Energy prices in the UK have been volatile for several years and many experts expect electricity costs to continue rising as the country transitions to cleaner energy. For homeowners across the South East, this uncertainty has led to one important question:
“Is installing solar panels now cheaper than continuing to rely on grid electricity?
In this guide, we compare the 10 year cost of buying electricity from the grid versus generating your own power with solar panels, using realistic figures from households in the South East. We’ll also explore how solar helps protect homeowners from future price increases.
Why Energy Prices in the UK Keep Rising
Electricity costs in the UK have increased significantly over the past decade due to several factors:
- Global gas price volatility
- Increasing infrastructure costs for the National Grid
- Inflation and wholesale energy market fluctuations
- Investment in the UK’s energy transition
Even though the UK energy price cap changes several times per year, the overall long term trend has been upward. For homeowners in the South East – including Essex, Kent, Suffolk and the surrounding counties – this means household energy costs are likely to remain unpredictable.
Installing solar panels allow homeowners to generate their own electricity and reduce reliance on suppliers.
Typical Household Electricity Use in the South East
The average UK home uses roughly 2,700-3,200 kWh of electricity per year. For this comparison, we will assume:
- Annual electricity use: 3,000 kWh
- Current electricity price: ~30p per kWh
- Estimated annual price increase: 5%
These figures reflect realistic projections used by energy analysts and solar installers when estimating solar savings.
Cost of Grid Electricity Over 10 Years
If electricity prices rise at a modest 5% per year, the cost of buying electricity from the grid grows significantly.
| Year | Estimated Electricity Price | Annual Cost |
| Year 1 | £0.30/kWh | £900 |
| Year 3 | £0.33/kWh | £990 |
| Year 5 | £0.36/kWh | £1,080 |
| Year 7 | £0.40/kWh | £1,200 |
| Year 10 | £0.47/kWh | £1,410 |
Total estimated electricity spend over 10 years – £11,000-£12,500.
This assumes no major energy crises or price spikes – something the UK has already experienced several times since 2021.
Cost of Solar Panels Over 10 Years
A typical residential solar installation in the South East includes:
- 8-12 solar panels
- 3.5-4.5 kW system size
- Installation or a south or west facing roof
Average installation cost:
£6,000-£8,000
Solar panels typical generate 3,200-3,800 kWh per year in the South East, meaning they can cover most or all of a household’s electricity needs.
Additional benefits include:
- Smart Export Guarantee payments for surplus electricity exported to the grid
- Reduced reliance on energy suppliers
- Protection from future electricity price increases
Over 10 years, many homeowners recover a significant portion of their installation cost through bills savings and export payments.
10 Year Cost Comparison
Here’s a simplified comparison.
| Option | Estimated 10 Year Cost |
| Grid electricity only | £11,000 – £12,500 |
| Solar panels installed | £6,000 – £8,000 |
Even without factoring in export payments, solar panels can reduce electricity costs by thousands of pounds over the first decade alone. Considering solar panels last a minimum of 30 years, with most generating power efficiently for 40 years or more, the long term financial advantage becomes even greater.
How Solar Protects You From Future Price Rises
One of the biggest advantages of solar panels is price stability. When you install solar panels, the majority of your electricity becomes free once the system is installed. This means:
- Future energy price increases have less impact on your household
- You gain greater control over your energy costs
- Your home becomes more energy independent
Many homeowners in the South East now view solar panels as a long term hedge against rising energy prices.
Additional Savings with Solar Battery Storage
Some homeowners choose to add battery storage to their solar system. A solar battery allows you to store unused daytime electricity for use in the evenings or during periods of high cost grid electricity, further reducing your reliance on the grid. Although batteries add to the upfront cost, they can increase self-consumption and maximise long term savings.
Are Solar Panels Worth It for Homes in the South East?
For most households, the answer is increasingly yes. The South East receives some of the highest solar irradiation levels in the UK, meaning solar panels perform particularly well compared to other regions.
Benefits include:
- Lower electricity bills
- Reduced exposure to rising energy prices
- Lower carbon emissions
- Potential increase in property value
- Government backed export payments
With energy costs expected to remain unpredictable, solar panels are becoming one of the most practical long term energy investment strategies homeowners can make.
Why Homeowners Trust SolarTherm UK
At SolarTherm UK we specialise in residential solar panel installation across the South East. Our team provides expert system design, tailored to your home. With over 15 years of experience installing only the highest quality solar PV panels, inverters and battery storage systems, our professional and MCS accredited teams are ready to help you start saving on your electricity bills.
At SolarTherm UK, all our quotes and performance estimates are verified by independent third party EPVS (Energy Performance Validation Scheme), ensuring our data is accurate and not over inflated.
We help homeowners understand how much solar could save them before they install, ensuring every system delivers real long term value.
Get a Solar Savings Estimate
If you’re considering solar panels, the best place to start is with a personalised assessment. Contact SolarTherm UK today for a free, no obligation quote and design, tailored to your property, usage and future energy needs. No hard sell, just honest, expert advice – and the time you need to make an informed decision.
Your home. Your energy. Your future.
FAQs
Do solar panels still save money if energy prices fall?
Yes. Even if electricity prices stabilise, solar panels reduce the amount of energy you need to buy from suppliers, meaning long-term savings remain significant.
How long do solar panels last?
Most solar panels last 25–30 years, with many still producing electricity well beyond that timeframe.
Do solar panels work during cloudy UK weather?
Yes. Solar panels generate electricity from daylight, not just direct sunshine, so they continue to produce power even on cloudy days.
Can I sell excess electricity back to the grid?
Yes. Through the Smart Export Guarantee (SEG), homeowners can receive payments for electricity their solar panels export.
