How much do solar panels save per month?

£12–£76 per month depending on the season. Summer months (May–July): £65–£76/month. Winter months (November–January): £12–£21/month. Annual average: £48–£68/month for a 4kW system without battery.

Do solar panels really reduce electricity bills?

Yes — by 50–85% for most UK homes. A 4kW system reduces grid import from ~3,700 kWh to ~1,700 kWh (without battery) or ~600 kWh (with battery). The remaining grid import is mainly winter evenings.

How much do solar panels save with a battery?

A battery adds £150–£400/year in extra savings by storing daytime solar for evening use. Without battery: £580/year (4kW). With battery: £820/year (4kW). The battery captures surplus that would otherwise export at 4.5p/kWh and uses it at 26.11p/kWh value.

Will solar panels eliminate my electricity bill?

Not completely — you still pay for grid electricity used at night and in winter, plus the daily standing charge (~£365/year). But total costs drop from ~£1,300/year to ~£400–£700 (without battery) or ~£150–£500 (with battery).

Solar Panel Electricity Savings: Real Numbers

By Home Solar Guide Team|Updated 18 March 2026|money

Independently written | Evidence-based | Sources cited

Real UK solar electricity savings shown on an electricity bill — These are real, verified savings — not projections. Solar delivers from day one.

What would this actually cost at your home?

Installed prices vary widely by roof, access and region. Get an installed price for your property from MCS-certified installers.

Get an Installed Price

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How much do solar panels save on electricity?

UK solar panels save £580–£1,100 per year on electricity depending on system size, self-consumption rate, and whether you have a battery. A 4kW system saves £580/year without battery (50% self-consumption) or £820/year with a 10kWh battery (80% self-consumption). These savings include both: reduced grid imports (worth 26.11p/kWh) and Smart Export Guarantee income (4–15p/kWh for surplus). All figures are based on Ofgem price cap July-September 2026 rates.

Savings by System Size and Setup

Annual electricity savings (Ofgem price cap July-September 2026: 26.11p/kWh, SEG: 4.5p/kWh):

System	Battery?	Self-Consumption	Bill Saving	SEG Income	Total
3kW	No	50%	£368	£68	£436
3kW	5kWh	75%	£551	£34	£585
4kW	No	50%	£490	£90	£580
4kW	10kWh	80%	£784	£36	£820
5kW	No	50%	£613	£113	£726
5kW	10kWh	80%	£980	£45	£1,025
6kW	No	50%	£735	£135	£870
6kW	13kWh	80%	£1,176	£54	£1,230

With Octopus Flux tariff optimisation (battery owners): - Peak export at 15–24p/kWh during 16:00–19:00: adds £100–£300/year - Overnight cheap charging at 7.5p/kWh: additional arbitrage savings - 4kW + battery + Flux: £1,020–£1,120/year total - 6kW + battery + Flux: £1,430–£1,530/year total

Source: Ofgem price cap July-September 2026; Octopus Flux tariff rates; PVGIS UK yields.

Before and after electricity bill showing real solar savings — Real savings: from £108/month down to £40-60/month after solar installation.

What Drives Your Actual Savings?

The biggest factors determining YOUR specific savings:

Self-consumption rate — THE most important factor. Using solar directly saves 26.11p/kWh. Exporting earns only 4.5p/kWh. Every kWh shifted from export to self-use adds 20p of value.
Your consumption pattern — home during the day? Higher self-consumption = higher savings. At work all day? Lower self-consumption (battery helps).
System size vs consumption — a 4kW system matching your 3,700 kWh consumption is better than a 6kW system on a 2,500 kWh household (more surplus exported at low value).
Battery — increases self-consumption from ~50% to ~80%, adding £150–£400/year in extra value.
Smart tariff — Octopus Flux/Go adds £100–£300/year through tariff arbitrage (with battery).
Roof direction — south = 100% output. East/west = 80-85%. This directly scales your savings proportionally.
Location — south of England generates ~15% more than northern Scotland. Savings scale accordingly.
Electricity price — the higher the grid rate, the more each self-consumed kWh is worth. If prices rise, your savings automatically increase.

What would this actually cost at your home?

Installed prices vary widely by roof, access and region. Get an installed price for your property from MCS-certified installers.

Get an Installed Price

Roof direction directly affects savings — south is best but all viable — Roof direction scales your savings proportionally — south is best but east/west still delivers well.

Monthly Savings Breakdown

4kW system, no battery, south-facing (monthly):

Month	Generation	Self-Consumed	Bill Saving	SEG Income	Total
January	100 kWh	50 kWh	£12	£2	£14
February	150 kWh	75 kWh	£18	£3	£21
March	300 kWh	150 kWh	£37	£7	£44
April	420 kWh	210 kWh	£51	£9	£60
May	500 kWh	250 kWh	£61	£11	£72
June	520 kWh	260 kWh	£64	£12	£76
July	500 kWh	250 kWh	£61	£11	£72
August	450 kWh	225 kWh	£55	£10	£65
September	350 kWh	175 kWh	£43	£8	£51
October	220 kWh	110 kWh	£27	£5	£32
November	120 kWh	60 kWh	£15	£3	£18
December	80 kWh	40 kWh	£10	£2	£12
Annual	3,710 kWh	1,855 kWh	£454	£83	£537

~70% of savings come from April–September. Winter savings are modest but still contribute.

With a battery: winter evening savings improve significantly (battery covers 4–6 hours of evening use from stored daytime solar).

Source: PVGIS monthly UK generation; Ofgem price cap July-September 2026.

Monthly solar generation showing seasonal savings pattern — Peak savings: May–July. Even winter months contribute £12–£21 per month.

How to Maximise Your Electricity Savings

Run appliances 10am–3pm — dishwasher, washing machine, tumble dryer during peak solar. Use delay timers.
Add a battery — increases self-consumption from 50% to 80%, adding £150–£400/year.
Use a time-of-use tariff — Octopus Flux/Go adds £100–£300/year through smart import/export.
Install a solar diverter — routes surplus to hot water (£100–£250/year additional saving).
Monitor your system — catch faults early. Every month of undetected underperformance costs £40–£70.
Keep panels clean — 2–5% output recovery = £12–£50/year.
Choose the best SEG tariff — rates range 4–15p/kWh. Switching from 4p to 12p earns £160/year extra on 2,000 kWh exports.

Monitoring app showing real-time savings and self-consumption data — A monitoring app helps you shift usage to sunny hours — maximising every kWh of free solar.

Frequently Asked Questions

Related: Home Heating Systems

Solar panels are most powerful when combined with an efficient heating system. Heat pumps use solar-generated electricity to heat your home at 300-400% efficiency — making them the ideal partner for solar.

heat pump running costs in the UK

Heat pumps use electricity at 300-400% efficiency, making them ideal partners for solar.

From our sister site Home Heat Pump Guide