Hertfordshire
Solar panels in Letchworth, sized to your roof.
Twelve panels (6.36 kWp) here make about 6,480 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
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What a roof in Letchworth can generate
Letchworth's best month is July, at 123.6 kWh per kWp; December manages 36.3. Over the year that comes to 1,019 kWh per kWp, level with our Hertfordshire county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 38.7 |
| February | 52.7 |
| March | 88.9 |
| April | 114 |
| May | 122 |
| June | 122 |
| July | 124 |
| August | 111 |
| September | 97.1 |
| October | 66.3 |
| November | 46.7 |
| December | 36.3 |
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 Letchworth against 925, our GB average (the mean of our 85 county PVGIS estimates), which puts Letchworth 10% above it.
How Letchworth compares
Among the places we publish figures for, Letchworth is one of 27 Hertfordshire towns we track, and it ranks joint 12th of 27 for solar yield. It is a medium town in the House of Commons Library classification, with 34,603 residents, and its roofs see 2.79 peak sun hours a day across the year. That drives the standard 12 panel model to 6,481 kWh of generation, of which around 5,544 kWh is exported at 12p for £665 a year, with £247 saved on electricity you would otherwise buy at 26.32p.
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 Letchworth's own yield.
Letchworth sits within North Hertfordshire, its local planning authority, and the House of Commons Library classes it as a medium 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 Letchworth (51.9785, -0.22372), a 26.32p/kWh import price and £1,000 per kWp installed; see the help page for the full method.
Connecting solar to the Letchworth network
Letchworth 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.
Anything bigger is a G99 case and is applied for 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.
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 Letchworth
A heat pump in Letchworth
Solar and a heat pump pull in opposite directions through the year: Letchworth's roofs make 1,110 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 Letchworth
A 12-panel roof in Letchworth makes about 790 kWh in July. A typical home uses around 70 kWh of that in daylight (the calculator's typical-use settings), which leaves most of the month's output for an EV or for export.
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).
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 Letchworth
Guidance is nationwide, so the benchmarks hold in Letchworth: repair costs, service scope, and when the inverter is the real fault.
Solar in Letchworth: your questions answered
What could a roof in Letchworth generate?
PVGIS puts a roof in Letchworth at 1,019 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 6,480 kWh a year, most of it between April and September.
How much are solar panels in Letchworth?
The price does not move by postcode. At £1,000 per kWp installed, 12 panels (6.36 kWp) come to £6,360 in Letchworth before a battery. What Letchworth changes is the return, about 6,480 kWh a year from that system, and your design call prices your actual roof.
Do I need permission from the DNO for solar in Letchworth?
Usually not in advance. UK Power Networks, the network operator for Letchworth, 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. 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. "See our DNO explainer.
How much can I earn from exporting solar in Letchworth?
With typical use and no battery, a 12-panel system in Letchworth exports about 5,544 kWh a year. At 12p per kWh that is roughly £665; 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 Letchworth?
Yes, at a lower level. PVGIS gives Letchworth 36.3 kWh per kWp in December and 38.7 in January, so a 12-panel system makes about 230 kWh and 250 kWh in those months, against 790 kWh in July. Winter output mostly covers daytime use rather than exporting.
How Letchworth compares with its neighbours
How the towns nearest Letchworth compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Letchworth |
|---|---|---|
| Letchworth | 1,019 | this town |
| Baldock | 1,024 | +5 kWh |
| Stotfold | 1,022 | +3 kWh |
| Hitchin | 1,016 | −3 kWh |
| Stevenage | 1,025 | +6 kWh |
| Shefford | 1,025 | +6 kWh |
| Biggleswade | 1,029 | +10 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 Letchworth: Solar panels in Letchworth 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.
Reading for Letchworth homeowners
Sourced, dated and written by us. The same ground we cover on your free call.
Why solar panels stop working, and how to work out which one it is
There is an order to this, and it starts at the inverter display rather than the roof.
Read the guide →GivEnergy in administration: what owners should do now
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Read the guide →How solar aware EV charging actually works
The CT clamp, the surplus tracking and the 1.4kW floor that catches people out.
Read the guide →How an air source heat pump actually works
It moves heat rather than making it. The cycle, the efficiency numbers and the trade-offs.
Read the guide →Will energy prices keep rising, and by how much
The January forecasts jumped fast. What is confirmed, what is guessed, and whether solar is a real hedge.
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.