Solar Payback Period 2026
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What is the 2026 solar payback period?
UK solar payback period in 2026: 4kW without battery: 11.6 years (£6,750 ÷ £580/year). 4kW with battery: 14.3 years (£11,750 ÷ £820/year). 4kW + battery + Octopus Flux: 10.7 years (£11,750 ÷ £1,100/year). These are the fastest payback periods in UK solar history — thanks to electricity at 24.5p/kWh (Ofgem Q1 2026) and 0% VAT. Pre-2020 (14p/kWh): payback was 15-18 years. The energy crisis HALVED payback periods.
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