Essex
Solar panels in Harlow, designed on a free call.
A 12-panel roof in Harlow makes about 6,560 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
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How much a Harlow roof makes, month by month
Harlow's best month is July, at 126.1 kWh per kWp; December manages 37. Over the year that comes to 1,032 kWh per kWp, 3% below our Essex county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 39 |
| February | 53.4 |
| March | 89.2 |
| April | 116 |
| May | 123 |
| June | 124 |
| July | 126 |
| August | 113 |
| September | 98.1 |
| October | 67.7 |
| November | 46.7 |
| December | 37 |
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 1,032, Harlow is 12% above it.
How Harlow compares
Harlow is one of 46 Essex towns we track, and it ranks joint 38th of 46 for solar yield. The House of Commons Library settlement data classes it as a large town of 98,155 people. At 1,032 kWh per kWp a year, a typical 12 panel system here pays for itself in around 6.9 years on the 12p scenario: £922 of year one benefit against £6,360 installed, £247 of that benefit from cutting 26.32p imports with your own generation.
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 Harlow's own yield.
Harlow 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.
Modelled for Harlow at 51.76778, 0.10833 on PVGIS data, with imports valued at 26.32p/kWh and solar at £1,000 per kWp installed. Sources and assumptions: help page.
UK Power Networks and your Harlow connection
Harlow is served by UK Power Networks: the town's centre falls inside its East England licence area on NESO's boundary map.
Most home systems stay within 3.68kW per phase of inverter output, which puts them on G98, a notification to UK Power Networks within 28 days of switch-on. Panel count does not decide it; the inverter and any battery do.
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 Harlow
A heat pump in Harlow
In December, the darkest month here, 12 panels in Harlow make about 240 kWh. That is when a heat pump runs hardest, so its running cost in Harlow 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 Harlow
Harlow's July output, about 800 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.
Installed prices, the same in every town
Every system is designed around your roof on the free call before anything is fitted.
Solar panel servicing and repair in Harlow
If a system in Harlow is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
Common questions about solar in Harlow
How much energy would 12 solar panels make in Harlow?
Harlow averages 2.83 peak sun hours a day, which PVGIS turns into 1,032 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,560 kWh, 68% of it between April and September.
Is solar more expensive in Harlow?
Prices on this site are the same everywhere: £1,000 per kWp installed, which puts a 12-panel system at £6,360 in Harlow, and a Duracell Dura16 installed with solar at £4,450 on top. The local part is generation, about 6,560 kWh a year here, which is what drives payback.
Who is the network operator in Harlow, 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 Harlow?
On the 12p export scenario, a 12-panel system in Harlow sends about 5,627 kWh a year to the grid, worth around £675. The export rates table compares what each supplier pays.
How does solar perform in Harlow in the winter months?
December is the weakest month in Harlow: about 240 kWh from 12 panels, against 800 kWh in July. The panels still generate on bright winter days; they just cover a smaller share of what the house uses.
How Harlow compares with its neighbours
How the towns nearest Harlow compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Harlow |
|---|---|---|
| Harlow | 1,032 | this town |
| Sawbridgeworth | 1,034 | +2 kWh |
| Epping | 1,030 | −2 kWh |
| Hoddesdon | 1,018 | −14 kWh |
| Ware | 1,018 | −14 kWh |
| Waltham Abbey | 1,016 | −16 kWh |
| Bishop's Stortford | 1,035 | +3 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 Harlow: Solar panels in Harlow from OVO Solar & Battery
Also near Harlow
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 Harlow homeowners
Sourced, dated and written by us. The same ground we cover on your free call.
What solar actually costs in 2026, and where every pound goes
Around £8,677 average, £1,550 to £1,800 per kW. Where every pound actually goes.
Read the guide →Inside a home battery: capacity, power and losses
Usable capacity, kW output, round trip losses and chemistry, in plain terms.
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 →What MCS certification actually buys you on a heat pump job
The gate on the £7,500 grant, the design standard behind your running costs, and the noise sign-off.
Read the guide →Why tariff choice moves payback more than kit choice
Identical kit, five times the export income. The tariff decision worked through with August 2026 rates.
Read the guide →What MCS certification actually is, and why your export payments depend on it
The badge that decides whether your solar earns export payments. It cannot be added later.
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.