How much can you save with solar panels?

These calculations are based on averages and are intended to provide a broad overview of the bill savings you can expect from installing solar panels, a battery and signing up to our Solar Savings export tariff.

Your actual savings and export payments will depend on the size of your solar installation, how much of your solar electricity you are able to use, and the volume you export.  

If you decide to get a quote from Good Energy Solar, we do the maths for you. You will receive a personalised estimate of your solar bill savings as part of the bespoke proposal for your home.  

Showing our working 

Average annual energy bill 

Ofgem TDCV for a 2-3 bed house (kWh)2700
Unit rate (Exc. VAT) (£)0.25
Standing charge (£)0.65
Standing charge per year (£)237.98
Total annual bill (£)910.28
Ofgem’s typical domestic consumption values for electricity used each year by a medium-sized home. 
Good Energy Standard Variable tariff unit rates and standing charges as of 1.10.2024.

The assumptions behind average solar generation and export volumes

  • We’ve based our calculations on a 10 panel solar array with a capacity of 3.68kW; and a 10kW battery. 
  • A conservative estimate for the volume of electricity a solar array of this size is able to generate in a year is 3224kWh. This is based on a load factor of 10%. Load Factor is a measure of how much electricity a renewable generator will realistically produce over a year compared to its theoretical maximum output. To get estimated generation over a year, we multiply the capacity of the solar array by hours in a day and days in the year, and finally apply the load factor 
  • Households with solar panels but no battery are estimated to export around 50% of the solar power they generate. This is based on the deemed export volume agreed by the government’s Feed-in Tariff scheme
  • Households with solar panels and a battery are estimated to use 75% of the solar power they generate, and export 25%.  
  • The earnings from exporting solar power are based on the current Good Energy Solar Savings export rate, which is 15p/kWh. To get the Solar Savings Exclusive rate of 40p/kWh (for a 12 month term), you must have solar panels and a battery installed by Good Energy Solar. 

Solar panels + Solar Savings export tariff 

Array size (kW)3.68
Load factor0.1
Annual generation (kWh)3224
Assumed export volume50%
Solar exported (kWh)1612
Solar used (kWh)1612
Elec bill saving (£)401
Solar Savings rate (£)0.15
Solar Savings earnings (£)241.78
Total solar bill savings (£)643.12

Solar panels + battery + Solar Savings Exclusive Export Tariff

For customers with solar panels and a battery installed by Good Energy Solar. Solar Savings Exclusive is a 12 month tariff, after that time you will roll onto Solar Savings.

Assumed export volume25%
Solar export (kWh)806
Solar used (kWh)2418
Elec bill saving (£)579.30
Solar Savings Exclusive rate (£)0.4
Solar Savings Exclusive earnings (12 month tariff) (£)322.37
Total solar bill savings (first 12 months) (£)924.39
Total solar bill savings (after 12 month tariff ends) (£)722.91

How Solar Savings compares to the Feed-in Tariff export rate

If you receive Feed-in Tariff payments, current export rates for 2024-2025 are between 5.07 and 7.14p per kWh.
Here’s how the top paying FIT export rate compares to Solar Savings.

Annual generation (kWh)3224
Assumed export volume50%
Solar export (kWh)1612
Feed-in Tariff export rate0.0714
Feed-in Tariff export payment115.1
Solar Savings earnings (£)241.78
Benefit to you (£)126.68

Solar Savings is a variable tariff. The rate you receive can go up or down. Your savings will depend on the size of your solar installation, how much electricity you use at home and how much you export. This page is intended to provide average estimates only.