Solar Panels Wales: Costs, Output & Grants

4kW system annual generation across Wales:

| Location | Sun Hours/yr | Yield (kWh/kWp) | 4kW Output | |----------|-------------|----------------|------------| | Cardiff | 1,600 | 1,000 | 4,000 kWh | | Swansea | 1,580 | 990 | 3,960 kWh | | Newport | 1,590 | 995 | 3,980 kWh | | Pembrokeshire | 1,620 | 1,010 | 4,040 kWh | | Carmarthen | 1,550 | 970 | 3,880 kWh | | Aberystwyth | 1,500 | 940 | 3,760 kWh | | Wrexham | 1,450 | 920 | 3,680 kWh | | Bangor | 1,420 | 900 | 3,600 kWh |

Key insight: South Wales performs almost identically to Bristol and southern England. Even North Wales generates only 10–12% less than Cardiff — still firmly worthwhile.

Pembrokeshire advantage: The south-west Welsh coast receives some of the highest solar irradiance in Wales, comparable to the best of southern England.

Source: PVGIS Welsh irradiance data; Met Office sunshine records.

UK-wide support (available in Wales): - 0% VAT on solar installation (until March 2027) - Smart Export Guarantee (4–15p/kWh for surplus) - BUS grant (£7,500 for heat pump — combine with solar) - ECO4 scheme (free measures for qualifying low-income households)

Wales-specific support:

Nest scheme: - Welsh Government energy efficiency programme - Provides free home energy improvements to qualifying households - Eligibility: means-tested benefits OR living in a low-EPC home in a deprived area - Measures include: insulation, boiler replacement, and in some cases solar panels - Apply through nestwales.org.uk or call 0808 808 2244

Warm Homes Programme (Arbed): - Area-based scheme targeting fuel poverty in Welsh communities - Free external wall insulation, heating upgrades, and sometimes solar - Not means-tested — based on area eligibility - Check if your area qualifies through your local authority

Welsh Government Renewable Energy Loans: - Interest-free loans for renewable energy installations - Currently focused on community and public sector projects - Check Business Wales for any residential schemes

Source: Welsh Government energy policy; Nest scheme; Arbed programme.

Wales has its own planning regulations, slightly different from England:

Permitted development (no planning needed): - Same conditions as England — panels not protruding >200mm, not above ridge line - Conservation area rules similar to England (highway-facing may need permission) - National Park restrictions: Brecon Beacons (Bannau Brycheiniog), Snowdonia (Eryri), and Pembrokeshire Coast may have additional requirements

Key Welsh difference: - Wales uses the Town and Country Planning (General Permitted Development) (Amendment) (Wales) Order - The conditions are broadly aligned with England but not identical - Check with your local planning authority if you are in a sensitive area

Listed buildings: - Cadw (the Welsh heritage body) equivalent to Historic England - Listed building consent required for all external alterations - Process is similar to England

Building regulations: - Wales uses Part P (same as England) for electrical work - MCS-certified installers self-certify Part P compliance

Source: Welsh Government planning guidance; Cadw heritage standards.

Solar installers operating in Wales should provide: - Bilingual documentation where possible - Welsh-language customer service if requested - Compliance with the Welsh Language Standards (for larger companies)

This does not affect the technical installation but is worth knowing if you prefer Welsh-language communication. Many Wales-based MCS installers offer bilingual service.

Source: Welsh Language Commissioner standards.