Glamorgan
Solar panels in Treorchy, with the numbers shown.
About 5,880 kWh a year from 12 panels in Treorchy, £6,360 installed, with your system designed on a free 30-minute video call.
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What a roof in Treorchy can generate
From 25.1 kWh per kWp in December to 121.7 in May: a roof in Treorchy makes 4.8 times as much in its best month as in its darkest, and 925 kWh per kWp across the year.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 28.9 |
| February | 47 |
| March | 83.2 |
| April | 113 |
| May | 122 |
| June | 117 |
| July | 116 |
| August | 101 |
| September | 87.8 |
| October | 55 |
| November | 37.7 |
| December | 25.1 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 925 kWh per kWp in Treorchy against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Treorchy level with it.
How Treorchy compares
Small towns rarely get published solar figures, so here are the numbers for Treorchy. It is one of 32 Glamorgan towns we track, and it ranks 30th of 32 for solar yield, a town of 7,621 people in the House of Commons Library settlement data. PVGIS gives its roofs 925 kWh per kWp a year, 2.53 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £841 of year one benefit, £247 of it from your own generation and £594 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 Treorchy's own yield.
Treorchy sits within Rhondda Cynon Taf, its local planning authority, and the House of Commons Library classes it as a 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.
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.
Generation is modelled from PVGIS satellite data for Treorchy's own coordinates (51.65965, -3.51125), using the same 26.32p/kWh import value and £1,000 per kWp installed pricing as every Clearline estimate; the methodology is on our help page.
Connecting solar to the Treorchy network
Treorchy sits in National Grid Electricity Distribution's South Wales licence area, so NGED is the network operator (DNO) any solar panels or battery here are registered with.
Below 3.68kW per phase of inverter and battery output, the G98 route applies: the installation is notified to NGED within 28 days of commissioning, with no prior approval.
Anything bigger is a G99 case and is applied for first. 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 Treorchy
A heat pump in Treorchy
Solar and a heat pump pull in opposite directions through the year: Treorchy's roofs make 880 kWh from November to February on a 12-panel system, and 2,900 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
Grant support in Wales comes from the Boiler Upgrade Scheme: £7,500 for an air source or ground source heat pump, £2,500 for air-to-air, and an extra £1,500 until March 2027 where the home is heated by oil or LPG off the gas grid (gov.uk, checked 28 September 2026).
Charging an EV in Treorchy
From April to September, 70% of a Treorchy roof's yearly output arrives, peaking at about 770 kWh in May on 12 panels. A car parked at home in daylight can soak up what the house, at around 70 kWh of daytime use that month, cannot.
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 Treorchy
Guidance is nationwide, so the benchmarks hold in Treorchy: repair costs, service scope, and when the inverter is the real fault.
Common questions about solar in Treorchy
What could a roof in Treorchy generate?
PVGIS puts a roof in Treorchy at 925 kWh per kWp a year, 2.53 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 5,880 kWh a year, most of it between April and September.
What would 12 solar panels cost in Treorchy?
£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 Treorchy differs is output: about 5,880 kWh a year from that system.
Do I need permission from the DNO for solar in Treorchy?
Usually not in advance. NGED, the network operator for Treorchy, 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 Treorchy?
It is exported. With typical use and no battery, about 4,946 kWh of the 5,880 kWh a 12-panel system makes in Treorchy goes to the grid, around £594 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 Treorchy?
Yes, at a lower level. PVGIS gives Treorchy 25.1 kWh per kWp in December and 28.9 in January, so a 12-panel system makes about 160 kWh and 180 kWh in those months, against 770 kWh in May. Winter output mostly covers daytime use rather than exporting.
How Treorchy compares with its neighbours
Same satellite dataset, same assumptions, so the differences are real geography rather than modelling noise.
| Town | kWh per kWp a year | vs Treorchy |
|---|---|---|
| Treorchy | 925 | this town |
| Rhondda | 882 | −43 kWh |
| Tonypandy | 956 | +31 kWh |
| Aberdare | 940 | +15 kWh |
| Porth | 961 | +36 kWh |
| Mountain Ash | 948 | +23 kWh |
| Tonyrefail | 991 | +66 kWh |
Same PVGIS v5.2 query for every town. Small differences are within year-to-year weather; more than about 30 kWh per kWp apart is geography.
Also for Treorchy: Solar panels in Treorchy from OVO Solar & Battery
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Further reading for Treorchy
Sourced, dated and written by us. The same ground we cover on your free call.
How do solar panels work? The full explanation, from photon to plug socket
Light into silicon, DC into AC, AC into your bill. The whole chain, explained.
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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 →What the Smart Export Guarantee actually is
The scheme obliges suppliers to pay above zero, and leaves the rate to them.
Read the guide →G98 or G99: which one applies, what the application involves, and how long it takes
The G98 line sits at 3.68kW per phase. Above it, your network operator has to say yes first.
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.