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Understanding the Payback Period for Installing Solar Panels in the UK: Is It Worth It?

Expert Solar Panel Installers in Worthing- William Dexter-Managing Director

Written by

William Dexter

Updated on

April 30, 2024

Solar Panels For Business Worthing | Energize Solar

Understanding the Payback Period for Installing Solar Panels in the UK: Is It Worth It?

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In the pursuit of renewable energy and reducing carbon footprints, solar panels have emerged as a popular choice for homeowners and businesses across the UK. But one crucial aspect that often shapes decisions about solar panel installation is understanding the payback period – the time it takes for the savings on energy bills to cover the initial investment.

In this blog post, we’ll delve into the specifics of the payback period for installing solar panels in the UK, exploring whether it’s a worthwhile investment for UK residents.

What is the Payback Period for installing solar panels?

The payback period represents the duration it takes for the financial benefits of installing solar panels to offset the upfront costs. It’s the point where the savings generated from solar energy production equal the initial investment in the solar panel system. The payback period is a crucial metric in solar panel investments and helps investors evaluate the financial feasibility of investing in solar panels. It indicates how long it will take to recover the initial investment through savings on electricity bills or income generated from incentives like feed-in tariffs or net metering.

A shorter payback period typically signifies a higher ROI. Investors seek shorter payback periods as they indicate quicker returns on their investment, making solar panel installations more attractive from a financial perspective. 

Longer payback periods may increase the perceived risk associated with the investment. Uncertainties such as changes in government policies, electricity prices or technology advancements could impact the financial returns over an extended payback period.

A shorter payback period may make it easier for investors to secure financing or loans for solar panel installations. Lenders typically assess the payback period and expected returns when evaluating loan applications, and shorter payback periods may increase the likelihood of loan approval.

Overall, the payback period plays a critical role in assessing the financial attractiveness and feasibility of solar panel investments, guiding decision-making, risk management, and financial planning processes for investors and stakeholders.

Overview of Solar Energy in the UK

The UK had over 13 gigawatts (GW) of installed solar capacity by the end of 2021. This capacity includes both residential and commercial installations. Solar energy capacity in the UK has been steadily growing over the past decade, with significant increases in installations particularly between 2010 and 2015.

The UK government has historically provided incentives for solar energy installations through schemes like the Feed-in Tariff (FIT) and the Renewable Obligation (RO). Changes in these policies, including reductions in subsidies and the closure of the FIT scheme to new applicants in 2019, have impacted the rate of solar installations. The availability of financial incentives and decreasing installation costs have contributed to residential adoption.

In addition to residential installations, there are also numerous commercial and utility-scale solar projects across the UK. These projects often involve larger solar arrays and can contribute significant amounts of renewable energy to the grid.

Factors Influencing the Payback Period in the UK

Several factors influence the payback period for solar panel installation in the UK:

1. Upfront Costs: The upfront cost of purchasing and installing solar panels is a significant factor in determining the payback period. This cost includes the price of the solar panels, inverters, mounting hardware and installation labour .Talk with a solar installer near you to determine the gross upfront cost of your system.

2. Feed-in Tariff (FiT) Scheme: While the Feed-in Tariff scheme ended in 2019, existing installations and those registered before the deadline still benefit from payments for the electricity generated. This contributed to shorter payback periods for installations made during the scheme’s active period.

3. Smart Export Guarantee (SEG): Introduced as a replacement for the FiT scheme, the SEG requires energy suppliers to pay households and businesses for the surplus renewable electricity they export to the grid. Although SEG rates are typically lower than FiT rates, they still contribute to the financial return on solar panel investments.

4. The Energy Company Obligation (ECO4): ECO4 is a government energy-efficiency scheme in Great Britain, designed to tackle fuel poverty and help reduce carbon emissions. ECO is an obligation placed on energy companies to deliver energy efficiency measures to domestic premises.

5. Electricity Prices: The current and future electricity prices from the grid play a significant role in determining the payback period. As grid electricity prices rise over time, solar panels become more financially beneficial.

6. Homes with higher energy consumption and expensive electricity rates stand to benefit more from solar panel installation as they can save more on their electricity bills, again leading to a shorter payback period.

7. Energy Usage and Electricity Rates: Homes with higher energy consumption and expensive electricity rates stand to benefit more from solar panel installation 

8. Solar Panel Efficiency: The efficiency of solar panels affects their ability to convert sunlight into electricity. Higher efficiency panels can generate more electricity, leading to greater savings and a shorter payback period.

8. Solar Irradiance and Climate: The payback period for solar panel installation may vary by region within the UK due to differences in solar irradiance, energy prices and local regulations. It also varies depending on geographic location and climate conditions. Generally, areas with higher levels of sunlight and higher electricity prices tend to have shorter payback periods due to increased energy generation.

9. Financing Options: The method of financing the solar panel system chosen by the customer, whether through cash purchase, loan or lease, can affect the payback period. Cash purchases typically offer the shortest payback period, while financing options such as solar loans or leases may result in longer payback periods but require little to no upfront investment.

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Calculating the Payback Period:

Calculating the payback period for solar panel installation involves comparing the total upfront cost of the solar panel system to the annual savings on electricity bills generated by the system. 

This calculation helps homeowners assess the financial feasibility of investing in solar energy and determine when they can expect to recoup their initial investment. 

A shorter payback period indicates quicker returns on investment and greater long-term savings, making solar panel installation more financially attractive.

 The formula for calculating the payback period is:

Example Calculation for a Typical Solar Panel Installation in the UK:

Initial Installation Costs: Assume the total cost of installing a solar panel system for a residential property in the UK is £7,500.

Annual Savings: Estimate the annual savings from the solar panel system, including both electricity savings and any government incentives.

  •  Let’s say the total annual savings is £400.

Payback Period Calculation: The payback period is the time it takes for the initial investment to be recovered through savings.

  • Payback Period = Initial Installation Costs / Annual Savings
  • Payback Period = £7,500 / £400 per year ≈ 18.75 years

Interpretation: In this simplified example, the payback period for the solar panel installation is approximately 18.75 years. This means it would take about 18.75 years for the homeowner to recoup the initial £7,500 investment through electricity savings and incentives.

This straightforward calculation provides a basic understanding of the payback period for a typical solar panel installation in the UK.

Is It Worth It?

Despite the variations in payback periods based on individual circumstances, solar panel installation in the UK is generally considered a worthwhile investment with the average payback period for solar panel installation in the UK typically ranging from 8 to 12 years. Here are a few other reasons Solar Panel installation in the UK is a worthwhile investment:

  1. Long-Term Savings: Once the payback period is reached, solar panels continue to generate electricity for decades, leading to substantial savings on energy bills over their lifespan.
  2. Environmental Impact: Solar energy is clean and renewable, contributing to the reduction of greenhouse gas emissions and environmental degradation associated with fossil fuel consumption.
  3. Energy Independence: Generating electricity from solar panels provides homeowners and businesses with greater energy independence, reducing reliance on grid electricity and mitigating the impact of energy price fluctuations.
  4. Increased Property Value: Properties equipped with solar panels often have higher resale values and are more attractive to potential buyers, offering a return on investment beyond energy savings.

With advancements in solar technology, decreasing installation costs and rising energy prices, the payback period for solar panel systems in the UK has been gradually decreasing over the years. As solar panels become more efficient and affordable, homeowners can expect shorter payback periods.


Understanding the payback period for installing solar panels is crucial for homeowners considering solar energy as a sustainable and cost-effective solution. By evaluating factors such as initial investment cost, local incentives, energy usage and financing options, homeowners can make informed decisions about whether solar panel installation aligns with their financial goals and environmental values. While the payback period may vary depending on individual circumstances, solar energy continues to emerge as a viable and rewarding investment for homeowners worldwide.


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