Glamorgan
Solar panels in Porth, designed on a free call.
A 12-panel roof in Porth makes about 6,110 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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Sunlight in Porth, in numbers
Porth's best month is May, at 123.1 kWh per kWp; December manages 27.8. Over the year that comes to 961 kWh per kWp, 2% above our Glamorgan county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 31.7 |
| February | 49.8 |
| March | 85.9 |
| April | 113 |
| May | 123 |
| June | 119 |
| July | 119 |
| August | 104 |
| September | 89.8 |
| October | 58.7 |
| November | 40 |
| December | 27.8 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Against Great Britain as a whole: Porth makes 961 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Porth is 4% above it.
How Porth compares
Small towns rarely get published solar figures, so here are the numbers for Porth. It is one of 32 Glamorgan towns we track, and it ranks 24th of 32 for solar yield, a town of 13,467 people in the House of Commons Library settlement data. PVGIS gives its roofs 961 kWh per kWp a year, 2.63 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £868 of year one benefit, £247 of it from your own generation and £621 from export at 12p.
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 Porth's own yield.
Any planning application in Porth sits with Rhondda Cynon Taf, and its official House of Commons Library settlement class is small town.
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.
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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.
Modelled for Porth at 51.61303, -3.40817 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
NGED and your Porth connection
National Grid Electricity Distribution (NGED) owns and runs the local electricity network in Porth, as part of its 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.
Above that, G99 means applying before the work is booked. 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 Porth
A heat pump in Porth
Heating demand peaks when solar is weakest. In Porth, a 12-panel system makes about 180 kWh in December and 200 kWh in January, a fraction of its 780 kWh in May, which is why a heat pump here is costed on its tariff first.
The Boiler Upgrade Scheme, open in England and Wales, takes £7,500 off an air source or ground source heat pump, or £2,500 off an air-to-air unit. Homes on oil or LPG with no mains gas get £1,500 more until March 2027 (gov.uk, checked 28 September 2026).
Charging an EV in Porth
Porth's May output, about 780 kWh from 12 panels, is several times the 70 kWh or so a typical home uses in daylight that month on our calculator's settings. Daytime charging turns that surplus into miles.
The calculator above includes a 7.4kW smart charger from £1,100 installed. Renters and flat owners with off-street parking can claim 75% of a chargepoint's cost, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026).
Installed prices, the same in every town
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Porth
The same sourced benchmarks apply in Porth as everywhere we cover: honest repair pricing and what a service should include.
Common questions about solar in Porth
How much electricity do solar panels make in Porth?
About 6,110 kWh a year from 12 panels (6.36 kWp), on PVGIS satellite data for Porth: 961 kWh per kWp, or 2.63 peak sun hours a day on average. May is the strongest month, at about 780 kWh.
Is solar more expensive in Porth?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in Porth, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 6,110 kWh a year here, which is what drives payback.
Which DNO covers Porth, and what does it need from me?
National Grid Electricity Distribution (NGED) covers Porth. A home system of up to 3.68kW per phase is notified to NGED within 28 days of commissioning under G98, and nothing waits on approval. Larger outputs need a G99 application before work starts. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late.
What could I earn from exporting in Porth?
On the 12p export scenario, a 12-panel system in Porth sends about 5,175 kWh a year to the grid, worth around £621. The export rates table compares what each supplier pays.
How much solar does Porth get in December?
December is the low point: about 180 kWh from a 12-panel system in Porth, on PVGIS data, rising to 780 kWh in May. From November to February the same system makes about 950 kWh in total, which is why a battery charged off-peak does more of the work in winter.
How Porth compares with its neighbours
How the towns nearest Porth compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Porth |
|---|---|---|
| Porth | 961 | this town |
| Tonypandy | 956 | −5 kWh |
| Tonyrefail | 991 | +30 kWh |
| Rhondda | 882 | −79 kWh |
| Pontypridd | 997 | +36 kWh |
| Mountain Ash | 948 | −13 kWh |
| Church Village | 1,001 | +40 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 Porth: Solar panels in Porth from OVO Solar & Battery
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Reading for Porth homeowners
Sourced, dated and written by us. The same ground we cover on your free call.
DNO application timescales, network by network: from a G98 notification to a G99 approval
Fit and notify within 28 days, or wait ten working days to 45 for a yes. System size decides which.
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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.