Monmouthshire
Solar panels in Chepstow, priced before anyone visits.
Twelve panels (6.36 kWp) here make about 6,560 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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How much a Chepstow roof makes, month by month
PVGIS puts Chepstow at 1,032 kWh per kWp a year, 3% above our Monmouthshire county estimate. 69% of it arrives between April and September, peaking in July.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 37.7 |
| February | 53.8 |
| March | 87.6 |
| April | 118 |
| May | 127 |
| June | 127 |
| July | 129 |
| August | 111 |
| September | 97 |
| October | 64.8 |
| November | 43 |
| December | 34.6 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Our GB average is 925 kWh per kWp a year, the mean of the 85 county PVGIS estimates we publish; at 1,032, Chepstow is 12% above it.
How Chepstow compares
Small towns rarely get published solar figures, so here are the numbers for Chepstow. It is one of 16 Monmouthshire towns we track, and it ranks 1st of 16 for solar yield, a town of 12,561 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,032 kWh per kWp a year, 2.83 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £922 of year one benefit, £247 of it from your own generation and £675 from export at 12p.
These are starting numbers, not a quote. The calculator below opens on Chepstow's own PVGIS figure; change the panels, the battery or the export rate and it reruns. The design call replaces every assumption with your roof and your bills.
Any planning application in Chepstow sits with Monmouthshire, 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.
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 Chepstow (51.6335, -2.67852), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
The network operator for Chepstow
National Grid Electricity Distribution (NGED) owns and runs the local electricity network in Chepstow, 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.
Larger systems go through G99 instead, applied for before installation. On timing: 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.
Adding a heat pump or an EV charger in Chepstow
A heat pump in Chepstow
In December, the darkest month here, 12 panels in Chepstow make about 220 kWh. That is when a heat pump runs hardest, so its running cost in Chepstow comes down to the tariff and the flow temperature rather than the roof.
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 Chepstow
Summer is where a car earns its place. In July, 12 panels in Chepstow make about 820 kWh, against roughly 70 kWh a typical home uses in daylight that month on our calculator's typical-use settings, so there is surplus a smart charger can put into the car instead of exporting it.
Renters and flat owners with private off-street parking can get 75% off a chargepoint and its installation, up to £500 per socket, until 31 March 2027 (gov.uk, checked 28 September 2026). The calculator above adds a 7.4kW smart charger from £1,100 installed.
What the named kit costs, installed
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Chepstow
If a system in Chepstow is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Common questions about solar in Chepstow
How much energy would 12 solar panels make in Chepstow?
Chepstow averages 2.83 peak sun hours a day, which PVGIS turns into 1,032 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,560 kWh, 69% of it between April and September.
What does a typical solar system cost in Chepstow?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Chepstow, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,560 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in Chepstow, and do I need a G99 application?
The operator is National Grid Electricity Distribution (NGED). Most home systems use the G98 route, a notification within 28 days of switch-on for up to 3.68kW per phase, so nothing waits on the network. Above that, G99 applies and has to be granted first. NGED's guaranteed standards give 45 working days for a low voltage generation quotation, with £80 paid for each working day late. Your design call checks which route yours needs.
What happens to the solar I do not use in Chepstow?
Around £675 a year at 12p per kWh, for the roughly 5,627 kWh a 12-panel system in Chepstow exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How does solar perform in Chepstow in the winter months?
December is the weakest month in Chepstow: about 220 kWh from 12 panels, against 820 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Chepstow compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as Chepstow.
| Town | kWh per kWp a year | vs Chepstow |
|---|---|---|
| Chepstow | 1,032 | this town |
| Caldicot | 1,023 | −9 kWh |
| Thornbury | 1,024 | −8 kWh |
| Patchway | 1,013 | −19 kWh |
| Bradley Stoke | 1,009 | −23 kWh |
| Lydney | 1,024 | −8 kWh |
| Filton | 1,014 | −18 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 Chepstow: Solar panels in Chepstow 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.
Do solar panels need direct sunlight? Not really, and here is why
No. Solar cells respond to light hitting them, not to a clear line of sight to the sun.
Read the guide →GivEnergy in administration: what owners should do now
The sourced timeline, the warranty position, and the owner's checklist for this month.
Read the guide →Charging an EV from your own solar
Every surplus kWh is 3.6 to 5 miles. Whether that beats a 7p overnight rate is arithmetic.
Read the guide →Are heat pumps worth it? The real 2026 numbers
Electricity costs 3.3x gas per kWh. A heat pump is about 3x as efficient. The numbers nearly cancel out.
Read the guide →EV tariffs compared: the cheapest overnight windows
Overnight rates of 6.99p to 9p against a 26.32p capped average, compared.
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.