Renfrewshire
Solar panels in Johnstone, with the numbers shown.
Twelve panels (6.36 kWp) here make about 5,410 kWh a year for £6,360 installed, designed around your roof on a free 30-minute video call.
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What a roof in Johnstone can generate
Johnstone's best month is May, at 119.5 kWh per kWp; December manages 18.1. Over the year that comes to 851 kWh per kWp, level with our Renfrewshire county estimate.
Generation per kWp, month by month
Show the monthly figures
| Month | kWh/kWp |
|---|---|
| January | 20.9 |
| February | 41.1 |
| March | 69.9 |
| April | 105 |
| May | 120 |
| June | 112 |
| July | 112 |
| August | 96.9 |
| September | 73.7 |
| October | 51 |
| November | 31.3 |
| December | 18.1 |
Source: PVGIS v5.2 (European Commission JRC), SARAH3 database, 1 kWp, 14% system loss, 35 degree pitch, due south, checked September 2026.
Against Great Britain as a whole: Johnstone makes 851 kWh per kWp a year, and the mean of our 85 county PVGIS estimates (our GB average) is 925, so Johnstone is 8% below it.
How Johnstone compares
Small towns rarely get published solar figures, so here are the numbers for Johnstone. It is one of 11 Renfrewshire towns we track, and it ranks joint 6th of 11 for solar yield, a town of 16,468 people in the House of Commons Library settlement data. PVGIS gives its roofs 851 kWh per kWp a year, 2.33 peak sun hours a day averaged across the seasons, and the standard 12 panel model turns that into £784 of year one benefit, £247 of it from your own generation and £537 from export at 12p.
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 Johnstone's own yield.
Johnstone sits within Renfrewshire, its local planning authority, and the House of Commons Library classes it as a small 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.
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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 Johnstone's own coordinates (55.8369, -4.51309), 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.
Connecting solar to the Johnstone network
On NESO's licence-area map, Johnstone is in South and Central Scotland, which SP Energy Networks operates. That makes SP Energy 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 SP Energy Networks within 28 days of commissioning, with no prior approval.
A bigger inverter or battery output needs a G99 application in advance. 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 SP Energy 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 Johnstone
A heat pump in Johnstone
Solar and a heat pump pull in opposite directions through the year: Johnstone's roofs make 710 kWh from November to February on a 12-panel system, and 2,800 kWh from May to August. The heating season leans on the grid, so off-peak rates do the heavy lifting.
Scottish homes apply through Home Energy Scotland rather than the Boiler Upgrade Scheme: up to £7,500 in grant for a heat pump, up to £7,500 more as an optional interest-free loan, and a £1,500 uplift for rural and island homes (checked 28 September 2026).
Charging an EV in Johnstone
From April to September, 73% of a Johnstone roof's yearly output arrives, peaking at about 760 kWh in May on 12 panels. A car parked at home in daylight can soak up what the house, at around 70 kWh of daytime use that month, cannot.
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.
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 Johnstone
Guidance is nationwide, so the benchmarks hold in Johnstone: repair costs, service scope, and when the inverter is the real fault.
Solar in Johnstone: your questions answered
What could a roof in Johnstone generate?
PVGIS puts a roof in Johnstone at 851 kWh per kWp a year, 2.33 peak sun hours a day averaged across the seasons. A 12-panel, 6.36 kWp system makes about 5,410 kWh a year, most of it between April and September.
What would 12 solar panels cost in Johnstone?
£6,360 for 12 panels (6.36 kWp), the same as in every other place we cover, because solar is priced at £1,000 per kWp installed rather than by area. A battery adds its own installed price on top. Where Johnstone differs is output: about 5,410 kWh a year from that system.
Do I need permission from the DNO for solar in Johnstone?
Usually not in advance. SP Energy Networks, the network operator for Johnstone, 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 SP Energy Networks as it does every network operator. "See our DNO explainer.
How much would export pay on a system in Johnstone?
It is exported. With typical use and no battery, about 4,476 kWh of the 5,410 kWh a 12-panel system makes in Johnstone goes to the grid, around £537 a year at 12p. A battery keeps more of it for the evening; the export rates table shows what suppliers pay.
Do solar panels work in winter in Johnstone?
Yes, at a lower level. PVGIS gives Johnstone 18.1 kWh per kWp in December and 20.9 in January, so a 12-panel system makes about 120 kWh and 130 kWh in those months, against 760 kWh in May. Winter output mostly covers daytime use rather than exporting.
How Johnstone compares with its neighbours
How the towns nearest Johnstone compare on the same PVGIS settings, closest first.
| Town | kWh per kWp a year | vs Johnstone |
|---|---|---|
| Johnstone | 851 | this town |
| Linwood | 851 | level |
| Paisley | 858 | +7 kWh |
| Bishopton | 857 | +6 kWh |
| Erskine | 861 | +10 kWh |
| Barrhead | 861 | +10 kWh |
| Renfrew | 860 | +9 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 Johnstone: Solar panels in Johnstone from OVO Solar & Battery
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Reading for Johnstone homeowners
Sourced, dated and written by us. The same ground we cover on your free call.
Do solar panels work in winter? Yes, just less than summer
Panels run on light, not sunshine. Cloud turns them down, not off. What that means for an awkward roof.
Read the guide →Adding a battery to solar panels you already own
Retrofitting a battery to working solar is straightforward. The paperwork is where people trip up.
Read the guide →Home EV charger types and speeds, explained properly
Granny cable, 7kW wall unit or 22kW three phase. What each adds per hour, and which you need.
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 →Which tariffs are actually built for battery charging
A battery buys cheap and uses dear. The tariff decides how much that is worth.
Read the guide →NAPIT, NICEIC and competent person schemes: who tells building control about your solar
Solar work is notifiable. A competent person scheme means your installation team notifies, not you.
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.