How Much Could Solar Reduce Your Electricity Bills?
There is no honest one-size-fits-all savings figure for solar. The amount you could save depends on how much electricity your system generates, how much of that electricity you use yourself, whether you store or export surplus power, and the tariff you are on.
Where the saving comes from
The simplest way to think about solar is this: when your panels are generating electricity and your home uses that electricity, you avoid buying the same amount from your electricity supplier. The more useful solar electricity you consume at home, the greater the potential reduction in imported electricity.
What affects your savings?
| Factor | Why it matters |
|---|---|
| System size & expected generation | A larger suitable array can generate more electricity, but it must be appropriate for the property and demand. |
| Roof direction, pitch & shading | These influence how much sunlight reaches the panels across the year. |
| Where you live | Solar generation varies geographically; southern England generally receives more solar irradiation than northern locations. |
| When you use electricity | Using appliances while the system is generating can increase self-consumption. |
| Battery storage | A battery can store surplus generation for later, potentially increasing the amount of solar electricity you use yourself. |
| Electricity import tariff | The value of avoiding imported electricity depends on what you would otherwise pay per kWh. |
| Export tariff | Eligible surplus electricity may earn an export payment; tariff rates and terms vary by supplier. |
Can I get paid for electricity I do not use?
Potentially. The Smart Export Guarantee (SEG) requires participating electricity suppliers to offer payment for eligible low-carbon electricity exported to the grid. Suppliers set their own rates and terms, so customers should compare available export tariffs. Eligibility requirements apply, including appropriate metering and certification.
GS Solar Savings Estimator
An educational estimate that shows ranges and the assumptions behind them - not a guaranteed saving and not a quotation.
Illustrative estimate
Fill in a few details and we will show an illustrative generation and self-consumption range, with the assumptions behind it. No contact details needed to see the result.
This is an illustrative estimate, not a quotation or guarantee. Actual generation and savings depend on your property, system design, electricity use, energy prices, export tariff and other factors. GS Solar will provide a tailored estimate with your system proposal.
Prefer an independent calculator?
The Energy Saving Trust solar calculator is a useful independent reference alongside our estimator.
For a figure based on your actual property
Get your free solar quote and we will estimate generation for your roof and usage.