Are Solar Panels Worth It in the UK? Savings, Payback and Who Benefits Most

Sep 25

7 min read

For many UK homes, yes. Current Energy Saving Trust estimates put a typical 4.5kWp system at around £7,600, with a modelled payback period of roughly 9 to 12 years depending on location and household. Panels typically last 25 years or more.

How much of the electricity you use yourself matters a great deal. Based on the current Energy Saving Trust figures used in this guide, electricity you use at home is worth more than twice as much as a typical exported unit.

Whether solar is worth it for your home therefore depends on more than how much your panels generate. When you use electricity, what you are paid for exports, and whether you run a heat pump or an electric car all change the answer.

What "worth it" really means for solar panels

Solar panels pay you back in two ways:

Avoided bills. Electricity your panels produce and you use at home is electricity you do not buy from the grid.
Export income. Electricity you do not use can be sold back to the grid through a Smart Export Guarantee (SEG) tariff.

Against those, you weigh the upfront installation cost and the running costs over the system's life, mainly an inverter replacement. "Worth it" means the value of avoided bills and export income comfortably outweighs those costs within the life of the system.

How much do solar panels cost, and how long do they last?

	Energy Saving Trust figure
Typical system size	Around 4.5kWp, usually about 12 panels
Roof area needed	Roughly 20 to 30m²
Typical installed cost	Around £7,600
Panel lifespan	25 years or more
Inverter replacement	Usually needed after around 12 years

Source: Energy Saving Trust, last updated August 2026. These are current typical figures, not fixed prices. Costs vary with system size, roof access and whether panels are integrated into the roof.

Installing solar panels on a home currently carries 0% VAT. This applies until 31 March 2027, after which HMRC guidance says it reverts to 5%.

The size of system your home suits depends on your electricity use and roof space. Our guide to how many solar panels your home needs explains how that is worked out.

How much could solar save you?

Using your own electricity versus exporting it

This is the most useful idea for understanding solar value.

Using it: when you use solar electricity as it is generated, each unit saves you the price you would otherwise pay your supplier.
Exporting it: when you export it, you receive your SEG rate instead.

The Energy Saving Trust currently puts a typical SEG payment at around 12p per unit, and notes that you would normally pay more than twice that to buy electricity. On those figures, each unit you use yourself is worth considerably more than each unit you export.

Both import prices and export rates change over time, so the gap between them can widen or narrow. Whatever the rates, the balance between using and exporting your solar has a direct effect on payback. That is why two identical systems on neighbouring homes can deliver different value.

How export payments work

Under the Smart Export Guarantee, larger electricity suppliers must offer eligible small generators a tariff for electricity exported to the grid. Ofgem sets out the rules:

Suppliers set their own rates and terms, but the rate must always be above zero.
Payments are based on export meter readings.
The scheme covers Great Britain. In Northern Ireland, ask your supplier whether it offers an export tariff.

Rates vary between suppliers and change over time, so it is worth comparing them once your system is installed.

How long do solar panels take to pay for themselves?

The Energy Saving Trust has modelled payback periods, including export payments, for different locations and household patterns.

Location	Home all day	Home half the day	Out all day
London	9 years	9 years	9 years
Manchester	10 years	10 years	11 years
Aberystwyth	9 years	9 years	10 years
Stirling	11 years	11 years	12 years

Source: Energy Saving Trust, based on fuel prices as of July 2026 (England, Scotland and Wales). These are modelled estimates that will change as prices change. They are not guarantees for any individual home.

Two things stand out:

Location matters. Homes further south receive more sunlight.
Occupancy makes a smaller difference than many people expect, at most around a year in these figures. That is partly because current export payments give reasonable value for electricity you do not use. If export rates were to fall, using more of your own solar would matter more.

Which households get the most from solar?

Household	Why solar value differs
At home during the day	More solar is used directly, so more units offset the import price
Out at work all day	More electricity is exported at the lower SEG rate, unless appliances are timed to run in daylight
Heat pump home	Higher electricity demand means more opportunity to use solar, especially in spring and autumn
Electric car owner	Charging during daylight turns surplus solar into avoided fuel costs

At home during the day

If someone is home during daylight, for example working from home or retired, the household naturally uses more solar as it is produced. Running the dishwasher, washing machine or other appliances in the middle of the day adds to this.

Out at work all day

A household that is out all day can still benefit, but more of its generation is exported. Timers on appliances can shift some use into daylight hours.

Homes with a heat pump

A heat pump increases a home's electricity use, which creates more demand that solar can meet.

The overlap is smallest in midwinter, when heating demand is highest and solar generation is lowest. It is strongest in the spring and autumn, and for hot water through the year.

Energy Saving Trust research published in 2026 modelled over a million combinations of technologies and tariffs. Homes combining a heat pump, solar panels and a battery on suitable tariffs cut energy bills by around £800 a year in general. These were scenario based results, and real outcomes depend on the home, how it uses energy and the tariff.

If you are weighing up a heat pump as well, our guide to heat pump running costs explains what affects them.

Homes with an electric car

An electric car is a large, flexible electricity load. Charging it while the panels are generating, particularly at weekends or for anyone working from home, uses solar that might otherwise be exported.

Does a battery make solar more worthwhile?

A battery stores surplus solar for use in the evening, which increases how much of your generation you use yourself.

However, Energy Saving Trust research found that, at current export rates, the extra savings from adding a battery to solar panels may not be enough on their own to justify the cost. A battery can still make sense for other reasons, including protection against future changes to export rates.

We cover this in detail in our guide to whether a home battery is worth it.

If you already have panels, see our guide to adding battery storage to existing solar panels.

What can reduce the value of solar?

Roof direction. South facing roofs perform best. The Energy Saving Trust says east or west facing systems tend to produce around 15 to 20% less, and north facing roofs are not recommended.
Shading. Trees, chimneys or nearby buildings can reduce output. Optimisers can limit the effect of shading, but they do not add output on an unshaded roof.
Low daytime use combined with a low export rate. This reduces the value of each unit generated.
A system that does not match your usage. A system that is too small or too large can weaken the return.

A proper survey should assess these points before any quote. Our guide to what a good solar PV survey should assess explains what to expect.

Is there a grant for solar panels?

There is no dedicated UK Government grant for solar panels at present.

The government's Warm Homes Plan is set to include fully funded support for low income households, and low or zero interest loans for other homeowners. The details are still being developed. The Energy Saving Trust tracks updates on its solar panels page.

The 0% VAT rate on residential solar installations also reduces the upfront cost until 31 March 2027.

How to find out whether solar is worth it for your home

The most reliable way to judge solar value is to base it on your own situation:

your annual electricity use
when during the day you use it
your roof's direction and shading
whether you plan a heat pump, an electric car or a battery in future

Puraflow Renewables is MCS certified and installs solar PV systems alongside heat pumps and battery storage. A survey can take account of how your home uses energy now and any plans you have for the future.

When you are ready to see what solar could look like for your property, a survey is the next step.

Frequently asked questions

Do solar panels work on cloudy days?

Yes. Solar cells generate electricity from daylight, not only direct sunshine, although output is higher in bright conditions.

Do solar panels still generate in winter?

They do, but output is much lower in winter than in summer because days are shorter and the sun is lower. Payback estimates are based on a full year of generation.

Can I get paid for exporting electricity in Northern Ireland?

The Smart Export Guarantee applies in Great Britain only. In Northern Ireland, check with your electricity supplier whether it offers an export tariff.

Will I still need to buy electricity from the grid?

Yes. Solar reduces how much you buy, but most homes still import electricity in the evening, overnight and on darker winter days. A battery can reduce this further.