Llanelli’s commercial solar market is anchored by manufacturing. The SA14 and SA15 catchment carries one of the highest concentrations of continuous-process manufacturing in west Wales — Felinfoel Brewery, the Trostre tinplate works (now Trostre Retail Park, but adjacent commercial units retain the industrial grid connection), and a cluster of food production and engineering businesses stretching from Dafen to Llangennech.
Manufacturing businesses in SA14 and SA15 have electricity consumption profiles that match solar generation well: production lines run Monday to Saturday, in-building demand is high throughout daylight hours, and self-consumption rates of 70% to 80% are achievable on well-sited roof arrays.
SP Manweb: the Llanelli DNO
All SA14 and SA15 properties are served by SP Manweb rather than NGED. This distinction matters for project programme planning. G99 Type A approval timelines for SP Manweb in 2026 run at 14 to 20 weeks, compared with 10 to 14 weeks for NGED. FLD submits DNO pre-application enquiries before confirming installation dates for all Llanelli commercial proposals.
Export headroom on the Llanelli distribution network is tighter than in some NGED areas, particularly on the substations serving Dafen and Llangennech. FLD checks substation export capacity as part of the pre-application enquiry to confirm whether export limiting is required. Export-limited systems are installed with SolarEdge zero-export or curtailment controls at no material performance penalty for sites with 70%+ self-consumption.
Felinfoel Brewery: the sector benchmark
Felinfoel Brewery is the most cited reference point for continuous-process solar in SA14. A high-energy brewing operation running 24 hours requires all-day electricity demand that absorbs solar generation almost entirely during daylight hours. FLD uses Felinfoel as the sector benchmark for continuous-process brewery, food production and similar operations when modelling self-consumption for SA14 commercial prospects.
Payback model: 200 kWp SA14 manufacturer
| Metric | Value |
|---|---|
| Annual generation | 196,000 kWh |
| Self-consumed (75%) | 147,000 kWh |
| Electricity cost saving (30p/kWh) | £44,100 |
| SEG export income (25%) | £5,880 |
| Year-one benefit | £49,980 |
| Installed cost | £172,000 |
| Simple payback | 3.4 years |
| AIA post-tax payback | 2.6 years |
Ynni Cymru and Welsh manufacturing grants
Llanelli manufacturers registered as Welsh businesses can apply to Ynni Cymru for capital grants of £25,000 to £1,000,000. For a 200 kWp installation at £172,000, a grant of £25,000 to £40,000 is within published eligibility ranges — reducing effective capex and improving post-grant payback below 3.0 years before AIA credit.
FLD provides Ynni Cymru pre-application feasibility reports for qualifying Llanelli businesses. Welsh-medium applications are available.
Battery storage for Llanelli manufacturing
Battery storage at SA14 and SA15 manufacturing sites provides two complementary benefits: evening and weekend demand management (absorbing post-solar generation into evening operations) and peak demand reduction on half-hourly metered tariffs. For manufacturers with contracted import capacities of 200 kW to 500 kW, a correctly sized battery system can reduce peak demand charges by £10,000 to £25,000 annually, in addition to the standard solar self-consumption saving.
FLD designs combined solar-plus-battery proposals for qualifying Llanelli manufacturers, including half-hourly consumption analysis to quantify the demand management opportunity.
Domestic solar in SA14 and SA15
Beyond commercial manufacturing, Llanelli’s residential stock — predominantly interwar terraces and semi-detached in the Tyisha, Glanymor and Bigyn areas — carries good south-facing roof angles for domestic solar. The SP Manweb yield for SA14 and SA15 runs at 960 to 970 kWh/kWp — slightly above the Swansea city baseline due to the more open Carmarthen Bay exposure.
A 4 kWp south-facing SA14 terrace installation at 965 kWh/kWp generates 3,860 kWh annually. At 42% self-consumption for a household with daytime occupancy, year-one benefit: approximately £775. On £7,200 installed cost, payback: 9.3 years — reasonable for a 25-year asset.
Getting a Llanelli survey
FLD covers SA14 and SA15 on regular Carmarthenshire survey days. Call Paul on 01792 680611 or use the contact page for a no-cost assessment.