otherwise time-sliced) consumption. If you don’t have a compatible meter, the tariff may be unavailable, or billed differently.
3) Standing charge still applies
Even when your unit rate is 0p/kWh for a few hours, you typically still pay a daily standing charge, which covers network and operational costs.
4) “Free” may be conditional
Some tariffs have eligibility rules (region, payment method, smart meter settings, or specific products like EV or battery bundles). Always check the tariff information label and T&Cs before switching.
Two realistic scenarios (with numbers)
These examples are illustrative to show the maths. Actual rates vary by region, supplier, and when you switch. Assumptions are shown so you can replace them with your own.
Scenario A: EV owner who can shift charging
- Assumptions
- Monthly electricity use: 400 kWh
- Can move into free window: 140 kWh/month (EV + dishwasher)
- Free-evening tariff peak unit rate: 30p/kWh
- Free window unit rate: 0p/kWh
- Standard tariff unit rate for comparison: 24p/kWh
- Standing charge difference ignored (assume similar)
Cost on free-evening tariff (usage only):
260 kWh × 30p = £78.00, plus 140 kWh × 0p = £0.00 ? £78.00/month
Cost on standard tariff (usage only):
400 kWh × 24p = £96.00/month
Illustrative difference: about £18/month cheaper on the free-evening tariff if you consistently shift 140 kWh into the free hours.
Scenario B: Daytime-heavy household (WFH)
- Assumptions
- Monthly electricity use: 300 kWh
- Can move into free window: 45 kWh/month
- Free-evening tariff peak unit rate: 32p/kWh
- Free window unit rate: 0p/kWh
- Standard tariff unit rate for comparison: 24p/kWh
- Standing charge difference ignored (assume similar)
Cost on free-evening tariff (usage only):
255 kWh × 32p = £81.60, plus 45 kWh × 0p = £0.00 ? £81.60/month
Cost on standard tariff (usage only):
300 kWh × 24p = £72.00/month
Illustrative difference: about £9.60/month more expensive on the free-evening tariff, because the peak rate outweighs the limited free usage.
Compare: free evenings vs other UK tariff types
Use this table to decide what you’re actually shopping for: a short 0p/kWh window, cheaper off-peak rates overnight, or simple price certainty.
| Tariff type | Best for | Main trade-off | What to check |
|---|---|---|---|
| Free evening electricity | People who can stack usage into a short evening window (EV charging, batteries, flexible routines) | Higher unit rate outside the free window can cancel out the benefit | Exact hours/days, smart meter requirement, peak unit rate, standing charge, exit fees |
| Time-of-use (multi-rate) | People who can shift to cheaper periods (often overnight) without needing “free” hours | Can be complex; peak periods may be costly | Off-peak schedule, number of rate bands, how weekends/bank holidays are treated |
| Economy 7 / Economy 10 | Homes with storage heating/hot water designed for off-peak electricity | Day rate is often higher; timing can vary by region/meter set-up | Your actual off-peak times, compatibility with your heating system, meter type |
| Standard variable / fixed | People who want simplicity and predictable billing (fixed) or flexibility (variable) | No special cheap/free hours; you pay one unit rate all day | Unit rate + standing charge, contract length, exit fees (fixed), payment method |
Decision checklist: likely a good fit if you…
- Can move regular high-kWh tasks into the free window (not just once in a while)
- Have (or can get) a compatible smart meter and you’re happy with time-based billing
- Have an EV/home battery, or you can run appliances after work
- Are willing to review bills in the first 1–2 months to confirm it’s working for you
Probably not a good fit if you…
- Use lots of electricity in the day (WFH, daytime laundry, electric cooking all afternoon)
- Have electric heating/heat pump load that can’t realistically be shifted into evenings
- Are on (or may need) a prepayment meter where choice can be more limited
- Prefer a single simple unit rate and don’t want to monitor time windows
Costs, exclusions and common pitfalls (read before switching)
1) Peak unit rates can be higher
Some “free” tariffs fund the 0p window by charging more at other times. Compare the peak unit rate against your current tariff before getting excited about the free hours.
2) Standing charge still matters
If a tariff has a higher standing charge, low-usage homes may struggle to benefit. Always compare the estimated annual cost where available.
3) “Free” may not cover every day
Some offers apply only on certain days, or they may change the schedule. Check the tariff’s day-by-day timings and whether bank holidays are treated differently.
4) Smart meter/half-hourly data consent
Time-of-use tariffs may require half-hourly readings. Ask how your data is used and what happens if your smart meter loses connection.
5) Exit fees and contract terms
Fixed time-of-use deals can include exit fees. If you’re trialling whether you can shift usage, look closely at fees and any minimum term.
6) Don’t “use more because it’s free”
The win comes from shifting existing use, not creating new use. If you add extra consumption, you can wipe out savings quickly.
FAQs: free evening electricity tariffs in the UK
Are “free evening” tariffs really free?
They’re typically “free” in the sense that the unit rate is 0p/kWh for a defined time window. You still pay the standing charge and any electricity used outside the free window at the tariff’s other rates.
Do I need a smart meter?
Often, yes. Many time-of-use and free-hour tariffs need a smart meter so usage can be allocated to the correct time bands. Availability depends on your supplier, region, and metering set-up.
What times are “free evenings” in the UK?
There’s no single standard. The free window might be 2–4 hours in the evening, and it can differ by tariff and may be subject to change. Always check the supplier’s published tariff details for the exact times and days.
Can I get free evenings with solar panels?
Potentially, but you’ll want to consider how solar generation already reduces daytime imports. Free evenings may help if you import a lot after sunset (e.g., cooking and EV charging). If you have a battery, check whether it’s better to charge in the free window or during cheaper off-peak periods, depending on the tariff structure.
Will I pay more at other times?
Possibly. Many “free” offers have higher peak unit rates (and sometimes different standing charges). The deal only works if the value of the free kWh you shift is greater than any extra cost you pay outside the window.
Are these tariffs available in my area?
Availability can vary by region (your electricity distribution area), supplier, and meter type. The simplest way to check is to compare using your postcode and current meter details.
Can I get a free-evening tariff on prepayment?
Sometimes, but choice may be more limited and depends on the supplier and meter. If you’re considering switching from prepay to credit (or smart prepay), check any eligibility steps and whether it affects your ability to access time-of-use products.
How do I compare properly (not just on the “free” headline)?
Compare: (1) peak unit rate, (2) standing charge, (3) free window hours/days, (4) any additional rate bands, (5) exit fees and term length, and (6) your realistic ability to shift kWh. If you have half-hourly data, use it.
Trust, methodology and sources
Page details
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- March 2026
How we assess “free evening electricity” tariffs
We focus on what changes your bill in practice, not just marketing labels. When we compare or explain these tariffs, we look at:
- Total cost drivers: standing charge + peak unit rate(s) + any off-peak/free window rate
- Eligibility: meter type (smart/standard), payment method, region, and any product constraints
- Usability: clarity of the free-hours schedule, whether it’s the same every day, and how changes are communicated
- Risk factors: exit fees, term length, and what happens if you can’t shift usage as planned
Limitations: tariffs, prices, and availability can change quickly and can differ by region. The scenarios on this page are illustrative and ignore standing charge differences to keep the maths clear—your real comparison should include both unit rates and standing charges.
Ready to check if free evenings will actually save you money?
We’ll compare suitable tariffs for your postcode and meter set-up, and highlight the key terms (free window hours, peak rates, standing charges, and exit fees) before you decide.
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