Solar panels in Llanelli
£3,251 to £10,228 installed, 1,448 hours of sun a year, and 10,214 installations already in the council area.
What a system costs in Llanelli
3kWp
£3,251–£4,348
Saves up to £373 a year. Pays back in about 10 years.
4kWp (most common)
£5,186–£6,558
Saves up to £580 a year. Pays back in about 10 years.
6kWp
£7,574–£10,228
Saves up to £853 a year. Pays back in about 10 years.
Source: Home Energy Quotes Cost Index, costs modelled June 2026, savings at the October to December 2026 price cap. Prices are estimates and include installation and VAT. Actual costs may vary.
Llanelli in numbers
Published statistics for the Carmarthenshire council area, not our estimates.
At the end of 2025 there were 10,214 solar PV installations in the Carmarthenshire council area, about 124.9 for every 1,000 households, with 210 MW of capacity between them. The count covers every size of installation, on homes and businesses. 63% of homes with an EPC in the Carmarthenshire council area are rated D to G, and the median energy score is 64, which is band D.
| Carmarthenshire council area | Figure | Source |
|---|---|---|
| Solar PV installations (all sizes) | 10,214 (124.9 per 1,000 households) | DESNZ, end of 2025 |
| Homes with an EPC rated D to G | 63% | ONS, EPCs lodged to March 2025 |
| Median EPC energy score | 64 (band D) | ONS, EPCs lodged to March 2025 |
| Households on mains gas heating only | 54.3% | Census 2021, ONS |
| Electricity network operator | National Grid Electricity Distribution (South Wales) | NESO licence area boundaries |
Llanelli is served by National Grid Electricity Distribution, the electricity network operator for South Wales. Solar panels have to be registered with the network operator. Your installer normally does this: smaller systems are notified after installation, and larger ones need approval before work starts.
These are published official statistics for the Carmarthenshire council area, which covers Llanelli, not Home Energy Quotes estimates. Sources checked 6 October 2026.
Is Llanelli a good place for solar panels?
Llanelli receives an average of 1448 hours of sunshine per year — close to the UK average of 1,493 hours. Combined with Wales’s energy prices tracking the UK average, solar panels installations here may offer good value (individual results will vary).
Llanelli has a population of 42,155, and the area falls within the Wales region. We recommend getting at least 3 quotes to compare prices.
Find Installers in Llanelli
We recommend getting at least 3 quotes from qualified installers before making a decision. Check reviews, ask for local references, and make sure warranties are clearly stated in writing.
What to check before hiring an installer in Llanelli
- Qualifications — check the installer holds relevant qualifications and certifications for solar panels before signing any contract
- Local references — ask for completed jobs in Llanelli or Carmarthenshire
- Reviews — check online reviews before committing
- Warranty — product and workmanship warranties should be clearly stated in writing
- 3 quotes minimum — we recommend comparing at least three quotes to ensure you get a fair price
Questions about solar panels in Llanelli
How much do solar panels cost in Llanelli?
How many solar panel installations are there in Llanelli?
Is there a grant for solar panels in Llanelli?
Solar panels in Llanelli qualify for 0% VAT until March 2027. In Great Britain, the Smart Export Guarantee pays for surplus electricity you export to the grid, at a rate each supplier sets.
How long is the payback period in Llanelli?
Do I need planning permission in Llanelli?
How do I find a good installer in Llanelli?
Get quotes for your roof in Llanelli
Up to three approved installers who cover Llanelli may contact you. Free, no obligation.
Llanelli on the map
Solar Panels in nearby towns
Last reviewed: . Costs are modelled estimates from the Home Energy Quotes Cost Index — see how we calculate them. Grant rates are checked against GOV.UK.