Specialist solar panels for schools in Builth Wells

Solar PV for academy trusts across Powys

A one kilowatt-peak array on a shallow pitched roof in Builth Wells models at 830 kWh a year, from modelled irradiation of 1,060 kWh per square metre in the plane of the array (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is about 6 percent below the mean across the towns we cover, so the case at this latitude rests almost entirely on using the output on site rather than exporting it.

Scaled up, a 320 kWp array, sized to what the nearest school scheme on record applied for, 59 miles away at Weston-super-Mare, models at about 265,600 kWh a year before shading, and needs roughly 950 square metres of clear roof. We take the size from the nearest real application rather than a round number, so the example is anchored to something a planning officer has already seen.

Spread across the year that is about 67,500 kWh landing in July and August and roughly 12,000 kWh across December and January. National Grid Electricity Distribution sets what may go back onto the network here, so the July figure is the one worth putting in front of a governing body first.

The planning position for Builth Wells schools

No school or college solar scheme appears in Builth Wells and the area around it in the Renewable Energy Planning Database. That is a reporting threshold rather than a verdict. The database records generating stations from one megawatt upward reliably and smaller ones patchily, and almost every school array is a fraction of that, so a roof full of panels on a Builth Wells secondary could be generating today without ever reaching it.

The closest recorded one is about 59 miles away at Weston-super-Mare: Weston College, a 300 kWp roof mounted array applied for by Weston College, which holds consent and is awaiting construction. We were not involved in it. We cite it because it is a public record of what has cleared planning in this part of Somerset. Source: Renewable Energy Planning Database, Q1 2026.

Why demand in Builth Wells falls as the roof peaks

The generating year and the school year are out of step in Builth Wells. July and August carry 25.4 percent of the modelled output (EU PVGIS v5.2), and the site is closed for most of those nine weeks. May is the strongest single month here at 14 percent of the annual total, which is still term time, and that works slightly in your favour against towns whose curve peaks in July.

At the other end of the year the mismatch flips. Only 4.5 percent of output falls in December and January, the two months when a Builth Wells school is fully occupied and its heating and lighting are at their heaviest. The roof makes 6.8 times as much in May as it does in December, and August alone outproduces December by about 5.7 to one. 75 percent of the year arrives between April and September, and the point of that figure is not that the summer half goes unused, because April, May and June are full teaching months that draw hard. It is that the concentration peaks in the few weeks at the end of it when the building is shut.

Nationally this comes out at about 49 percent of annual generation falling on a session day. A business open every weekday sees roughly 71 percent. The 22 point gap is what a school appraisal has to absorb, and it is much the same in Builth Wells as anywhere else.

The daily curve does the same thing in miniature. Load drops sharply after about three o'clock, generation does not, so the last three hours of a summer afternoon are pushing into an empty building unless something absorbs them. Half hourly meter data is the only way to see how much.

The conclusion is not that a Builth Wells school should do nothing. It is that the array should be sized to the load that survives the holidays, which is usually the server room, the catering refrigeration, the ventilation and the hot water, plus whatever the site lets out over the summer. Anything above that line needs storage or an export agreement with National Grid Electricity Distribution to earn its keep.

We set out the full treatment of the school year against the generation curve on the home page, and what it does to a payback figure under costs.

Grid connection through National Grid Electricity Distribution

Connections around Builth Wells are handled by National Grid Electricity Distribution, which sets the export limit for the site. Above 3.68 kW per phase the connection runs under G99, so the export limit is agreed in advance rather than assumed. Where the local network is constrained, an export-limited connection usually still makes the scheme work, because a school uses most of what the roof makes during the working day.

Across Powys the planning database records 18 solar schemes totalling 39 MW, of which 1 are operational (REPD Q1 2026).

What Builth Wells trusts ask before a survey

How much would a school roof near Builth Wells generate?

Modelled at 830 kWh per kWp a year, a 320 kWp array on a Builth Wells school models at about 265,600 kWh. What decides whether that is worth doing is how much of it the school uses itself, not the total. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

How does the school year affect a solar scheme in Builth Wells?

It goes somewhere, just not into the timetable. 25.4 percent of the Builth Wells generating year lands in July and August (EU PVGIS v5.2), and a closed school still runs servers, comms, refrigeration and ventilation. What that base load does not absorb is either stored, exported under an agreement with National Grid Electricity Distribution, or a sign the array is too big. We test which before sizing anything.

Which network operator handles the connection at a Builth Wells school?

Applications go to National Grid Electricity Distribution, who run the network across Powys. An export-limited offer usually still works for a school, because the summer surplus is the part you were least likely to be paid much for anyway.