The public toilets by the River Wharfe in Ilkley now generate their own electricity. That is the news from the Ilkley Chat Website, as reported by Ilkley Chat Website. A solar array on the roof of a municipal convenience is not going to decarbonise the grid by itself. But it tells you something about where we are with solar in Britain: when even the smallest, least glamorous public buildings are getting panels, the technology has crossed a threshold.
What this means for household solar economics
The average UK household uses about 2,700 kWh of electricity a year. A typical 4 kW solar system, roughly 10 to 12 panels, can generate around 3,500 kWh annually, depending on orientation and location. That is more than enough to cover a home’s daytime usage, with surplus exported to the grid under the Smart Export Guarantee at roughly 5–15p per kWh.
Installation costs have fallen by more than 60% over the past decade. A typical 4 kW system now costs between £5,000 and £8,000, according to the Energy Saving Trust. Payback periods range from 10 to 15 years, assuming you use about half the electricity you generate. Add a battery, another £2,000 to £5,000, and you can double your self-consumption to 70–80%, cutting payback to 8–12 years.
Yet the real gain for most homeowners is not the export income. It is the reduction in what you buy from the grid. With Ofgem’s price cap at £1,928 from January 2025, every kilowatt-hour you generate yourself saves you roughly 24p. A household that uses 60% of its solar output can cut its annual electricity bill by £300 to £600.
EPC impact and property value
Solar panels can lift an Energy Performance Certificate from band D to band C, or from C to B. That is not a theoretical nicety. A one-band improvement adds an average of 2–4% to a property’s sale price, according to data from Nationwide and the Department for Levelling Up. On a £300,000 house, that is £6,000 to £12,000, more than the cost of the panels themselves.
The catch is that not every roof is suitable. South-facing roofs at a 30–40 degree pitch are ideal. East-west arrays can still work but generate 15–20% less. And if your roof needs replacing within five years, you should do that first, panels last 25–30 years, and re-roofing later means removing and reinstalling them at a cost of roughly £1,000.
Ofgem’s latest data shows that 1.7 million UK homes now have solar panels, up from 1.2 million in 2020. That is still only about 6% of the housing stock. But the growth rate is accelerating: installations in 2024 ran 30% higher than the year before. The public toilet in Ilkley is a sign that the technology has become so routine that even councils with tight budgets are investing in it.
What to do next if you are considering solar
Check your roof’s orientation and shading using a free online tool such as the Energy Saving Trust’s solar calculator. Get at least three quotes from MCS-certified installers, the Microgeneration Certification Scheme is the industry standard required for grid connection and the Smart Export Guarantee. Ask for a breakdown of panel type, inverter brand, and estimated annual generation in kWh, not just a lump-sum price.
If you cannot afford the upfront cost, consider a solar lease or a zero-interest loan. The government’s Boiler Upgrade Scheme does not cover solar, but some local authorities offer interest-free loans for renewables. Barclays, NatWest, and other lenders now offer green home improvement loans at rates as low as 4.9% APR for solar installations.
One final detail: planning permission is not required for most rooftop solar in England, thanks to permitted development rights. But if you live in a listed building or a conservation area, check with your local planning authority before ordering panels. Ilkley’s public toilets got their panels without fuss. With a bit of homework, your home can too.
Frequently Asked Questions
A typical 4 kW system can save a household between £300 and £600 per year, depending on how much of the generated electricity you use directly. If you add a battery, savings can rise to £700 or more by reducing the amount you draw from the grid during peak evening hours.
Yes. An EPC improvement of one band, say from D to C, adds an average of 2–4% to a property's value, according to Nationwide data. On a £300,000 home, that is £6,000–£12,000, often exceeding the installation cost.
