Hertfordshire
Solar panels in Watford, priced before anyone visits.
Twelve panels (6.36 kWp) here make about 6,440 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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How much a Watford roof makes, month by month
PVGIS puts Watford at 1,013 kWh per kWp a year, 1% below our Hertfordshire county estimate. 68% of it arrives between April and September, peaking in July.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39.1 |
| February | 53.8 |
| March | 88 |
| April | 113 |
| May | 121 |
| June | 122 |
| July | 124 |
| August | 110 |
| September | 95.3 |
| October | 65.4 |
| November | 45.8 |
| December | 36.7 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 1,013 kWh per kWp in Watford against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Watford 10% above it.
How Watford compares
Watford is one of 27 Hertfordshire towns we track, and it ranks 23rd of 27 for solar yield. The House of Commons Library settlement data classes it as a large town of 137,800 people. At 1,013 kWh per kWp a year, a typical 12 panel system here pays for itself in around 7.0 years on the 12p scenario: £907 of year one benefit against £6,360 installed, £247 of that benefit from cutting 26.32p imports with your own generation.
These are starting numbers, not a quote. The calculator below opens on Watford'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.
Watford is its own local planning authority area, and its House of Commons Library settlement class is large 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 Watford (51.66426, -0.40027), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
The network operator for Watford
Watford sits in UK Power Networks' East England licence area, so UK Power Networks 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 UK Power Networks within 28 days of commissioning, with no prior approval.
Larger systems go through G99 instead, applied for before installation. On timing: 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.
Adding a heat pump or an EV charger in Watford
A heat pump in Watford
In December, the darkest month here, 12 panels in Watford make about 230 kWh. That is when a heat pump runs hardest, so its running cost in Watford comes down to the tariff and the flow temperature rather than the roof.
In England, 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 Watford
Summer is where a car earns its place. In July, 12 panels in Watford make about 790 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 Watford
If a system in Watford is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Common questions about solar in Watford
How much energy would 12 solar panels make in Watford?
Watford averages 2.78 peak sun hours a day, which PVGIS turns into 1,013 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,440 kWh, 68% of it between April and September.
What does a typical solar system cost in Watford?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Watford, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,440 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in Watford, 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 happens to the solar I do not use in Watford?
Around £661 a year at 12p per kWh, for the roughly 5,506 kWh a 12-panel system in Watford 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 Watford in the winter months?
December is the weakest month in Watford: 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 Watford 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 Watford |
|---|---|---|
| Watford | 1,013 | this town |
| Bushey | 1,024 | +11 kWh |
| Rickmansworth | 1,019 | +6 kWh |
| Abbots Langley and Kings Langley | 1,016 | +3 kWh |
| Radlett | 1,018 | +5 kWh |
| Chorleywood | 1,011 | −2 kWh |
| Borehamwood | 1,015 | +2 kWh |
Each row is a PVGIS v5.2 run at that town's centre with the same settings. Treat gaps of a few kWh as noise and gaps over about 30 kWh per kWp as real differences in sunshine.
Also for Watford: Solar panels in Watford from OVO Solar & Battery
Also near Watford
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Further reading for Watford
Sourced, dated and written by us. The same ground we cover on your free call.
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Read the guide →Does a standalone battery actually pay back?
No panels means one job: buy cheap, use later. The tariff decides whether it pays.
Read the guide →The main home EV chargers, compared on what actually differs
Eight popular UK home chargers on cable, connectivity, warranty and tariff integration.
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.