solar panels for schools in Cardiff

Why solar panels make sense for Cardiff schools

Cardiff runs one of the largest school estates in Wales. As the Welsh capital, Cardiff Council maintains a broad network of primary, secondary and special schools, delivered bilingually across English-medium and a growing Welsh-medium (cyfrwng Cymraeg) sector, and serving a young, fast-growing city population. Alongside the community and voluntary schools sit a small number of academy-style and faith settings, a substantial post-16 offer through Cardiff and Vale College and the sixth forms, and three universities in Cardiff University, Cardiff Metropolitan University and the wider higher-education presence. Almost all of these schools have absorbed electricity cost rises of 60–120% since 2021 with no matching rise in the funding that flows through the Welsh Government’s local-authority settlement.

That combination — a big bilingual estate under a devolved education and funding system, and steep energy inflation — is exactly why school solar has become a standing item on estates strategies across Cardiff. A typical Cardiff secondary now spends £80,000–£150,000 a year on grid electricity; a large school or college with heavy IT and catering load can spend more. Solar PV is one of the very few capital measures that pays itself back inside a normal estates horizon, and in Wales it also aligns directly with a devolved net-zero ambition that is more demanding of the public sector than the equivalent English targets.

Wales’ net-zero-by-2030 public-sector ambition and what it means for your school

This is where a Cardiff school differs most from an English one, and it works in your favour. The Welsh Government has set an ambition for the Welsh public sector to be net zero by 2030 — two decades ahead of the UK-wide 2050 statutory deadline, and applied through devolved policy rather than the DfE strategy that governs English schools. Cardiff Council’s own One Planet Cardiff strategy carries the same 2030 direction of travel. On-site renewables sit at the heart of how Welsh schools are expected to hit that ambition. For a Cardiff school that matters in three practical ways.

First, planning in Wales operates under Welsh regulations, and rooftop solar PV is permitted development for most school buildings under the equivalent provisions of the Town and Country Planning (General Permitted Development) Order as it applies in Wales, so the majority of installs need no planning application at all. Second, Cardiff has a rich stock of Victorian board schools and church schools, particularly in Canton, Grangetown and the older suburbs, and these can sit in conservation areas or carry listed status, in which case listed building consent from the local planning authority under Welsh heritage rules (administered with Cadw’s guidance) may be needed. Third, for a school reporting to its governing body, a solar project is clean, auditable evidence of progress against the Welsh Government’s 2030 public-sector net-zero ambition — useful for both governing-body reporting and Welsh Government returns.

The Cardiff school roof — and the term-time problem

Cardiff schools span the full range of roof types. Victorian and church schools in Canton, Grangetown, Roath and the older suburbs carry pitched slate roofs and heritage sensitivities, while post-war and modern primaries across Llanishen, Pentwyn and the northern and eastern growth areas are single-storey with simple roofs ideal for a 30–70 kW array. The larger secondaries and the newer 21st Century Schools and Sustainable Communities for Learning buildings offer sports halls, science blocks and main teaching buildings that comfortably take 100–250 kW across several roof planes — and many of the newest Cardiff schools were designed to strong energy-efficiency standards, so PV integrates cleanly.

Whatever the roof, a Cardiff school’s demand curve creates the same design challenge we see across the sector: generation peaks in July and August, during the summer holiday, when the building is closed, and again at weekends. Size a system off the roof area alone and a non-boarding Cardiff school will self-consume only 35–55% of what it produces. The specialist’s job is to size instead from at least twelve months of your half-hourly meter data including a holiday period, then close the gap with a modest battery (50–150 kWh) that shifts holiday and weekend generation into term-time use, the Smart Export Guarantee to monetise the rest, and low-cost public-sector finance so the project stands up regardless of self-consumption.

Funding a Cardiff school solar project

Funding in Wales works differently from England, and it is important to get this right: the English schemes — the Condition Improvement Fund, the Public Sector Decarbonisation Scheme and the current Salix rounds — do not apply to Welsh schools. Cardiff schools decarbonise through devolved Welsh routes instead:

• The Welsh Government Energy Service provides technical support, project development and, historically, access to interest-free invest-to-save loans for public-sector energy projects — the closest Welsh equivalent to the interest-free finance English schools use, structured so repayments come from the energy savings.
• Interest-free public-sector loan funding administered through Welsh Government programmes (Salix has historically administered interest-free loan schemes in Wales on the Welsh Government’s behalf) can cover the capital, repaid from the saving so the project is cash-flow positive.
• Local authority prudential borrowing lets Cardiff Council borrow against the future energy saving to fund school PV directly as part of its estate programme.
• The Smart Export Guarantee (SEG) applies UK-wide and monetises the holiday and weekend export that a term-time school produces — a genuine income line in the Welsh business case.

We map the right combination of Welsh Government and local-authority routes for your specific status and write the auditable energy-savings calculation these programmes require, so the school business manager’s job is to sign the form rather than build the model. Independent schools in and around Cardiff fund from reserves and still benefit from the Smart Export Guarantee.

Local cost data — what Cardiff schools actually pay

For a Cardiff school rooftop solar installation in 2026, indicative cost per kW is:

• £900–£1,200 per kW for systems below 100 kW (typical primary and small secondary)
• £750–£950 per kW for systems of 100–500 kW (typical secondary, college or flagship building)

A worked primary example: a 48 kW system on a single-storey Cardiff primary sits around £46,000–£58,000 before any funding, generates roughly 43,000 kWh a year, and — under a Welsh Government interest-free loan repaid from the saving — is cash-flow positive from the first term. A worked secondary example: a 200 kW array on a larger Cardiff secondary or a Sustainable Communities for Learning building falls in the £150,000–£190,000 range, generates around 180,000 kWh, and pays back in roughly 6.5 years, faster still where prudential borrowing or Welsh Government funding covers part of the capital at low cost. Smart Export Guarantee tariffs available to Cardiff schools from suppliers such as Octopus Outgoing and E.ON Next Export Exclusive currently sit between 8 and 15p/kWh — a useful contribution across the long summer export period.

Cardiff’s distribution network operator is National Grid Electricity Distribution (South Wales) (formerly Western Power Distribution). Systems under 17 kW per phase connect quickly under G98; larger school arrays need a G99 application, where the technical study runs to around 45–65 working days and the connection offer plus any reinforcement can push the total to several months on busier parts of the South Wales network. We submit the G99 immediately after the structural survey so the DNO clock starts early — it is usually the longest single item in the timeline, not the install itself.

A representative Cardiff school install

A representative recent project: a 100 kW rooftop system commissioned on a Cardiff secondary school. The main teaching block and sports hall offered around 650 m² of usable roof across two planes; annual electricity consumption before the install had risen above 500,000 kWh, with a bill north of £110,000. The system comprises around 185 panels feeding the building’s existing three-phase supply.

First-year generation reached roughly 92,000 kWh. Because the school runs a busy daytime IT and catering load in term time, self-consumption held around 65% even without a battery; the summer-holiday surplus exported under SEG. Annual savings came in near £20,000, funded through a Welsh Government interest-free public-sector loan supported by local-authority prudential borrowing, and cash-flow positive from the outset. The school added a live-generation display to the main hall, now used in GCSE Geography, and the local authority has since scoped its remaining schools from the same feasibility study — the pattern we see again and again once the first project lands.

Cardiff and South Wales schools we can reach

We deliver school solar across all the Cardiff postcode districts and the surrounding South Wales towns. Most Cardiff schools are within reach of our nearest crews for same-day site visits and rapid response on commissioning. Beyond the city we work with schools and academy trusts across Penarth, Caerphilly, Barry, Newport and Pontypridd, and out towards Swansea and the wider South Wales valleys — a spread where a single local authority or diocese often runs schools across several sites. Schools and academy trusts across Cardiff and South Wales can also call on FLD Solar and Electrical, an NICEIC-approved, MCS-certified Swansea firm experienced in education-sector solar and electrical work. A school group operating across South Wales gets consistent installation quality, safeguarding and reporting from a single specialist rather than a different contractor in every valley town.

Whether you run a Victorian primary school in Canton or Grangetown or a modern secondary school built to the latest Welsh standards, the feasibility study starts from the same place: your meter data and your roof.

Frequently asked questions about Cardiff school solar

Does Cardiff get enough sun for a school solar project to pay? Yes. Despite its reputation for rain, Cardiff enjoys reasonable solar irradiance, and a 100 kW school array here generates roughly 88,000–92,000 kWh a year. School economics depend far more on tariff levels, self-consumption and low-cost Welsh Government or prudential funding than on peak sunshine hours.

What funding can a Cardiff school use — is it the same as English schools? No, and it’s important to know the difference. The English CIF, PSDS and current Salix rounds do not apply in Wales. Cardiff schools use devolved routes: the Welsh Government Energy Service, interest-free public-sector loan funding administered through Welsh Government programmes, and local-authority prudential borrowing, all repaid from the energy saving. The UK-wide Smart Export Guarantee adds export income on top. We map the right combination for your school.

How long does National Grid take to connect a Cardiff school system? Under 17 kW per phase, G98 connections are quick and can be self-certified. Above that, expect a G99 technical study of around 45–65 working days followed by a connection offer; on busier parts of the South Wales network, reinforcement can push the total to several months. We start the application straight after the structural survey so the network clock runs in parallel with funding.

Are your crews cleared to work in a Cardiff school? Every operative is DBS-cleared to Enhanced level including the Children’s Barred List, refreshed annually, and we work to safeguarding standards equivalent to KCSIE and to the Welsh statutory safeguarding guidance — governing-body induction, escorted access in pupil areas, sign-in/out. Disruptive works are scheduled for the school holidays, with the exam window kept clear for GCSE and A-level year groups.

Get a free quote for your Cardiff school

We’ve scoped and delivered solar PV for schools across Cardiff and the wider South Wales region. Every quote starts with a free desk-based feasibility study from your half-hourly meter data and roof drawings — no site visit needed for the initial proposal. Within seven working days you’ll have an indicative system size, generation forecast, savings estimate, a view on the right Welsh Government or local-authority funding route for your status, and an honest cost breakdown. If the numbers don’t work for your roof, we’ll tell you plainly.