How Much Can Solar Panels Save in the UK? Real 2026 Figures
Installers quote impressive savings figures — but what do UK solar panels actually save in practice? Here are real numbers broken down by system size and region, using current electricity rates and SEG income. If you're still weighing up the upfront outlay, see our companion UK solar panel cost guide.
Muhammad founded KilowattKit after spending hours trying to decode confusing electricity bills and realising there were no clear, jargon-free tools for ordinary homeowners. He researches energy rates, solar payback, EV charging, and heat pump economics across the US, UK, Canada, and Australia — sourcing every figure directly from official government and regulatory data.
☀️ Key takeaways
- ✓A 4kWp system saves £570–£670/year in the Midlands at the current 26.11p cap (bill savings + SEG income).
- ✓Scotland yields 15–20% less than Southern England — longer payback but still worthwhile.
- ✓Self-consuming solar (using it rather than exporting) is worth 26.11p/kWh vs 15p for exports.
- ✓Over 25 years, a typical UK system returns £13,000–£19,000 net of installation cost.
Annual Savings by System Size (2026 Rates)
These figures use the current Ofgem price-cap electricity rate of 26.11p/kWh (July–September 2026), a typical SEG export rate of 15p/kWh, roughly 50% self-consumption for a Midlands location, and average PVGIS yield data. Your savings rise further if energy prices increase.
| System | Annual generation | Bill saving | SEG income | Total benefit |
|---|---|---|---|---|
| 3 kWp | 2,550–3,000 kWh | £333–£392 | £96–£112 | £429–£504/yr |
| 4 kWp ✅ Most popular | 3,400–4,000 kWh | £444–£522 | £128–£150 | £571–£672/yr |
| 5 kWp | 4,250–5,000 kWh | £555–£653 | £159–£188 | £714–£840/yr |
| 6 kWp | 5,100–6,000 kWh | £666–£783 | £191–£225 | £857–£1008/yr |
Assumptions: Midlands location (1,000 kWh/kWp/yr yield), 50% self-consumption, 26.11p import rate, 15p SEG rate. Actual savings vary by roof orientation, shading, household usage pattern, and SEG deal.
Savings by UK Region
| Region | Solar yield | Annual saving (4kWp) | Payback estimate |
|---|---|---|---|
| Cornwall / South Coast | 1,200 kWh/kWp/yr | £760–£810/yr | ~8–9 years |
| South East / London | 1,100 kWh/kWp/yr | £695–£739/yr | ~9–10 years |
| Midlands (avg UK) | 1,000 kWh/kWp/yr | £632–£672/yr | ~10–11 years |
| North England / Wales | 950 kWh/kWp/yr | £600–£639/yr | ~11–12 years |
| Scotland | 900 kWh/kWp/yr | £569–£605/yr | ~12 years |
Yield data from PVGIS (European Commission). Payback estimates based on £7,000 installed cost for 4kWp, assuming 2026 electricity rates and 15p SEG. Payback improves if energy prices rise.
Why Self-Consumption Matters More Than SEG Rate
The single most important factor in your solar savings is self-consumption — how much of the electricity you generate you actually use in your home, rather than exporting. Here's why:
Self-consumed solar is worth 74% more per kWh than exported solar. This means running your dishwasher, washing machine, and EV charger during the day when your panels are producing is the highest-value thing you can do to maximise solar savings.
25-Year Lifetime Return
4kWp system, Midlands, £7,000 installed cost, 26.11p import, 15p SEG, 50% self-consumption, 0.5% annual panel degradation, 2% electricity price inflation.
Enter your system size, region, usage, and self-consumption rate — get your exact annual savings, SEG income, lifetime return, and payback period.