Hertfordshire
Solar panels in London Colney, designed on a free call.
Twelve panels (6.36 kWp) here make about 6,500 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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- Free 30-minute video design call
- Priced before anyone visits
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Sunlight in London Colney, in numbers
London Colney's best month is July, at 124.9 kWh per kWp; December manages 36.1. Over the year that comes to 1,022 kWh per kWp, level with our Hertfordshire county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.1 |
| February | 52.5 |
| March | 88.3 |
| April | 115 |
| May | 122 |
| June | 123 |
| July | 125 |
| August | 112 |
| September | 96.7 |
| October | 65.8 |
| November | 46.6 |
| December | 36.1 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 1,022 kWh per kWp in London Colney against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts London Colney 10% above it.
How London Colney compares
Small towns rarely get published solar figures, so here are the numbers for London Colney. It is one of 27 Hertfordshire towns we track, and it ranks joint 9th of 27 for solar yield, a town of 8,547 people in the House of Commons Library settlement data. PVGIS gives its roofs 1,022 kWh per kWp a year, 2.80 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £915 of year one benefit, £247 of it from your own generation and £668 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 London Colney's own yield.
Planning applications here go through St Albans; nationally, the House of Commons Library classes London Colney 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.
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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.
Generation is modelled from PVGIS satellite data for London Colney's own coordinates (51.72168, -0.29688), 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.
UK Power Networks and your London Colney connection
UK Power Networks owns and runs the local electricity network in London Colney, as part of its East England licence area.
For a typical home the paperwork is light: a system of up to 3.68kW per phase goes through G98, which means UK Power Networks is notified within 28 days of switch-on rather than asked beforehand.
Above that, G99 means applying before the work is booked. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator.
Sources: NESO DNO licence areas (3 May 2024); Ofgem, Distributed Generation Standards Direction guidance, checked 27 September 2026. G98 vs G99, explained.
Beyond the panels: heating and car charging in London Colney
A heat pump in London Colney
Heating demand peaks when solar is weakest. In London Colney, a 12-panel system makes about 230 kWh in December and 250 kWh in January, a fraction of its 790 kWh in July, 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 London Colney
London Colney's July output, about 790 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.
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 London Colney
If a system in London Colney is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Solar in London Colney: your questions answered
How much energy would 12 solar panels make in London Colney?
London Colney averages 2.80 peak sun hours a day, which PVGIS turns into 1,022 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,500 kWh, 68% of it between April and September.
Is solar more expensive in London Colney?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in London Colney, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 6,500 kWh a year here, which is what drives payback.
Who is the network operator in London Colney, and do I need a G99 application?
The operator is UK Power Networks. 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. Ofgem's guaranteed standard for a low voltage generation connection quotation is 45 working days, with £80 paid for each working day late, and it binds UK Power Networks as it does every network operator. Your design call checks which route yours needs.
What could I earn from exporting in London Colney?
On the 12p export scenario, a 12-panel system in London Colney sends about 5,563 kWh a year to the grid, worth around £668. The export rates table compares what each supplier pays.
How does solar perform in London Colney in the winter months?
December is the weakest month in London Colney: about 230 kWh from 12 panels, against 790 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How London Colney compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as London Colney.
| Town | kWh per kWp a year | vs London Colney |
|---|---|---|
| London Colney | 1,022 | this town |
| St Albans | 1,023 | +1 kWh |
| Radlett | 1,018 | −4 kWh |
| Hatfield | 1,022 | level |
| Borehamwood | 1,015 | −7 kWh |
| Potters Bar | 1,026 | +4 kWh |
| Bushey | 1,024 | +2 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 London Colney: Solar panels in London Colney from OVO Solar & Battery
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Guides worth reading before your call
Sourced, dated and written by us. The same ground we cover on your free call.
How long does a solar inverter last, and when does replacing it make sense?
The one component you should expect to replace, and the decision tree when it goes.
Read the guide →Whole home backup or partial backup? The runtime arithmetic
Whole home backup sounds obvious until you do the runtime maths. Here is how to choose the right tier.
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 →What the Smart Export Guarantee actually is
The scheme obliges suppliers to pay above zero, and leaves the rate to them.
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.