Are Solar Panels Worth It in the UK in 2026?

The short answer for most UK households in 2026: yes, with a 6–12 year payback depending on system size, tariff, and household pattern. The maths is meaningfully better than it was in the post-FiT slump of 2020–22 because installed costs have dropped ~20% in real terms, electricity import prices have nearly doubled, and SEG export rates have moved up off the floor.

The baseline numbers (UK, 2026)

• Yield: ~950 kWh/kWp/year on a south-facing, unshaded UK roof (Midlands typical, ~850 in the north, ~750 in Scotland)
• Import price: 24.67 p/kWh (April–June 2026 Ofgem cap)
• Export price: 12 p/kWh (Octopus Outgoing Fixed, the best no-tie-in fixed rate in 2026)
• Self-consumption (no battery): 35–45% for a typical household; higher with EV charging or heat pump
• Self-consumption (with 10 kWh battery): 70–85%

Worked example: 4 kW solar-only on a south-facing roof

• Install cost: ~£7,000 (after 0% VAT)
• Annual generation: 4 kWp × 950 = 3,800 kWh/year
• Self-consumed (40%): 1,520 kWh × 24.67 p = £375 of import bill saved
• Exported (60%): 2,280 kWh × 12 p = £274 of SEG income
• Combined annual benefit: ~£649/year
• Simple payback: 7,000 ÷ 649 ≈ 10.8 years

Run the same numbers with EV-charging-from-solar bumping self-consumption to 55% and with Outgoing Agile averaged at 15 p/kWh on the export side: annual benefit climbs to ~£820/year, payback drops to ~8.5 years.

Worked example: 4 kW solar + 10 kWh battery

• Install cost: ~£11,500 (£7,000 solar + £4,500 battery, both at 0% VAT)
• Annual generation: 3,800 kWh/year
• Self-consumed (75%): 2,850 kWh × 24.67 p = £703 saved
• Exported (25%): 950 kWh × 12 p (or 15 p+ on Agile with automation) = £114–£170 SEG income
• Combined annual benefit: ~£820–£900/year
• Simple payback: 11,500 ÷ 860 ≈ 13.4 years (or 11 years on Agile with automation)

What pushes payback down (good) or up (bad)

Down (faster payback):

• EV charging from solar (huge — daytime EV charging shifts self-consumption towards 70%+ without a battery)
• Heat pump (more daytime electricity demand for DHW in shoulder seasons)
• Home working / retired household / school-age children at home (daytime demand)
• Hot water diverter (Eddi, Solar iBoost) — pours surplus solar into the immersion at 20p/kWh effective
• Outgoing Agile + battery + automation (peak slot exports at 25–40 p/kWh)
• Future electricity price rises (real terms — most modelling assumes 2–3% real inflation in electricity prices)

Up (slower payback):

• East/west or partially shaded roof (~15–25% lower yield)
• Empty house during the day (low self-consumption, hostage to SEG rate alone)
• SEG floor rate (4.1 p/kWh basic) instead of shopping for the best
• Inverter replacement at year 12–15 (~£1,000)
• Premium panel choice for a roof that doesn't need maximum efficiency per m²

Beyond payback: the system keeps producing

Panels are warrantied 25–30 years; most still produce 85–90% of original output at year 25 and continue working for years after. Inverters typically need replacement once around year 12–15 (~£1,000). After payback, you're getting effectively free electricity (and SEG income) for the next 10–15 years.

Over a 25-year horizon, a £7,000 solar install at 10-year payback generates roughly £10,000 of additional positive return after costs — and that's before any allowance for real-terms electricity price inflation, which would push the figure significantly higher.

When solar makes less sense

• North-facing roof — don't bother
• Heavily shaded roof with no microinverter / optimiser option budget
• You plan to move house within 3–5 years — the asset value uplift typically doesn't cover the install cost over short hold periods
• Listed building or conservation area where panels would face the highway — planning permission can take 6+ months and sometimes gets refused
• Very low annual electricity use (under ~2,500 kWh/year) — absolute savings can't service the install cost on most system sizes

The 5-minute test

If three or more of these are true, solar is almost certainly worth it:

• You own the home and plan to stay 5+ years
• Your roof faces south, east or west (not north) and isn't heavily shaded
• You're home some of the day (or have an EV / heat pump that draws daytime electricity)
• Your current electricity bill is over £900/year
• You're not planning to extend or re-roof in the next 5 years