Yes — 50% self-consumption saves £490/year from a £6,750 investment = 13.8yr payback. Strong ROI even at 50%. Add a battery for 80%.

How Much Electricity Saved?

By Home Solar Guide Team|Updated 18 March 2026|money

Independently written | Evidence-based | Sources cited

Electricity saved — 2,000-3,200 kWh saved per year = 50-85% of average household consumption.

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How much electricity do solar panels save?

A 4kW solar system saves 2,000-3,200 kWh of grid electricity per year: WITHOUT BATTERY: 2,000 kWh saved (50% self-consumption × 4,000 kWh generated). At 24.5p/kWh: £490 saved on grid imports. WITH BATTERY: 3,200 kWh saved (80% self-consumption). At 24.5p/kWh: £784 saved. Average UK home uses ~3,700 kWh/year. So solar replaces 54-86% of grid electricity with free solar. The remaining 14-46% comes from the grid — mainly winter evenings.