Solar panels in Carmarthenshire and Pembrokeshire
Figures updated 15 November 2026
A 4 kWp system facing south makes about 3,688 kWh a year here. For a gas-heated semi that saves £658 a year and pays back in 10.8 years, on Octopus Flux Import.
Output by roof direction
| 4 kWp at 35°, facing | kWh a year |
|---|---|
| South | 3,688 |
| South-east or south-west | 3,496 |
| East or west | 2,976 |
Electricity prices in South Wales
| Price cap unit rate | 26.6p per kWh |
| Price cap standing charge | 55.4p a day |
| Outgoing Octopus export | 12.0p per kWh |
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Areas covered
Carmarthenshire, Pembrokeshire.
MCS solar zone 13 (Aberystwyth), electricity region South Wales. Example: a semi using 2,673 kWh of electricity a year, roof facing south at 35° with no shade; savings at electricity prices from April 2027, when VAT is due to return. Every district listed has at least 95% of its postcodes in this zone and region. Areas from the ONS National Statistics Postcode Lookup; electricity regions supported by National Energy SO Open Data. Sources