Glamorgan
Solar panels in Swansea, sized to your roof.
Twelve panels (6.36 kWp) here make about 6,510 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
Get my free quote
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
or call 07782 219224
- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
What a roof in Swansea can generate
Swansea's best month is May, at 132.9 kWh per kWp; December manages 22.2. Over the year that comes to 1,023 kWh per kWp, 9% above our Glamorgan county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 30.2 |
| February | 53.9 |
| March | 91.2 |
| April | 122 |
| May | 133 |
| June | 131 |
| July | 129 |
| August | 114 |
| September | 96.3 |
| October | 62.9 |
| November | 38 |
| December | 22.2 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 1,023 kWh per kWp in Swansea against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Swansea 11% above it.
How Swansea compares
Swansea is classed as a city in the House of Commons Library settlement data, home to 180,562 people. It is one of 32 Glamorgan towns we track, and it ranks 15th of 32 for solar yield. Its 1,023 kWh per kWp a year works out at 2.80 peak sun hours a day, and running the standard 12 panel model here splits the return into £247 of savings from generation you use yourself and £668 of export income at 12p, with about 5,570 kWh a year going to the grid.
Every figure here assumes a clear, south-facing roof at 35 degrees. Yours will differ, which is what the free design call is for; until then, the calculator below tests panels, batteries and export rates on Swansea's own yield.
Planning applications in Swansea go to its own council, and the House of Commons Library classes it as a city.
The charger is in the installed price but left out of payback: charging savings depend on your mileage and tariff, which the design call models properly.
Your real roof and usage, worked through on a free 30-minute video call. Use the full form or leave three details below.
Price this for your roof
Three details. We call or text within one working day to book your free 30-minute design call, on video or by phone if you prefer.
The figures use PVGIS for the centre of Swansea (51.63512, -3.9528), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
Connecting solar to the Swansea network
The distribution network operator (DNO) for Swansea is National Grid Electricity Distribution (NGED), which runs the South Wales licence area.
For a typical home the paperwork is light: a system of up to 3.68kW per phase goes through G98, which means NGED is notified within 28 days of switch-on rather than asked beforehand.
A bigger inverter or battery output needs a G99 application in advance. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late.
Sources: NESO DNO licence areas (3 May 2024); NGED, guaranteed standards of performance table, checked 25 September 2026. G98 vs G99, explained.
Beyond the panels: heating and car charging in Swansea
A heat pump in Swansea
Solar and a heat pump pull in opposite directions through the year: Swansea's roofs make 920 kWh from November to February on a 12-panel system, and 3,220 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
In Wales, the Boiler Upgrade Scheme pays £7,500 towards an air source or ground source heat pump and £2,500 towards an air-to-air one, with £1,500 more until March 2027 for homes heated by oil or LPG with no mains gas (gov.uk, checked 28 September 2026).
Charging an EV in Swansea
A 12-panel roof in Swansea makes about 850 kWh in May. A typical home uses around 70 kWh of that in daylight (the calculator's typical-use settings), which leaves most of the month's output for an EV or for export.
If you rent, or own a flat, and have private off-street parking, the government chargepoint grant covers 75% of the cost, capped at £500 a socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above prices a 7.4kW smart charger from £1,100 installed.
The packages, priced before anyone visits
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Swansea
Guidance is nationwide, so the benchmarks hold in Swansea: repair costs, service scope, and when the inverter is the real fault.
Solar in Swansea: your questions answered
What could a roof in Swansea generate?
PVGIS puts a roof in Swansea at 1,023 kWh per kWp a year, 2.80 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,510 kWh a year, most of it between April and September.
What would 12 solar panels cost in Swansea?
£6,360 for 12 panels (6.36 kWp), the same as in every other place we cover, because solar is priced at £1,000 per kWp installed rather than by area. A battery adds its own installed price on top. Where Swansea differs is output: about 6,510 kWh a year from that system.
Do I need permission from the DNO for solar in Swansea?
Usually not in advance. NGED, the network operator for Swansea, only needs a G98 notification within 28 days of commissioning for systems up to 3.68kW per phase. Bigger inverter or battery outputs need G99 approval first. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late. "See our DNO explainer.
How much would export pay on a system in Swansea?
It is exported. With typical use and no battery, about 5,570 kWh of the 6,510 kWh a 12-panel system makes in Swansea goes to the grid, around £668 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Do solar panels work in winter in Swansea?
Yes, at a lower level. PVGIS gives Swansea 22.2 kWh per kWp in December and 30.2 in January, so a 12-panel system makes about 140 kWh and 190 kWh in those months, against 850 kWh in May. Winter output mostly covers daytime use rather than exporting.
How Swansea compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Swansea.
| Town | kWh per kWp a year | vs Swansea |
|---|---|---|
| Swansea | 1,023 | this town |
| Gowerton | 1,063 | +40 kWh |
| Gorseinon | 1,040 | +17 kWh |
| Clydach | 981 | −42 kWh |
| Baglan | 1,027 | +4 kWh |
| Neath | 996 | −27 kWh |
| Port Talbot | 1,026 | +3 kWh |
PVGIS v5.2 for each town centroid, identical assumptions throughout. A few kWh either way is weather-year noise; a spread beyond about 30 kWh per kWp is real geography.
Also for Swansea: Solar panels in Swansea from OVO Solar & Battery
See a number before you speak to anyone
Answer a few questions about your roof and usage and see an instant solar and battery estimate. No email needed to see the result.
Guides worth reading before your call
Sourced, dated and written by us. The same ground we cover on your free call.
Why solar panels stop working, and how to work out which one it is
There is an order to this, and it starts at the inverter display rather than the roof.
Read the guide →Inside a home battery: capacity, power and losses
Usable capacity, kW output, round trip losses and chemistry, in plain terms.
Read the guide →How time of use charging windows actually work
How a cheap overnight window is metered and billed, and what a battery does inside it.
Read the guide →Which homes suit a heat pump, and which need work first
The trial data says no property type is unsuitable. Design quality decides the outcome.
Read the guide →The price cap explained, and what it does to solar payback
The cap limits unit rates, not bills. That changes what solar payback means.
Read the guide →What MCS certification actually is, and why your export payments depend on it
The badge that decides whether your solar earns export payments. It cannot be added later.
Read the guide →Get my free quote
Takes about two minutes. We call or text within one working day to book your free 30-minute video design call at a time that suits you. We design it around your roof and your numbers, and our MCS-certified, fully insured installation teams install it.