Llanelli is one of FLD’s most active commercial solar markets. The town sits at the edge of the Loughor Estuary with good south-facing roof exposure, a large industrial and retail base, and a cluster of employers whose energy intensity makes commercial solar immediately compelling.
This guide covers the commercial buyer’s perspective: yields, major employer context, business park stock, and the planning considerations specific to SA14.
Solar yield in Llanelli
PVGIS data for Llanelli (SA15) returns a typical annual yield of 960 to 975 kWh per kWp. This is marginally higher than central Swansea due to Llanelli’s coastal position and slightly lower average cloud cover. For a 150 kWp commercial system, the annual generation is approximately 144,000 to 146,000 kWh.
The estuarine and coastal exposure that gives Llanelli its slightly higher yield also means occasional wind loading requirements need to be checked for exposed roof positions facing south-west across the estuary. FLD assesses wind loading as standard on all Llanelli quotations.
The major employers and what they mean for solar
Tata Steel Tinplate, Trostre Works is Llanelli’s largest industrial employer and its most energy-intensive site. Tata’s Scope 3 reporting requirements under their net-zero roadmap are creating direct procurement pressure on local suppliers and sub-contractors. A Tata supply chain business in SA14 or SA15 that can demonstrate renewable generation on its own site may find it moves up the supplier scorecard. Commercial solar has become a procurement decision as well as an energy cost decision in this context.
Trostre Retail Park is the largest retail concentration in West Wales. The park has undergone significant roof investment in recent years; several of the larger units have south-facing roofs with clear sky access and high daytime commercial electricity consumption. Retail park solar works particularly well where the occupier runs air conditioning or refrigeration loads during daylight hours, which is typical here.
WWT Llanelli (Wildfowl and Wetlands Trust) is a significant local attraction and a visitor economy anchor. As a charity with sustainability objectives, it is a natural candidate for solar but faces the public charity procurement challenge: Salix Finance is not available to non-educational charities, and the standard commercial PPA structure is the most practical route.
Pemberton Business Park (SA14) is the primary modern industrial estate in Llanelli, with a mix of manufacturing, distribution, and trade counter occupiers. Several units have been built since 2000 with structural loadings that accommodate solar without modification. FLD has completed commercial installations on Pemberton and knows the estate’s DNO supply infrastructure well.
Worked example: 150 kWp manufacturer, SA14
- Installed cost: approximately £125,000
- Annual generation at 965 kWh/kWp: 144,750 kWh
- Self-consumption at 72% at 29p/kWh: £30,248
- Export at 28% at 12p SEG: £4,863
- Year-one benefit: £35,111
- Simple payback: 3.6 years
- Post-tax payback with Annual Investment Allowance: 2.6 years
At 22% post-tax IRR over 25 years, this is a straightforward commercial decision for an owner-occupier with the capital available.
Planning considerations in Llanelli
Llanelli sits within Carmarthenshire County Council’s planning authority area (not City and County of Swansea, despite its proximity). This matters because planning officers and local development plans differ between the two authorities.
For commercial rooftop solar in Llanelli, the Welsh PDR rules apply uniformly: installations on existing industrial buildings under 1 MW are permitted development in most cases, provided the system is more than 10 metres from the building edge. Trostre Retail Park and Pemberton Business Park fall clearly within this category.
Exceptions: The Felinfoel Conservation Area, which covers parts of the village north of Llanelli, applies residential PDR restrictions. Any solar installation on a property within the conservation area boundary should be checked with Carmarthenshire before proceeding.
DNO connection: Llanelli under SP Manweb
This is the single most important difference between Llanelli and Swansea from a project planning perspective. Llanelli sits within SP Manweb’s distribution zone, not NGED. SP Manweb serves most of North and West Wales and part of South West Wales west of the Amman Valley. Their G99 Type A connection timelines and application process differ from NGED.
Current SP Manweb G99 timelines for systems under 1 MW in SA14 to SA16 postcodes are running at 14 to 20 weeks. Their pre-application feasibility service can confirm available export capacity before a formal G99 submission, which FLD always uses for Llanelli projects to avoid investing in a full application before confirming grid headroom.
Getting a Llanelli commercial solar quote
Llanelli is 20 miles west of FLD’s Swansea base. We have directly-employed engineers covering the SA14 to SA16 postcodes regularly, and we have prior knowledge of the DNO supply infrastructure on the main commercial parks. Call Paul on 01792 680611 or use the contact page to arrange a site survey.