Middlesex
Solar panels in City of Westminster, priced before anyone visits.
Twelve panels (6.36 kWp) here make about 6,530 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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Sunlight in City of Westminster, in numbers
PVGIS puts City of Westminster at 1,026 kWh per kWp a year, level with our Middlesex county estimate. 67% of it arrives between April and September, peaking in July.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 40.4 |
| February | 53.1 |
| March | 88.9 |
| April | 115 |
| May | 122 |
| June | 123 |
| July | 125 |
| August | 110 |
| September | 96.6 |
| October | 67.8 |
| November | 47.7 |
| December | 37.6 |
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 1,026, City of Westminster is 11% above it.
How City of Westminster compares
City of Westminster is one of 23 Middlesex towns we track, and it ranks joint 5th of 23 for solar yield. The House of Commons Library settlement classification puts it in the core city class, with a population of 209,075, which makes it one of the largest places we publish figures for. Scale changes nothing about the physics: PVGIS gives a roof here 1,026 kWh per kWp a year, 2.81 peak sun hours a day averaged across the seasons, and on the 12p scenario about £247 of the year one benefit comes from solar you use yourself, with export income adding £671.
These are starting numbers, not a quote. The calculator below opens on City of Westminster'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.
Any planning application in City of Westminster sits with Westminster, and its official House of Commons Library settlement class is core city.
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 is modelled from PVGIS satellite data for City of Westminster's own coordinates (51.51367, -0.16069), 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 City of Westminster connection
On NESO's licence-area map, City of Westminster is in London, which UK Power Networks operates. That makes UK Power Networks the network operator for any system fitted here.
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 City of Westminster
A heat pump in City of Westminster
Heating demand peaks when solar is weakest. In City of Westminster, a 12-panel system makes about 240 kWh in December and 260 kWh in January, a fraction of its 800 kWh in July, which is why a heat pump here is costed on its tariff first.
Grant support in England comes from the Boiler Upgrade Scheme: £7,500 for an air source or ground source heat pump, £2,500 for air-to-air, and an extra £1,500 until March 2027 where the home is heated by oil or LPG off the gas grid (gov.uk, checked 28 September 2026).
Charging an EV in City of Westminster
Summer is where a car earns its place. In July, 12 panels in City of Westminster 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.
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 City of Westminster
If a system in City of Westminster is underperforming, start with the guides below: repair benchmarks, service scope, and the inverter question.
City of Westminster solar questions
How much energy would 12 solar panels make in City of Westminster?
City of Westminster averages 2.81 peak sun hours a day, which PVGIS turns into 1,026 kWh per kWp a year. On a 12-panel, 6.36 kWp roof that is about 6,530 kWh, 67% of it between April and September.
What does a typical solar system cost in City of Westminster?
Solar is priced at £1,000 per kWp installed wherever you live, so a 12-panel, 6.36 kWp system costs £6,360 in City of Westminster, exactly as it would anywhere else, before any battery. Location changes what the system makes, not what it costs: here that is about 6,530 kWh a year. The final figure comes from your roof on the design call.
Who is the network operator in City of Westminster, 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 City of Westminster?
Around £671 a year at 12p per kWh, for the roughly 5,589 kWh a 12-panel system in City of Westminster 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 City of Westminster in the winter months?
December is the weakest month in City of Westminster: 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 City of Westminster compares with its neighbours
The six closest towns we publish, run through the identical PVGIS query as City of Westminster.
| Town | kWh per kWp a year | vs City of Westminster |
|---|---|---|
| City of Westminster | 1,026 | this town |
| Kensington and Chelsea | 1,026 | level |
| Camden | 1,026 | level |
| Hammersmith and Fulham | 1,031 | +5 kWh |
| City and County of the City of London | 1,026 | level |
| Islington | 1,026 | level |
| Wandsworth | 1,030 | +4 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 City of Westminster: Solar panels in City of Westminster 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.
Solar panel types, and the four numbers that actually matter
TOPCon, HJT and back contact decoded, plus the four numbers worth comparing.
Read the guide →Which battery size band does your home fall into?
Where UK homes actually land, why oversizing costs you, and what shifts the band.
Read the guide →How time of use charging windows actually work
How a cheap overnight window is metered and billed, and what a battery does inside it.
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 →EV tariffs compared: the cheapest overnight windows
Overnight rates of 6.99p to 9p against a 26.32p capped average, compared.
Read the guide →HIES explained: what the badge actually protects, and when
What HIES protects: deposits up to 25 percent capped at 5,000 pounds, and your workmanship guarantee.
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.