How much you can save with solar 

Solar panels + battery: £519.75 

Solar panels, battery + Solar Savings Exclusive export tariff: £633.63

The calculations on this page 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. These are based on averages – 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.  

That’s quite a lot of variables to get your head around!

Thankfully, 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) (£)0.2282
Standing charge (£)0.5894
Standing charge per year (£)215.131
Total annual bill (£)831.271
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 1.4.2024. 

The assumptions behind average solar generation and export volumes

  1. Domestic solar installations in the UK can be up to 3.68kW in capacity before they need approval to be connected to the energy grid. EU research estimates that the average domestic solar array in the UK is 3.25kW. 
  1. A conservative estimate for the volume of electricity a solar array of this size is able to generate in a year is 2847kWh. 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 

  1. 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
  1. Households with solar panels and a battery are estimated to use 80% of the solar power they generate, and export 20%.  
  1. 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 20p/kWh, you must have solar panels and a battery installed by Good Energy Solar. 

Solar panels + Solar Savings export tariff 

Array size (kW)3.25
Load factor0.1
Annual generation (kWh)2847
Assumed export volume50%
Solar exported (kWh)1423.5
Solar used (kWh)1423.5
Elec bill saving324.84
Solar Savings rate (£)0.15
Solar Savings earnings (£)213.53
Total solar bill savings (£)538.37

Solar panels + battery + Solar Savings Exclusive Export Tariff

(For customers with solar panels and a battery installed by Good Energy Solar). 

Assumed export volume20%
Solar export (kWh)569.4
Solar used (kWh)2277.6
Elec bill saving (£)519.74832
Solar Savings Exclusive rate (£)0.2
Solar Savings Exclusive Earnings (£)113.88
Total solar bill savings (£)633.63

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)2847
Assumed export volume50%
Solar export (kWh)1423.5
Feed-in Tariff export rate0.0714
Feed-in Tariff export payment101.64
Solar Savings earnings (£)213.53
Benefit to you (£)111.89

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.