Hertfordshire, England
Solar panels across Hertfordshire, designed on a free call.
A 12-panel roof in Hertfordshire makes about 6,480 kWh a year and costs £6,360 installed; a free 30-minute video call sizes it to yours.
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- Free 30-minute video design call
- Priced before anyone visits
- Installed by our MCS-certified, fully insured teams
Sunlight in Hertfordshire, in numbers
PVGIS puts Hertfordshire at 1,019 kWh per kWp a year, 10% above the mean of our 85 county estimates. 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 | 38.4 |
| February | 52.5 |
| March | 88.2 |
| April | 114 |
| May | 122 |
| June | 122 |
| July | 125 |
| August | 112 |
| September | 96.7 |
| October | 65.8 |
| November | 46.4 |
| December | 35.6 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
For scale: 1,019 kWh per kWp in Hertfordshire against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Hertfordshire 10% above it.
How Hertfordshire compares
Hertfordshire ranks 16th 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 5,544 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 Hertfordshire'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 Hertfordshire (51.8294, -0.2183), 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.
The network operator for Hertfordshire
The centre of Hertfordshire sits in UK Power Networks' East England licence area on NESO's boundary map, as does every town we cover there, so UK Power Networks is the network operator (DNO) a system here is registered with.
What decides the paperwork is the inverter and battery output, not the number of panels. Up to 3.68kW per phase, a system follows G98: UK Power Networks is notified within 28 days of commissioning and nothing has to be approved first.
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.
Heat pumps and EV charging in Hertfordshire
A heat pump in Hertfordshire
Heating demand peaks when solar is weakest. In Hertfordshire, a 12-panel system makes about 230 kWh in December and 240 kWh in January, a fraction of its 800 kWh in July, which is why a heat pump here is costed on its tariff first.
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 Hertfordshire
Summer is where a car earns its place. In July, 12 panels in Hertfordshire make about 800 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 in Hertfordshire: your questions answered
How much electricity do solar panels make in Hertfordshire?
About 6,480 kWh a year from 12 panels (6.36 kWp), on PVGIS satellite data for Hertfordshire: 1,019 kWh per kWp, or 2.79 peak sun hours a day on average. July is the strongest month, at about 800 kWh.
What does a typical solar system cost in Hertfordshire?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in Hertfordshire, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,480 kWh a year. The final figure comes from your roof on the design call.
Which DNO covers Hertfordshire, and what does it need from me?
UK Power Networks covers Hertfordshire. A home system of up to 3.68kW per phase is notified to UK Power Networks within 28 days of commissioning under G98, and nothing waits on approval. Larger outputs need a G99 application before work starts. 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.
What happens to the solar I do not use in Hertfordshire?
Around £665 a year at 12p per kWh, for the roughly 5,544 kWh a 12-panel system in Hertfordshire exports with typical use. Rates vary by supplier and some need their own tariff; the export rates table is dated and sourced.
How much solar does Hertfordshire get in December?
December is the low point: about 230 kWh from a 12-panel system in Hertfordshire, on PVGIS data, rising to 800 kWh in July. From November to February the same system makes about 1,100 kWh in total, which is why a battery charged off-peak does more of the work in winter.
Towns we cover in Hertfordshire
27 Hertfordshire towns have their own page, each with PVGIS figures, a network operator and a monthly curve for its own location.
Nearby in England
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Reading for Hertfordshire homeowners
The same guidance we would talk through on your call, written down and sourced.
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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.