Solar self-consumption
What is increasing self-consumption worth on 4,000 kWh of annual solar?
Moving from 40% to 65% self-consumption means using an extra 1,000 kWh of generation at home instead of exporting it.
Base illustrative price gap: 28p import / 15p export£130 extra value per year
1,000 kWh extra self-used · 13p/kWh value gap
Why the import/export gap matters
| Scenario | Import rate | Export rate | Value gap | Extra annual value |
|---|---|---|---|---|
| Narrow price gap | 22p/kWh | 15p/kWh | 7p/kWh | £70/yr |
| Base | 28p/kWh | 15p/kWh | 13p/kWh | £130/yr |
| Wide price gap | 32p/kWh | 10p/kWh | 22p/kWh | £220/yr |
What this does not prove
Higher self-consumption is not automatically worth buying extra equipment for. Compare the gain with equipment cost, losses, degradation and any export income you give up.
Import and export rates shown are illustrative sensitivity points. Use your actual tariff and export arrangement in the calculator.