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Commercial Solar PV Installation in South Wales

Factory, warehouse and commercial rooftop solar from 30 kWp to 1 MW across Swansea, Cardiff, Newport, Pembrokeshire and the wider South Wales region.

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

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), Ty-Croes Assisted Living Centre in Llanybyther, and premium residential new-builds in Bridgend. The commercial solar portfolio is growing fast with the Tata Port Talbot supply-chain Scope 3 pressure and the Celtic Freeport activation.

Our process

  1. 1
    Site survey

    A named FLD engineer visits your site, measures the roof or installation zone, inspects the incoming supply and verifies load, structural integrity and orientation. For commercial sites we run a full discovery including half-hourly consumption data where available.

  2. 2
    Design and proposal

    We produce a scaled layout, generation model using PVGIS data, financial model with simple and post-tax payback, DNO G99 or G98 notification pack where relevant, and a fixed-price quotation. Every proposal names the exact panels, inverters and mounting system.

  3. 3
    DNO and planning

    We handle NGED G99 Type A applications for commercial systems, G98 notifications for domestic, and any permitted development confirmation or full planning submissions required for listed buildings or conservation areas.

  4. 4
    Install and commission

    FLD directly-employed engineers install under a single NICEIC Approved Contractor sign-off. Commissioning includes BS 7671 testing, SolarEdge monitoring portal setup, MCS certification where applicable, and handover of all documentation.

  5. 5
    Aftercare

    Insurance-backed NICEIC warranty, 25-to-30-year panel performance warranty from the tier-1 manufacturer, 12-year SolarEdge inverter warranty, and ongoing O and M support including remote performance monitoring.

Completed commercial rooftop solar array installed by FLD Solar & Electrical

180 kWp commercial rooftop array, South Wales — FLD installation

Solis 5G Series commercial solar inverters in plant room
Solar panel installation in progress on industrial facility roof

Recent FLD installation — view all project photos

Standards we work to

  • BS 7671
  • G99 Type A
  • MCS 017
  • MCS 3002:2025
  • IEC 61215
  • IEC 61730

Equipment and components

  • SolarEdge
  • Trina Vertex
  • JA Solar DeepBlue
Coverage

Commercial Solar PV Installation available in

Swansea Cardiff Newport Llanelli Neath Barry Cwmbran Llandovery St Davids Lampeter Chepstow Aberystwyth Kidwelly Newtown Builth Wells Machynlleth Tywyn Fishguard All 30 locations
From the blog

Further reading

Commercial solar Abergavenny: NP7 food festival town, conservation planning and SP Manweb connections

Commercial solar for Abergavenny NP7 -- food tourism and hospitality payback models, conservation area planning for commercial properties, SP Manweb rural connections and Ynni Cymru grant eligibility.

4 min
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Commercial solar Pontypool: NP4 Mamhilad industrial, Blaenafon World Heritage and NGED connections

Commercial solar for Pontypool NP4 and Mamhilad -- industrial park payback models, Blaenafon World Heritage context, NGED G99 timelines and Ynni Cymru grant eligibility for NP4 businesses.

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FAQ

Frequently asked questions

A Power Purchase Agreement is a financing arrangement where we fund and install a rooftop solar system at no upfront cost. Your business buys the electricity the system generates at a fixed, RPI-indexed rate that is lower than your grid tariff. The PPA typically runs 10 to 25 years. At the end you can extend, buy out at a pre-agreed residual value, or have the system removed. It suits businesses that want immediate savings without capital outlay and that are credit-worthy with a stable site.
At 30p/kWh grid electricity, a 100 kWp system generating 95,000 kWh/yr with 70% self-consumption delivers around £24,000 of year-one benefit against c. £85,000 capex, a 3.5-year simple payback. Under Annual Investment Allowance first-year 100% relief, post-tax payback is closer to 2.6 years. South Wales yields 940 to 985 kWh/kWp/year depending on postcode, comfortably enough for commercial solar to be cashflow positive from month one with a PPA.
We specify SolarEdge inverters with Trina Vertex or JA Solar DeepBlue panels as our standard stack. SolarEdge string optimisers give panel-level monitoring and isolate shading losses. Trina and JA are both tier-1 bankable manufacturers with 25 to 30-year performance warranties. For specific projects we can specify alternative tier-1 brands if building, warranty or finance requirements dictate.
Once DNO G99 connection approval is in place and materials are on site, a typical 100 kWp rooftop install takes 5 to 8 working days. The critical-path item is usually the NGED Type A connection approval, which is 3 to 6 months in South Wales in 2026. We manage that application as part of our scope.
If your self-consumption rate sits below about 60%, or your site has significant evening or night load, a battery shortens payback and lifts return. For most daytime-operating warehouses and factories already at 70%-plus self-consumption, batteries are optional and we sometimes advise against them to keep payback tight. We model both cases in the proposal.
Yes, depending on organisation type. Welsh SMEs and public bodies can access the Welsh Government Energy Service, Ynni Cymru Capital Grants (approximately £10 m in 2026-27, £25,000 to £1 m per project) and Development Bank of Wales Green Business Loans. Welsh public-sector bodies use Salix Wales Funding Programme rather than the English Public Sector Decarbonisation Scheme. Farms may be eligible under Farming Connect. Always check current-year terms before committing.
Most rooftop non-domestic solar is permitted development under the Welsh General Permitted Development Order amendments, subject to limits such as 20 cm protrusion on pitched roofs and 1 m on flat roofs, and with restrictions for listed buildings and conservation areas. Ground-mount beyond those PD limits needs a full planning application. Systems over 10 MW are a Development of National Significance determined by Welsh Ministers.
G99 is the Engineering Recommendation governing how generation equipment connects to the UK distribution network. For commercial solar above 16 A per phase, you need G99 approval from your District Network Operator before export. In South Wales that is National Grid Electricity Distribution (NGED, formerly Western Power Distribution). Type A connections are the standard sub-1 MW route, typically 3 to 6 months in 2026.

Ready for a fixed-price quotation?

Speak to Paul directly. Most quotes turn around within five working days of a site survey.

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