Polytunnel Solar Panels in Cardiff

Why polytunnel solar makes economic sense around Cardiff

The farms around Cardiff run from Vale of Glamorgan dairy and mixed arable to upland sheep and beef in the valleys and the Brecon Beacons. The region's working farms — many tenanted from institutional landlords like Welsh Government rural estate plus National Trust Wales — typically run multi-building holdings with significant on-farm electrical demand. Polytunnel installations near Cardiff benefit from year-round daytime baseload that aligns well with PV generation: Heated glasshouses and protected horticulture have massive supplementary lighting and heating loads. What a particular building would save depends on its half-hourly electricity use, the tariff it pays and its export arrangement, so the figures come from the farm’s own bills rather than an area average; the farm solar cost guide shows how to build that estimate from the official DESNZ figures.

Typical polytunnel install specification for the Cardiff region

A representative polytunnel install for a working farm near Cardiff delivers around 100 kW of capacity across roughly 600 square metres of roof area. Agrivoltaic translucent-panel installs need agronomic trial alongside structural assessment. Polytunnel structural reinforcement often required for rooftop PV — typically frame upgrade or perimeter ground-mount alternative. Defra and NFU horticulture engagement increasing.

Cardiff-area planning and grid context

Polytunnel solar installations near Cardiff fall under the Welsh order, not the English one: Part 43 Class A of the Town and Country Planning (General Permitted Development) Order 1995 as it applies in Wales, subject to its conditions. The Wales section of planning permission for solar on farm buildings. The distribution network operator (DNO) is the company that owns the local network, set by the site’s location rather than the electricity supplier. It sets its own G99 study timescales and any reinforcement cost, so ask it for current figures in writing before relying on a programme; the process is covered in the guide to DNO grid connection for rural farm solar.

Polytunnel solar in Cardiff — key features

• Heated glasshouses and protected horticulture have massive supplementary lighting and heating loads
• Vertical farming and CEA sites exceptionally good PV fit
• Agrivoltaics over polytunnels emerging quickly (translucent panels, semi-shade-tolerant crops)
• Soft fruit, salads, ornamentals — supermarket-facing producers under Scope 3 pressure

Combined re-roof and PV for older Cardiff-area polytunnel buildings

Many buildings of this age carry asbestos cement sheets. Installers will not normally fix through them, so the roof is overclad or replaced before the panels go on. HSE says most work on asbestos cement is non-licensed provided the people doing it are informed, instructed and trained, and its task sheet A14 asks whether the sheets can be overlaid with non-asbestos material instead of removed. The options and what to ask for are in overclad or strip an asbestos cement farm roof, and the legal position is on solar panels on asbestos cement farm roofs.

What a feasibility study should cover for polytunnel solar in Cardiff

A project normally starts with a desk-based feasibility study from half-hourly meter data and building dimensions, which should give an indicative system size, generation forecast and self-consumption ratio before anyone visits. Ask each installer what the study includes, what it costs, who carries it out and what the structural and electrical survey covers. This site is independent guidance, not an installer: send your details through the quote form and we reply by email.

See more detail on our polytunnel solar page or our wider Cardiff farm-building solar coverage.