Kidwelly, or Cydweli, sits between Llanelli and Carmarthen on the SA17 postcode stretch. It is a small coastal town with a disproportionately solid commercial base, driven by the light-industrial estate at Mynydd-y-Garreg, the agricultural belt out towards Pontyates, and a steady hospitality trade around the Castle and the Gwenllian trails. For commercial solar, Kidwelly is a clean installation environment with good yields and no unusual planning constraints outside the town centre conservation area.
SA17 solar yield
PVGIS returns 955 to 975 kWh per kWp per annum for a well-oriented commercial rooftop array in SA17. The site sits fractionally above the Llanelli and Carmarthen averages because of the coastal aspect. A 50 kWp south-facing array typically delivers 47,500 to 48,500 kWh in year one.
Where the commercial opportunities are
- Mynydd-y-Garreg light industrial — the estate on the A484 side of the town has a spread of single-skin metal-sheet rooftops ideally suited to 30 to 150 kWp arrays. Loads are generally weekday daytime, so self-consumption is typically 70 to 80 percent without batteries.
- Agricultural and dairy — the SA17 rural belt runs out towards Pontyates, Carway and Trimsaran. Barn roofs of 300 to 800 square metres regularly take 50 to 200 kWp arrays with excellent self-consumption if there is bulk tank cooling or ventilation load.
- Hospitality — the Gatehouse, the Kidwelly Arms and the coastal lets along the Gwendraeth Estuary all have material summer electricity loads that correlate with peak solar output.
Carmarthenshire planning
Carmarthenshire County Council’s approach to rooftop PV is straightforward. For commercial buildings outside the Kidwelly town centre conservation area (which is tightly drawn around the Castle, the medieval town and the bridge), permitted development almost always applies. Key conditions:
- Panels must not project more than 200 mm above the roof plane
- The building must not be listed
- The site must not be within a scheduled monument boundary
The Kidwelly Castle scheduled monument footprint is small and well-defined. Most commercial sites in the town are outside it.
Grid connection (NGED)
SA17 sits in NGED’s licence area. G99 Type A applications for 50 to 1,000 kWp consistently come back in 6 to 8 weeks across our recent Kidwelly and Llanelli work. Supply capacity matters more than consented solar rating: if the existing incoming supply is 100 kVA and you want to install 150 kWp of PV, the DNO will either need to upgrade the supply or you will need to accept an export limit. We model this during the survey.
What a Kidwelly install typically looks like
For a recent 80 kWp install on a SA17 light-industrial rooftop, we delivered the system from first survey to commissioning in 11 weeks, with G99 approval at 7 weeks and a four-day on-site install. Year-one generation tracked 1.5 percent above PVGIS central estimate. Self-consumption against HH data was 78 percent. Simple payback landed at 5.8 years at prevailing electricity pricing.
Logistics
Kidwelly is a 40-minute drive from our Swansea base, which is unremarkable for commercial project mobilisation. We service SA15, SA17 and SA31 on a regular rotation.
Starting the conversation
If you own or manage a Kidwelly commercial rooftop and want a frank assessment against your own half-hourly meter data, call Paul direct on 01792 321123.