Commercial solar installers in Porthmadog

Key facts

Where businesses are in Porthmadog

• Penamser Industrial Estate: Trading and industrial estate in Porthmadog; in November 2022 Lock Stock announced a one acre storage park there, beside the town's Aldi store, with capacity for over 160 shipping containers.

Large employers and sectors with sites here include:

• Heritage railways and tourism (Ffestiniog and Welsh Highland Railways): The railways' Boston Lodge Works near Porthmadog, listed by Guinness World Records as the world's oldest railway workshop, won the top National Railway Heritage Award in December 2025 after a £5 million restoration, with public tours planned from 2026.
• Brewing (Purple Moose): Purple Moose Brewery brews in a former foundry in Porthmadog, part of the Union Ironworks opened in 1862, supplies about 240 pubs with cask ale and runs the town's Australia and Station Inn pubs.

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

Porthmadog is served by SP Energy Networks (SP Manweb, Merseyside and North Wales licence area). 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 Porthmadog

Planning in Porthmadog is decided by Gwynedd 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 Porthmadog Conservation Area, designated on 7 March 1974, covers about 26.8 hectares and 40 postcodes, so check whether a building is inside it before planning roof panels in the centre.
• In Wales, roof panels on a non-domestic building should project no more than 200mm from the roof, stay at least 1 metre from the roof edge and, on a flat roof, rise no more than 1 metre, but a listed building needs planning permission and listed building consent, and in a conservation area panels on a principal or side elevation wall visible from the highway need planning consent.

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

What a business roof in Porthmadog could generate

Modelled with PVGIS for the town centre, a south-facing roof at 30 degrees produces about 863 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 green business loans for energy efficiency measures and low carbon projects, with renewables including solar PV listed as typical eligible projects; capital repayment holidays are available and the loan term is linked to the project's payback. 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 by an accredited independent expert, 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 Gwynedd

At the end of 2025, Gwynedd had 6,788 solar PV installations with 66.5 MW of capacity, up 72% since 2020, according to government figures. The Gwynedd page has the full local figures and how they compare.

Nearby towns

• Caernarfon, about 16 miles away
• Llandudno, about 30 miles away
• Colwyn Bay, about 30 miles away
• Holyhead, about 34 miles away

Sources

• citypopulation.de: W45000175 porthmadog
• businesswales.gov.wales: snowdonia enterprise zone
• businesswales.gov.wales: enterprise zones
• gov.uk: maps of celtic freeport tax sites
• gov.uk: maps of anglesey freeport tax sites
• gov.uk: maps of flintshire and wrexham investment zone tax
• wales247.co.uk: north wales storage giant to open new gwynedd
• nation.cymru: welsh heritage railway wins major award for 5
• pelliclemag.com: iechyd da beer trains and welsh heritage at
• heritagecheck.co.uk: porthmadog
• 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.