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 24.5p/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

Last updated: 18 March 2026

Independently written

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

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 24.5p/kWh) and Smart Export Guarantee income (4–15p/kWh for surplus). All figures are based on Ofgem Q1 2026 rates.

Savings by System Size and Setup

Annual electricity savings (Ofgem Q1 2026: 24.5p/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 Q1 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 24.5p/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.

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 Q1 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.

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