Average Monthly Electric Bill With Solar Panels UK
What does your bill actually look like after solar? For a typical home, around £40–£55 a month (or £15–£35 with a battery) — down from ~£79. But rarely £0, and here’s the honest reason why.
The short answer
For a typical UK home, solar panels cut the average electricity bill from around £75–£100 a month to about £40–£55 (a 40–60% reduction) — or to £15–£35 with a battery (70–86%). The battery makes the difference by storing your daytime generation for evening use, so you buy far less from the grid. On a smart tariff too, a well-optimised solar-and-battery home can get its effective annual electricity cost below £200–£300.
But here’s the honest part most sales pages skip: your bill will almost never hit £0, for three reasons — the standing charge (~£20/month) never goes away while you’re grid-connected, winter generation collapses (a 4kW system makes ~600kWh in June but only ~80kWh in December), and you still import at night without a battery. So expect near-zero summer bills and higher winter ones, averaging out to the figures above. The full breakdown — by season, by household size, why it’s not £0, and how to push it lower — below.
What this guide covers
“What will my electricity bill actually look like after solar?” is one of the most common — and most sensible — questions before buying. This guide gives the honest 2026 answer, with real UK figures, no overselling, and a clear explanation of why solar cuts your bill dramatically without quite eliminating it.
Your electricity bill before & after solar
| Setup | Avg monthly bill | Reduction |
|---|---|---|
| No solar (avg UK home) | £75–£100 | — |
| 4kW solar, no battery | £40–£55 | 40–60% |
| 4kW solar + battery | £15–£35 | 70–86% |
| Solar + battery + smart tariff | <£20 (effective) | 80–90% |
The average UK electricity bill is around £79 a month in 2026 (based on ~3,400 kWh a year at the Ofgem price cap of roughly 24.5–26p/kWh, plus the standing charge). Add a 4kW solar system and that typically drops to £40–£55 a month — a saving of £300–£650 a year — as you use your own free generation instead of buying from the grid. Add a battery and it falls further to £15–£35 a month (saving £700–£950/year), because you store daytime solar for the evening rather than exporting it cheaply. On a smart tariff, a well-optimised system can push the effective cost below £20/month. Want your own estimate? Try our solar calculator.
Why your bill is (almost) never £0
The honest reason solar cuts your bill but rarely eliminates it
Plenty of sales pages imply solar means “no more electricity bills.” That’s not quite true, and it’s worth being straight about the three reasons a genuine £0 bill is uncommon:
1. The standing charge never goes away. This is a fixed daily fee (~65p/day, about £20/month or £223/year) just for being connected to the grid. It’s unaffected by solar — you pay it even if you import zero electricity — and the only way to escape it is to fully disconnect (impractical for most homes).
2. Winter generation collapses. UK solar is highly seasonal: a 4kW system might generate ~600kWh in June but only ~80kWh in December. So from November to February, most homes import the bulk of their electricity regardless — see our output-by-month guide for the full seasonal picture.
3. Night-time & dull-day use. Without a battery, anything you use after dark or on very overcast days comes from the grid, because the panels aren’t generating.
So the realistic outcome is a bill cut by roughly half (panels) or three-quarters (with a battery) — not zero. Summer bills can be near-zero; winter bills and the standing charge remain. That’s still an excellent result — it’s just an honest one.
Summer vs winter: your bill through the year
One thing to expect: your post-solar bill isn’t flat across the year — it swings hard with the seasons. In summer (roughly May–August), long bright days mean a solar home generates far more than it uses, so bills can drop close to zero (you’re often exporting surplus and earning SEG payments). In winter (November–February), generation collapses to a fraction of summer output, so without a battery your bill returns close to what it was before solar. Spring and autumn sit in between. This is why the “average monthly bill” figures are exactly that — an average of very low summer months and higher winter ones. A battery smooths this a little (storing what you do generate in winter, and enabling cheap overnight charging on a smart tariff), but it can’t overcome the fundamental lack of winter sunlight. Understanding this seasonal swing helps set realistic expectations: don’t be alarmed by a higher December bill — it’s normal, and it’s offset by the near-zero summer ones.
With a battery: the biggest bill reduction
Adding a battery is the single biggest lever on your post-solar bill. It stores your surplus daytime generation and releases it in the expensive evening peak, lifting your self-consumption from ~30% (panels alone) to over 80% — so far more of your own free electricity offsets grid imports instead of being exported cheaply. That’s what takes a typical bill from £40–£55 down to £15–£35 a month. The saving goes further on a smart tariff (cheap ~7–9p overnight rates let you charge the battery overnight and use it at peak), getting a well-optimised 5kW solar-and-battery home below £200–£300 a year effective cost. Whether the battery is worth the extra outlay for you depends on your usage and tariff — our honest are solar batteries worth it? guide walks through that decision, and what size battery covers sizing.
Post-solar bills by household size
Bigger homes use more, so their bills are higher both before and after solar — but the percentage reduction is broadly similar. As a rough guide: a smaller 2–3 bed home might pay around £330/year after solar (down from ~£660); a typical 3-bed home with a 4kW system sees the £40–£55/month (no battery) or £15–£35 (with battery) figures above; and a larger 4+ bed home or one with an EV/heat pump pays more in absolute terms but benefits from a bigger system and battery. The key variable isn’t really house size — it’s self-consumption: a home where someone’s in during the day, using appliances while the sun shines, will have a markedly lower bill than an identical home that’s empty 9–5 and uses everything in the evening (unless that second home has a battery to bridge the gap). This is why two neighbours with identical systems can have quite different bills.
How to push your bill even lower
Several proven ways to get the most off your bill: 1. Use appliances in daylight — running the dishwasher, washing machine and heavy loads while generating means you use free solar not grid power (homes that do this pay back 2–3 years faster). 2. Add a battery to store surplus for the evening and lift self-consumption above 80%. 3. Get the best tariffs — a smart import tariff for cheap overnight power, plus a good SEG export tariff (up to ~15p/kWh) for your surplus. 4. Consider a low-standing-charge tariff if you import very little, since the standing charge becomes proportionally bigger the less you use. 5. Use your monitoring app to learn your patterns and adjust. Together these can move you from a 40–60% bill cut (panels alone) to 80–90% (panels + battery + smart tariff) — the difference between good and excellent.
Frequently asked questions
What’s the average monthly electric bill with solar panels?
~£40–£55/month for a typical home with 4kW solar (no battery), down from £75–£100 — a 40–60% cut. With a battery, £15–£35/month (70–86%). These are annual averages: summer bills near zero, winter higher. It varies by usage, self-consumption, tariff and battery. Try our calculator for your estimate.
Do you still pay electricity bills with solar?
Yes, just much smaller ones — a £0 bill is uncommon. Three reasons: the standing charge (~£20/month) never goes away while grid-connected; winter generation collapses (~80kWh in December vs 600kWh in June); and without a battery you import at night. Solar cuts your bill by half (or three-quarters with a battery), not to zero.
Can solar reduce my bill to zero?
Not fully — the standing charge (~£223/year) is unavoidable while grid-connected, and winter generation is low. But solar + battery + smart tariff can cut the effective cost by 80–90% (below £200–£300/year), and with SEG export income some homes reach near-zero net. True off-grid needs a huge battery and isn’t cost-effective for most.
How much is the bill with solar and a battery?
£15–£35/month for a typical home — down 70–86% from £75–£100. The battery lifts self-consumption from ~30% to 80%+. On a smart tariff, a well-optimised 5kW system can get below £200–£300/year effective cost. You still pay the standing charge. See are batteries worth it?
Why is my winter solar bill so high?
Because UK solar is seasonal — a 4kW system generates ~600kWh in June but only ~80kWh in December, so you import most winter electricity from the grid. It’s normal, and it’s offset by near-zero summer bills. A battery helps a little but can’t overcome the lack of winter daylight. See our output-by-month guide.
How can I lower my bill further?
Use appliances in daylight (2–3yr faster payback), add a battery, get a smart import tariff + good SEG export tariff, consider a low-standing-charge tariff if you import little, and use your monitoring app. Together these take you from a 40–60% cut to 80–90%.
The honest bottom line
Solar panels will cut your electricity bill substantially — typically from ~£79 a month to £40–£55, or £15–£35 with a battery — and on a smart tariff a well-set-up solar-and-battery home can get its effective cost below £20 a month. That’s a genuinely big saving that keeps working for 25+ years. But be realistic about what it won’t do: because of the standing charge, winter’s low generation and night-time use, your bill won’t hit £0 — you’ll see near-zero summer bills, higher winter ones, and the year-round standing charge throughout. That’s not a catch; it’s just the honest picture, and it’s still an excellent outcome.
Your real numbers depend on your home, usage, tariff and whether you add a battery — so the best way to know your actual post-solar bill is to have it modelled. A couple of free, no-obligation quotes from MCS-certified installers will show you your genuine expected bill, savings and payback for your specific circumstances — so you can see exactly what solar would do to your monthly bill before you decide.
Important
Going Solar UK is an introduction service, not an installer. This guide gives general 2026 UK figures for research: your actual electricity bill after solar depends on your system size, household usage, self-consumption, tariff, standing charge, region and whether you have a battery, and on energy prices which change with the Ofgem price cap – the figures here are illustrative estimates, not guarantees. Always get a professional quote modelling your specific circumstances before deciding.
We may receive a commission when we introduce you to an installer, at no cost to you. Any contract for work is directly between you and the installer.