Cornwall, England
Solar and batteries in Cornwall, sized to your roof.
Twelve panels (6.36 kWp) here make about 6,470 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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What a roof in Cornwall can generate
Cornwall's best month is May, at 124.6 kWh per kWp; December manages 34.3. Over the year that comes to 1,017 kWh per kWp, 10% above the mean of our 85 county estimates.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 38.1 |
| February | 56.5 |
| March | 88.5 |
| April | 118 |
| May | 125 |
| June | 123 |
| July | 120 |
| August | 110 |
| September | 95.2 |
| October | 63.6 |
| November | 44.6 |
| December | 34.3 |
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 1,017, Cornwall is 10% above it.
How Cornwall compares
Cornwall ranks 18th of the 85 counties we track for solar yield, which puts export income near the top of the country. On the 12p scenario a 12 panel system here sends about 5,531 kWh to the grid a year on top of the £247 it saves you directly, so oversizing the array is usually the right call.
Treat these as calibration rather than a quote. The calculator below opens on Cornwall's own PVGIS yield and prices a 12 panel system at £6,360 installed before any battery; your free design call reworks every number for your roof.
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 from PVGIS v5.2 (European Commission JRC, SARAH3), retrieved August 2026 for a representative point in Cornwall (50.403, -4.829), assuming 1 kWp, 14% system loss, 35 degree pitch, due south. Import valued at 26.32p/kWh (Ofgem price cap average, Oct to Dec 2026); off-peak charging at 8.5p/kWh where used (a supplier's published off-peak rate, checked September 2026); export at the scenario you pick, from the dated tariff table. Prices are installed pricing, August 2026, standard installations; 530W LONGi panels at £1,000 per kWp. Estimates for illustration, not a quote: your free design call prices your actual roof.
Connecting solar to the Cornwall network
National Grid Electricity Distribution (NGED) is the distribution network operator (DNO) for Cornwall, running its South West England licence area.
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.
Heat pumps and EV charging in Cornwall
A heat pump in Cornwall
Solar and a heat pump pull in opposite directions through the year: Cornwall's roofs make 1,100 kWh from November to February on a 12-panel system, and 3,040 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
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 Cornwall
From April to September, 68% of a Cornwall roof's yearly output arrives, peaking at about 790 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 across Cornwall
Every system is designed around your roof on the free call before anything is fitted.
What else is true of Cornwall
Cornwall Council's Building Stone Guide describes a building stock that draws heavily on local granite and slate, giving Cornish buildings their character, including scantle slating, a still-practised technique of slate hung on timber pegs over lime mortar, graded larger at the eaves to smaller at the ridge, that can last more than a century. With 288,262 dwellings recorded as of April 2022 and 88.6% privately owned or rented, most of that stone-and-slate stock sits in private hands, so panel counts depend on the roof's own pitch and condition.
Cornwall sits in National Grid Electricity Distribution territory, on its South West licence; its own published Guaranteed Standard is 45 working days for a generation quotation, with a complete application acknowledged within 10 working days. Cornwall Council is the sole planning authority for the whole county, a unitary structure in place since 2009, unlike the district split in Kent or Hampshire; its own guidance confirms ground-mounted solar on Cornwall National Landscape land, covering around a third of the county, can need approval, while roof-mounted domestic solar stays unaffected.
Cornwall Council was one of the first UK councils to declare a climate emergency, doing so on 22 January 2019, though its cabinet has since reset the countywide net zero target from 2030 to 2045, aligned with national UK targets, while the council's own operations still aim for a 70% cut by 2030. Cornwall Housing has separately fitted more than 2MW of solar panels on tenants' homes, part-funded by the council and national grant programmes, giving residents free electricity and lower bills.
Sources: cornwall.gov.uk · cornwall.gov.uk
Cornwall solar questions
What could a roof in Cornwall generate?
PVGIS puts a roof in Cornwall at 1,017 kWh per kWp a year, 2.79 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 6,470 kWh a year, most of it between April and September.
How much are solar panels in Cornwall?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Cornwall before a battery. What Cornwall changes is the return, about 6,470 kWh a year from that system, and your design call prices your actual roof.
Do I need permission from the DNO for solar in Cornwall?
Usually not in advance. NGED, the network operator for Cornwall, 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 can I earn from exporting solar in Cornwall?
With typical use and no battery, a 12-panel system in Cornwall exports about 5,531 kWh a year. At 12p per kWh that is roughly £664; a supplier paying more, or a battery that keeps more for the evening, changes the figure. See the export rates table.
Do solar panels work in winter in Cornwall?
Yes, at a lower level. PVGIS gives Cornwall 34.3 kWh per kWp in December and 38.1 in January, so a 12-panel system makes about 220 kWh and 240 kWh in those months, against 790 kWh in May. Winter output mostly covers daytime use rather than exporting.
Nearby in England
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Reading for Cornwall homeowners
The same guidance we would talk through on your call, written down and sourced.
The 0% VAT deadline: what ends on 31 March 2027, and what it costs to miss it
The install deadline is still 31 March 2027. Electricity's 0% VAT was extended to the end of June.
Read the guide →What a battery gateway actually does
Without a gateway your system shuts down when the grid does. Here is what the box actually does.
Read the guide →What an EV charger installation actually involves
Main fuse, DNO notification, load balancing and the paperwork. What really happens.
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 →Which tariffs are actually built for battery charging
A battery buys cheap and uses dear. The tariff decides how much that is worth.
Read the guide →How to check an MCS certificate is genuine, before the deposit leaves your account
A logo proves nothing. Certification is business specific, technology specific and checkable.
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.