solar panels for fabrication in Cardiff

Why Cardiff’s metal trades are moving on solar

Cardiff grew up on steel. The docks that shipped Welsh coal and Bessemer steel out of Cardiff Bay left the capital with a heavy-metal backbone, and while the East Moors steelworks closed in 1978, the fabrication and engineering trades that fed and followed it never went away. Today the CF postcodes hold a dense cluster of structural-steel fabricators, sheet-metal shops, jobbing welders and precision sub-contractors, many still supplying the Port Talbot and Newport steel chain down the M4. From the portal-frame units on Wentloog Industrial Estate to the older metal-bashing sheds around Pengam Green and Splott, this is a working metal city whose electricity bills have roughly doubled since 2021. For a shop running fibre lasers, plasma, MIG and TIG sets, a rotary-screw compressor and legally-required weld-fume extraction, power now trails only steel and labour as the biggest controllable cost, eating into margin on fixed-price Welsh tenders.

Wentloog, Cardiff Bay and the CF-postcode workshop estate

Wentloog Industrial Estate, on the coastal levels east of the city towards Rumney and St Mellons, is the single biggest fabrication opportunity in the Cardiff area. Its clear-span portal-frame units offer the large unobstructed roofs solar wants, typically 1,000 to 6,000 square metres, supporting 150kW to over 1MW arrays sized to a welding and machining load; Capital Business Park carries the same profile.

Closer in, Cardiff Bay Business Park and the Hadfield Road estate off Penarth Road (CF11) mix engineering and light-industrial units, while Pengam Green and the older sheds around Ocean Way and East Tyndall Street in CF24 carry on the metalworking tradition of Splott and the old East Moors. We deliver across the full workshop estate, from CF3 at Wentloog and St Mellons through CF11 and CF24 to the CF14 and CF15 units towards Llanishen and Taffs Well.

Cardiff’s 2030 net zero target and what it means for a fab shop

Cardiff Council has committed to a carbon-neutral council by 2030, two decades ahead of the national 2050 deadline, in its One Planet Cardiff strategy inside a wider Welsh Government net zero drive. For a fabricator, planning is rarely the barrier: Wales runs its own system rather than the England GPDO, but commercial rooftop solar on an existing industrial building is generally allowed, bar listed buildings and conservation areas. Procurement matters more, as Welsh public bodies, the Cardiff Capital Region and main contractors now write carbon and responsibly-sourced-steel questions into supplier scorecards, so a fabricator with an on-site renewable and its own generation data scores better at tender.

The economics follow from Cardiff’s working week: a CF-postcode shop on one daytime shift draws its heaviest current at the hours a Wentloog roof generates hardest, so 70 to 90 percent of output is used on site at the full 25 to 30p import rate rather than spilled for the 12 to 16p export rate, turning a doubled bill into a short payback. We size to that overlap from twelve months of your half-hourly meter data, not roof area; the method is on our cost page, or model it on the savings calculator.

National Grid, G99 and older Cardiff roofs

Cardiff sits in the National Grid Electricity Distribution area for South Wales, and any commercial fabrication array is effectively always a G99 connection, since output above roughly 11kW three-phase triggers it. A standard connection gets an offer in about 45 working days, a larger array needing a network study 16 to 24 weeks, so we submit the G99 on day one alongside the roof-load survey; on the older docklands network around Splott and East Moors, a tired supply can shape array size and the case for a battery.

Two roof issues recur. Many older Splott, Pengam and East Tyndall Street sheds carry asbestos-cement roofs, which pre-date the 2000 cut-off, cannot take rooftop PV directly and usually need over-cladding first, often funded inside the same project. And on the heavy structural-steel shops running EOT overhead cranes, the crane-rail and gantry dead loads must be deducted from the roof’s residual capacity before a 15 to 25 kg per square metre array goes near it, which is why a structural engineer signs off every heavy-lifting bay.

Which fabrication trades dominate Cardiff, and how each one sizes

The sub-sector on your gate changes the design; three dominate the CF estates.

Structural-steel fabrication is the heaviest presence, a legacy of East Moors and the Bay docks still feeding the Welsh construction chain off Port Talbot and Newport. These are the large clear-span structural steel sheds on Wentloog and Capital Business Park, often with EOT overhead cranes, saws, drilling lines and shot-blast plant on a steady baseload. They carry the largest roofs in the city and support the biggest arrays, commonly 250kW upwards, but the crane-rail and gantry dead loads come off the residual roof budget first, so the structural sign-off, not roof area, sets the ceiling; these sites also feel BES 6001 responsibly-sourced-steel pressure hardest at tender.

Sheet-metal and precision sub-contract work is the second strand, in the mid-size units around Hadfield Road, Cardiff Bay Business Park and Pengam Green. Here a welding and engineering workshop load is spikier, MIG and TIG sets and press brakes over a compressor and mandatory LEV baseload, and roofs are smaller, so arrays land in the 60 to 150kW band sized to anchored daytime demand. The extraction is not optional: HSE Safety Bulletin STSU1-2019 classes all welding fume as a carcinogen, so LEV ductwork and discharge stacks penetrate the same roof as the panels, and we plan the layout around them.

Laser and plasma profiling is the fastest-growing strand on the newer Wentloog and St Mellons units, and sizes differently again. A fibre laser’s chiller, servo drives and assist-gas compressor draw a large, near-constant load whenever the machine is powered, far more than the beam itself, so we size to that continuous auxiliary baseload, not the laser nameplate; these houses cut long hours, so almost every kWh is self-consumed, justifying the larger 100 to 400kW arrays and the fastest paybacks in the city. We deliver across Cardiff and out into Penarth, Barry, Caerphilly, Newport and Pontypridd, with RC62-compliant fire-safe design as standard. Tell us which trade you run and we will say honestly whether your site suits solar. Request a quote.