Solar in Wales: generation and cost

Across the 66 places we model in Wales, the median is 880 kWh a year for every kWp installed — against a UK median of 908. Individual towns and councils are listed below.

The median place we model in Wales produces 880 kWh a year per kWp, against a UK median of 908 across all the places in our set.

Installed cost on these pages uses the region’s own mean in the official cost statistics — the full table is on cost per kW.

The largest places we model here

PlacekWh per kWpLive postcodes
Milford Haven978395
Pembroke967233
North Cornelly and Kenfig Hill961270
Barry, Vale of Glamorgan9601,203
Pembroke Dock958267
Holyhead953373
Porthcawl950407
Sarn, Tondu and Bryncethin950266
Bridgend9481,084
Penarth940683
Cardiff9397,273
Port Talbot936778
Llanelli9321,047
Newport9302,914
Haverfordwest930417
Chepstow927328
Caldicot922233
Caerphilly920682
Gorseinon913270
Swansea9123,990

Postcode counts are a size proxy from the ONS Postcode Directory, not population.

What varies within a region

More than between regions, usually. Two houses in the same town can differ by more than the gap between Wales and the national median, because orientation, pitch and shading dominate — which is why every place page here ends by pointing at the calculator rather than at a headline number.

Sources

  1. PVGIS 5.3 European Commission, Joint Research Centre · Accessed 20 August 2026 One run per place at its own postcode centroid. Contains modified Joint Research Centre data.
  2. Solar photovoltaic (PV) cost data Department for Energy Security and Net Zero · Accessed 20 August 2026 · OGL v3.0

Contains public sector information licensed under the Open Government Licence v3.0.

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