Worked examples

Solar self-consumption value examples

Compare the value of increasing solar self-use across 2,000–8,000 kWh annual generation. Import/export price gaps remain explicit.

All worked examples

2,000 kWh annual generation40%→65% self-use adds ~£65/yr at a 13p/kWh import/export value gap

2,500 kWh annual generation40%→65% self-use adds ~£81/yr at a 13p/kWh import/export value gap

3,000 kWh annual generation40%→65% self-use adds ~£98/yr at a 13p/kWh import/export value gap

3,500 kWh annual generation40%→65% self-use adds ~£114/yr at a 13p/kWh import/export value gap

4,000 kWh annual generation40%→65% self-use adds ~£130/yr at a 13p/kWh import/export value gap

5,000 kWh annual generation40%→65% self-use adds ~£162/yr at a 13p/kWh import/export value gap

6,000 kWh annual generation40%→65% self-use adds ~£195/yr at a 13p/kWh import/export value gap

7,000 kWh annual generation40%→65% self-use adds ~£228/yr at a 13p/kWh import/export value gap

8,000 kWh annual generation40%→65% self-use adds ~£260/yr at a 13p/kWh import/export value gap

Open the solar self-consumption calculator

Self-consumption is about timing as well as generation

The annual-generation range above illustrates how much solar energy might be produced, but the value of that energy depends on when the household uses electricity. A home occupied during the day may naturally consume a larger share of solar generation, while an evening-heavy household may export more unless loads are shifted or storage is added.

Every kWh used directly can avoid an imported kWh, but every kWh exported may earn an export payment. The value of increasing self-consumption is therefore the avoided import price minus the export value that would otherwise have been received, not simply the full retail electricity rate.

Use measured demand if available

Half-hourly smart-meter data provides a much better picture than annual consumption alone. If you do not have it, test several self-consumption percentages rather than relying on one assumption. The calculator is intended to show how sensitive the result is to that percentage and to your actual import and export tariffs.

Inputs on these pages are illustrative. Replace them with your own tariff, product, quote or household figures in the linked calculator before making a decision.