Solar panels in Cwmbran

Cwmbran sits in the Torfaen council area, where the 2021 Census counted 92,276 residents. Solar Cymru is an independent guide and enquiry-referral service for Welsh homeowners. We do not install panels ourselves. Instead, we pass your enquiry to MCS-certified installers who work in your area.

This page covers what a Cwmbran roof can expect from solar. It looks at yield, planning, grid rules and cost. Every figure comes from a published source, and the sources sit at the foot of the page.

What a Cwmbran roof can produce

PVGIS is the European Commission’s solar modelling tool. It gives about 1,000 kWh a year for each kWp on a south-facing roof at 35 degrees in Cwmbran. A 4 kWp system therefore makes about 4,000 kWh a year on that basis. However, the model assumes 14% system losses and knows nothing about your chimney or your neighbour’s tree.

Orientation and shade matter more than the town you live in. A roof facing east or west makes about 15 to 20% less than one facing south. Our guide to solar yield in Wales explains how installers estimate both. Ask for the MCS performance estimate, because it states the orientation, pitch and shade factor in a set format.

Planning in Torfaen

Panels on the roof of a house in Wales usually count as permitted development, so you often need no planning permission. The panels must not stand more than 200 mm proud of the roof slope. They must also stay below the highest part of the roof, not counting any chimney.

Torfaen has an unusual map, because part of the borough lies inside Bannau Brycheiniog National Park. The National Park Authority plans that land, while the council keeps its other services. The Welsh domestic rules do not name national parks, yet you should still ask the authority before you commit. Start with the authority’s own planning pages.

Torfaen also holds part of the Blaenavon Industrial Landscape World Heritage Site, inscribed in 2000. In a World Heritage Site or a conservation area, panels on a wall that fronts a highway need planning permission. Cadw’s data records 6 conservation areas in the borough outside the national park. The council publishes a design guide for the Blaenavon area, and our planning permission guide for Wales covers the wider rules.

Grid connection and selling spare power

National Grid Electricity Distribution runs the South Wales licence area, which stretches from Pembrokeshire to Monmouth. Cwmbran falls inside that stated geography, but check your address with the Energy Networks Association operator finder. A single-phase system with an inverter up to 3.68 kW follows the G98 route. Your installer then notifies the network operator within 28 days of commissioning.

Larger systems follow G99, and the operator must agree the connection first. Meanwhile, the Smart Export Guarantee pays you for surplus power. Ofgem’s 2024-25 report found an average near 4.4p per kWh on untied tariffs, so compare offers using our Smart Export Guarantee explainer.

Roofs, slate and electric cars

If your roof has slate, ask how the installer will fix the brackets. MCS rules say brackets must not load the slates unless a certified design spreads the weight. Our article on fitting panels to slate roofs lists the questions to put to an installer.

Daytime charging suits solar well. For example, you can charge an electric car while the panels generate, which cuts running costs. Read how to plan that in charging an electric car with solar.

Costs and funding for Cwmbran homes

A typical 4.5 kWp home system uses around 12 panels. DESNZ cost data and the Energy Saving Trust together support roughly £6,500 to £8,800 for that size. A battery adds about £2,000 to £10,000, with £5,000 to £8,000 typical. VAT on home installations is 0% until 31 March 2027, then due to rise to 5% unless the law changes.

Households typically save around £450 to £500 or more a year, depending on how much power they use themselves. Funding is limited. Warm Homes Nest helps eligible low-income households, and Green Homes Wales offers interest-free loans of £1,000 to £25,000 to owner-occupiers. Our solar funding guide for Wales sets out the rules.

Getting quotes from MCS-certified installers

Start with our solar panel installation service page and then send one enquiry through the quote form. We refer it to MCS-certified installers, and you compare their written designs. Our guide to choosing an installer lists what a good quote contains.

Border homes may want to read the neighbouring pages too. They cover solar installers around Newport, solar quotes near Caerphilly and panels for Abergavenny homes. Each page lists its own planning and grid facts.