Commercial solar installers in Carmarthen

Key facts

Where businesses are in Carmarthen

• Cillefwr Industrial Estate: Industrial and trade estate in Carmarthen beside the Tenby to Carmarthen railway line, home to Screwfix and Howdens among others. An outline application for 12 more industrial units on 1.1 hectares across the line, near Llanllwch, went to the council in May 2024.
• Canolfan S4C Yr Egin: Creative and digital business hub on the University of Wales Trinity Saint David campus, with S4C among its tenants. In March 2025 the university said it was fully occupied, with 16 companies based there full time plus hot desking and an auditorium.

Large employers and sectors with sites here include:

• Creative and Welsh language media: Yr Egin's tenants include the broadcaster S4C and production and digital firms such as Boom Cymru, Gorilla and Lens 360, and the centre was fully occupied in March 2025.
• Food distribution (Harlech Foodservice): In February 2024 Welsh food wholesaler Harlech Foodservice said it was opening a new depot in Carmarthen as part of a £6 million expansion, creating 15 jobs in South West Wales.

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

Carmarthen is served by National Grid Electricity Distribution (South Wales). 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 Carmarthen

Planning in Carmarthen is decided by Carmarthenshire council under the Welsh rules. Many non-domestic roofs are covered by Welsh permitted development, with conditions, but not within 3 km of an airport or aerodrome or on listed buildings.

Points that come up locally:

• The Carmarthen Town Conservation Area, designated in 1971, holds the greatest number of the town's listed buildings, including the Grade I castle and the Grade II County Hall, and its appraisal stresses the town's roofscape, so check before planning panels in the centre.
• In Wales, roof panels on a non-domestic building are usually permitted development if they stand no more than 200mm proud of the roof, but in a conservation area panels on a principal or side elevation wall visible from a highway need planning consent, and a listed building needs planning permission and listed building consent.

Our guides on listed buildings and conservation areas explain what these mean for a solar project.

What a business roof in Carmarthen could generate

Modelled with PVGIS for the town centre, a south-facing roof at 30 degrees produces about 980 kWh per kWp a year.

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

• Development Bank of Wales Green Business Loan Scheme: Discounted fixed interest rate loans for energy efficiency measures and low carbon projects, with renewables including solar PV listed as eligible projects. Limited companies, sole traders and partnerships must be based in Wales, have traded for at least two years and have at least one set of filed annual accounts. A grant of up to 50% of the cost of a detailed energy audit, to a maximum of £10,000 (£20,000 total costs), is also offered. Check the scheme's own page for eligibility and closing dates.

National reliefs apply too: see grants and reliefs in Wales.

Solar across Carmarthenshire

At the end of 2025, Carmarthenshire had 10,214 solar PV installations with 210.0 MW of capacity, up 79% since 2020, according to government figures. The Carmarthenshire page has the full local figures and how they compare.

Nearby towns

• Llanelli, about 14 miles away
• Ammanford, about 15 miles away
• Neath, about 25 miles away
• Haverfordwest, about 28 miles away

Sources

• ons.gov.uk: census2021
• ons.gov.uk: datadownload.xlsx
• tenby-today.co.uk: 12 units proposed between a40 and tenby to
• uwtsd.ac.uk: canolfan s4c yr egin welcomes mentera its thriving
• tradeandinvest.wales: yr egin
• wales247.co.uk: welsh food giant creates 15 jobs at new
• businesswales.gov.wales: enterprise zones
• gov.uk: maps of celtic freeport tax sites
• carmarthenshire.gov.wales: ccaa 01 carmarthen town new final issue
• gov.wales: planning permission solar panels non domestic
• developmentbank.wales: green
• 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.