Commercial Solar PV Installation in South Wales

Why commercial solar pays back in South Wales

South Wales receives 940 to 985 kWh/kWp per year according to PVGIS irradiation data, with Pembrokeshire among the highest-yielding counties in the UK. Paired with commercial grid electricity at 28 to 32 p/kWh in 2025-26, the economic case is clear.

Worked example: 100 kWp commercial system

• Installed cost: approximately £85,000
• Annual generation: 95,000 kWh
• Self-consumption at 70% at 30p/kWh: £19,950 saving
• Export at 30% at 12p SEG: £3,420
• Year-one benefit: £23,370
• Simple payback: 3.6 years
• Post-tax payback with 100% Annual Investment Allowance relief: 2.6 years

Proven at scale: 637 kW for Irvin-GQ

The economics above are not theoretical. FLD designed and delivered a 637 kW rooftop array for Irvin-GQ, the defence and aerospace manufacturer at Llangeinor, Bridgend — a £525,000 project across two roof elevations on a Valk flat-roof ballast system, five Solis 110 kW Pro three-phase inverters, and an NGED G99 connection coordinated in parallel with procurement so the programme never slipped. Against site consumption of 1,076,078 kWh a year the building now runs fully off-grid at peak generation, with payback in 3 years, a lifetime ROI of £3 million and 441.6 tonnes of CO2 saved annually. Installation was phased so production never stopped, under a single NICEIC Approved Contractor sign-off. Read the full Irvin-GQ case study — including why their MoD supply-chain Scope 3 reporting drove the deadline.

No other commercial solar installer in South Wales publishes a delivered project at this scale with the figures attached. If your board needs proof before capital sign-off, this is it.

How to choose a commercial solar PV installer in South Wales

Most commercial solar pages explain payback. Almost none tell you how to tell one contractor from another, which is the actual decision in front of you. Five questions separate them:

1. Have they delivered at your scale, and will they name the project? Ask for a system size, a site and a figure. Ours is Irvin-GQ at Llangeinor, Bridgend — 637 kW across two roof elevations, £525,000, five Solis 110 kW Pro inverters on a Valk flat-roof ballast system, 3-year payback and 441.6 tonnes of CO2 saved a year.
2. Who holds the electrical sign-off? Many solar firms subcontract the electrical work and the DNO application. We are an NICEIC Approved Contractor, so the array, the switchgear and the connection are certified under one registration — which is why we are trusted on live acute sites like the 236.5 kWp SolarEdge installation at Princess of Wales Hospital, delivered under Cwm Taf Morgannwg permit-to-work without interrupting the ward.
3. Do they run the G99 themselves? The NGED Type A approval is the critical path on almost every commercial job — 3 to 6 months in South Wales. We lodge it in parallel with procurement rather than after it.
4. Can they work around your operation? Phased installation so production never stops is a scheduling commitment, not a slogan. Ask how they did it last time.
5. Are they set up for your procurement? ConstructionLine and SSIP registration is what gets a contractor through a framework or tender gate. If you are a public body or a tier-1 supply chain, this one is not optional.

Where we work. We install commercially across South Wales — Swansea, Neath, Port Talbot, Llanelli, Bridgend, Carmarthen, Cardiff, Newport and the wider M4 corridor. We are Swansea-based, so if your site is outside that region we will say so rather than quote it.

What we install

Our standard specification is SolarEdge string optimiser inverters paired with Trina Vertex or JA Solar DeepBlue tier-1 panels. SolarEdge delivers panel-level monitoring and isolates shading losses at the module rather than the string, typically recovering 5 to 15% of annual yield on complex rooftops.

We cover ballasted flat-roof systems, trapezoidal-clad pitched-roof industrial installations, standing-seam fixings, slate and tile domestic-commercial conversions, and ground-mount arrays on marginal land.

Regulatory context

• BS 7671 18th Edition governs every electrical aspect of the install
• G99 Type A connection agreement with National Grid Electricity Distribution (formerly Western Power) for systems above 16 A per phase, currently 3 to 6 months in South Wales
• MCS 017 product listing for all panels and inverters used on sub-50 kW systems
• ESOS compliance for businesses over 250 staff or £44 m turnover
• SECR reporting for quoted and large unquoted UK companies
• MEES B-by-2030 for non-domestic landlords, rising from E today

Finance options

Three structures, chosen in the proposal stage:

1. Self-finance with 100% Annual Investment Allowance
2. Commercial Solar PPA with zero upfront cost, RPI-indexed unit rate below grid
3. Asset finance over 3 to 7 years, hire purchase or lease

Every structure is modelled side-by-side so you can pick on cashflow and balance-sheet treatment, not on sales pressure.

Sector experience

FLD delivers to the factory, warehouse, farm, school, hotel and office verticals across South Wales. Reference delivered projects include Cardiff Crown Courts (electrical) and premium residential new-builds in Bridgend. The commercial solar portfolio is growing fast with the Port Talbot supply-chain Scope 3 pressure and the Celtic Freeport activation.