What is realistic self-sufficiency?

70-85% with solar + battery. You still need some grid electricity in winter evenings and during extended cloudy periods. With a smart tariff, this grid import is very cheap.

Technically yes — but costs £15,000-£40,000 (2-3x more than grid-connected) and requires a backup generator for winter. Not practical or cost-effective for most UK homes.

Solar Panels for Self-Sufficiency

By Home Solar Guide Team|Updated 20 March 2026|guide

Independently written | Plain-English guide

Solar self-sufficiency levels — 70-85% self-sufficiency is practical and affordable. 100% is possible but expensive.

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How self-sufficient can solar make you?

Realistic UK solar self-sufficiency: Solar only (no battery): 30-50% of electricity self-generated. Solar + battery: 70-85%. Solar + battery + smart tariff (Octopus Go): 85-95% (remaining imports are very cheap at 7.5p). Full off-grid (100%): requires 8-10kW panels + 20-30kWh battery + generator. Cost: £15,000-£40,000. For most homes: 70-85% with solar + battery at £9,000-£14,000 is the sweet spot — maximum comfort at reasonable cost.