Key facts
| Council area | West Dunbartonshire |
| Population | 21,036 (Dumbarton locality, Scotland's Census 2022 (NRS figure as published by City Population)) |
| Network operator | SP Energy Networks (SP Distribution, Central and Southern Scotland) |
| Main employment areas | Lomondgate Business Park; Vale of Leven Industrial Estate |
| Indicative yield | About 853 kWh per kWp a year (south facing, 30 degrees) |
| Nation support page | Grants and reliefs in Scotland |
Where businesses are in Dumbarton
- Lomondgate Business Park: One of West Dunbartonshire's Strategic Economic Investment Locations, combining Lomondgate Business Park, a roadside service area and the BBC's Dumbarton Studios.
- Vale of Leven Industrial Estate: The northern part of Lomondgate, in a woodland setting along the River Leven around the Category A listed Strathleven House; the council names Aggreko, Innova NanoJet Technology and Chivas among its significant employers.
Large employers and sectors with sites here include:
- Whisky bottling (Chivas Brothers, Kilmalid): In 2023 Chivas Brothers, part of Pernod Ricard, said about 1,100 people worked at its Kilmalid bottling site in Dumbarton, which it called the backbone of its Scottish operations, and it began a project worth well over £10 million to remodel the campus.
- Power equipment (Aggreko): In 2021 Aggreko invested £4.5 million to bring its three Dumbarton sites together at Lomondgate, where it builds modular power, storage and temperature control systems, creating a campus for about 300 staff.
Large, simple roofs on distribution sheds and modern industrial units are usually the quickest and cheapest to fit. Older mill, factory and workshop buildings can work well too, but often need a structural survey first, and roofs from before 2000 may contain asbestos cement: see asbestos roofs.
Grid connection
Dumbarton is served by SP Energy Networks (SP Distribution, Central and Southern Scotland). Almost every commercial system needs G99 approval from the network operator before it is switched on, and the question is usually how much the local network can take back. Where export is limited, a G100 export limitation scheme can let a larger array connect. See G99 and DNO applications.
Planning in Dumbarton
Planning in Dumbarton is decided by West Dunbartonshire council under Scotland's own system. Non-domestic rooftop solar is often permitted development under the Scottish rules, but not on listed buildings, in National Scenic Areas or within 3 km of an aerodrome.
Points that come up locally:
- The Dumbarton Town Centre Conservation Area was designated on 11 October 2019, with its appraisal approved in April 2023; it brings solar panels under planning control, and there are nineteen listed buildings in or near it, so check before fitting panels on roofs in the centre.
- Since 24 May 2024, Scotland's Class 6J lets solar PV go on non-domestic buildings without planning permission if it protrudes no more than 1 metre, but not on a listed building or within its curtilage, within 3 km of an aerodrome or technical site, or, in a conservation area, on the principal elevation or a side elevation fronting a road.
Our guides on listed buildings and conservation areas, airports, glint and glare explain what these mean for a solar project.
What a business roof in Dumbarton could generate
Modelled with PVGIS for the town centre, a south-facing roof at 30 degrees produces about 853 kWh per kWp a year.
| Item | Illustrative figure |
|---|---|
| System | 100 kWp, south facing at 30 degrees |
| Installed cost | £900 per kWp, so £90,000 excluding VAT |
| Generation | About 85,300 kWh a year |
| Used on site | 70% at 24p = £14,330 saved |
| Exported | 30% at 5p = £1,280 earned |
| Total a year | About £15,610 |
| Simple payback | About 5.8 years before tax relief |
Illustrative, not a quote: the same sums as our commercial solar calculator. A company paying corporation tax can usually shorten the payback with capital allowances.
Funding and support
- Business Energy Scotland SME Loan: Interest-free loans of £1,000 to £130,000. Cashback of 75% of eligible costs, up to £20,000 for energy efficiency measures and up to £10,000 for heat pumps, biomass boilers and solar thermal, with a maximum of £30,000 per business. Applications are processed on a rolling basis all year round, subject to the overall availability of loan funds. The page says the scheme is not accepting new applications for solar PV projects. Check the scheme's own page for eligibility and closing dates.
National reliefs apply too: see grants and reliefs in Scotland.
Solar across West Dunbartonshire
At the end of 2025, West Dunbartonshire had 2,040 solar PV installations with 6.8 MW of capacity, up 95% since 2020, according to government figures. The West Dunbartonshire page has the full local figures and how they compare.
Nearby towns
- Greenock, about 7 miles away
- Paisley, about 9 miles away
- Kirkintilloch, about 16 miles away
- East Kilbride, about 20 miles away
Sources
- citypopulation.de: S52000205 dumbarton
- citypopulation.de: scotland
- west-dunbarton.gov.uk: lomondgate vale of leven industrial estate
- west-dunbarton.gov.uk: strategic sites
- dumbartonreporter.co.uk: 23850447.chivas reveals 10m expansion plan dumbarton site
- dramscotland.co.uk: chivas brothers invest in staff and community at
- scottishconstructionnow.com: aggreko invests 4 5m to upgrade dumbarton production
- gov.uk: maps of glasgow city region investment zone tax
- gov.uk: maps of forth green freeport tax sites
- gov.uk: maps of inverness and cromarty firth green freeport
- west-dunbarton.gov.uk: conservation areas
- west-dunbarton.gov.uk: dumbarton tc conservation area appraisal finalised 2023 04
- legislation.gov.uk: made
- businessenergyscotland.org: sme loan
- Yield: PVGIS 5.3 (European Commission Joint Research Centre), SARAH3 data, 14% system losses, for the town centre, modelled 4 November 2026.
- Council area figures: DESNZ, renewable electricity by local authority 2014 to 2025.
Frequently asked questions
Who is the electricity network operator in Dumbarton?
SP Energy Networks (SP Distribution, Central and Southern Scotland). Most commercial solar systems need its G99 approval before they are switched on. The operator follows the postcode, so confirm yours with the Energy Networks Association postcode tool.
How much would a 100 kWp solar system generate in Dumbarton?
About 85,300 kWh a year for a south-facing roof at 30 degrees, modelled with PVGIS for the town centre. At 70% used on site at 24p and the rest exported at 5p, that is worth about £15,610 a year. Your own roof, orientation and use will change this.
Can a business in Dumbarton get a free solar survey?
Yes. Answer six short questions and we match the site with one MCS certified installer, who surveys it on site or by video call. It is free, with no obligation. Get a free survey.
Related pages
- West Dunbartonshire2,040 installations, 6.8 MW of solar and about 827 kWh per kWp a year for a south-facing roof.
- ScotlandSP Energy Networks and SSEN connections, NPF4 and Scottish permitted development, the four city low emission zones, the Scottish rates exemption and realistic yields.
- Commercial solar calculatorEstimate commercial solar savings and payback, with the generation, price and cost assumptions shown and sourced, and the limits of a simple estimate explained.
- ScotlandCurrent solar support in Scotland for businesses, community groups, public bodies, schools and farms, with rates, planning and official contacts.
- Planning permissionPermitted development for commercial rooftop solar and car park canopies in England, prior approval, heritage limits, ground-mounted schemes and the other UK nations.