Export income estimator
This tool helps you estimate the annual income you could receive by exporting excess electricity to the national grid through a Smart Export Guarantee (SEG) tariff.
To get an accurate estimate, you’ll need to know your system’s estimated annual generation and your export tariff rate.
A typical 4kWp solar system in the UK generates around 3,500kWh per year.
How much of your generated electricity do you use at home? (Typical: 25% without battery, 70% with battery).
Standard SEG rates are currently around 5p to 15p per kWh.
How the calculation works
We calculate your export income based on the following formula:
- Total Generation: The total amount of electricity your solar panels produce in a year (in kWh).
- Self-consumption: The percentage of that electricity you use in your home. This is energy that isn’t exported.
- Exported Energy: Total Generation minus the energy used at home.
- Income: The Exported Energy multiplied by your export tariff rate (usually in pence per kWh).
Typical self-consumption rates
- Standard home (no battery): 20% to 30% self-consumption. Most energy is generated during the day when people are out.
- Home with a battery: 60% to 80% self-consumption. Excess energy is stored and used in the evening.
- Home with EV charging: 50% to 70% self-consumption, if charging during the day.
Next steps
If you’re happy with your estimated income, make sure you:
- Compare tariffs: Check our Tariff comparison guide to find the best SEG rates.
- Check your equipment: Ensure you have a smart meter and an MCS-certified installation to be eligible for payments.
- Apply to a supplier: Contact an SEG licensee to start your application.
Written by NetZeroNow