More than 5,500 solar panels now cover the roofs and ground of an air traffic control centre in Hampshire. The site, which handles flights over southern England, will generate roughly 2.1 gigawatt-hours of electricity each year — enough to power around 600 homes. As reported by Portsmouth.co.uk, the installation is one of the largest public-sector solar projects in the region. For the homeowner reading this in a three-bed semi in Southampton or a flat in Portsmouth, the question is not whether solar works — it’s whether your roof can do the same.
Why the air traffic centre matters to your bill
Every large-scale solar installation in the UK does two things. First, it pushes down the capital cost of panels through economies of scale. Second, it feeds more zero-carbon electricity into the grid, which helps lower wholesale prices. Ofgem data shows that solar now accounts for roughly 5% of UK electricity generation, up from virtually nothing in 2010. The more panels we install as a country, the cheaper the technology gets for everyone. A typical 4 kW domestic system today costs between £5,000 and £7,000, including installation — about half what it did a decade ago.
What it costs a typical 3-bed semi
A household in a 3-bed semi with south-facing roof space can expect a 4 kW system to generate around 3,500 kWh per year. At current electricity rates of roughly 27p per kWh, that’s a saving of £945 on the bill — assuming you use all the power yourself. In practice, most households export about 40% of what they generate, earning around 15p per kWh under the Smart Export Guarantee (SEG). That adds roughly £210 a year. The Energy Saving Trust estimates a typical payback period of 10 to 15 years, depending on orientation and shading. The catch: not every roof works. North-facing, heavily shaded, or listed properties may see lower returns.
Who qualifies — and who doesn’t
Any household with a suitable roof can install solar panels. No planning permission is needed in most cases, though listed buildings and conservation areas require consent. The SEG is mandatory for suppliers with more than 150,000 customers, so most households can find a tariff. The UK government’s Great British Insulation Scheme does not cover solar, but the Boiler Upgrade Scheme offers £7,500 for heat pumps — often paired with solar to maximise savings. The key date: SEG rates are fixed per tariff, so compare offers from Octopus, EDF, and others before signing.
What this misses
But the air traffic centre’s 5,500 panels are not a perfect analogy for your home. The centre has flat roofs, no shading, and professional maintenance. Your home has chimneys, dormers, and trees. The installation cost per panel at scale is far lower than a domestic array. Yet the principle holds: solar works in the UK. Even on a cloudy day, panels generate roughly 10% of their rated capacity. The average UK home can cut its carbon footprint by 1.5 tonnes per year with a 4 kW system. That’s the equivalent of planting 25 trees annually.
For homeowners: check your roof orientation on Google Maps or a solar calculator from the Energy Saving Trust. If it’s south-west to south-east and unshaded, get three quotes from MCS-certified installers. The SEG tariff you choose matters — fixed-rate deals above 15p/kWh are available. Act before the April 2025 SEG review, when rates may drop.
Frequently Asked Questions
A typical 4 kW system can save between £200 and £500 per year on electricity bills, depending on how much power you use at home versus export. The Smart Export Guarantee pays for excess electricity sent to the grid.
In most cases, solar panels are permitted development and do not require planning permission. Exceptions include listed buildings, properties in conservation areas, or panels that protrude more than 200mm from the roof.
