Specialist solar panels for schools in Chippenham
Wiltshire College, Lackham sits on the planning record near Chippenham at 320 kWp, which makes the question here less whether a school roof works and more what yours would carry. We start with the roof build up and the age of the covering, because across a school estate that is usually what decides which block goes first.
286,100 kWh a year, modelled for a 320 kWp array on roughly 950 sqm of clear roof. That is the median size schools around Chippenham have applied for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Chippenham- 1 teaching block
- 2 hall and kitchen
- 3 sports hall
- 4 1960s block, no array
- first phase
- later phase
Illustrative layout for an estate of this size. The array is drawn at about 345 kWp, roughly 53 percent of the 650 kWp these three roofs would hold, because a school sizes to the load it can use in term time rather than to the roof it has: generation it cannot use is exported at a much lower rate than it pays to import. The hatched block carries no array because its structure has not been assessed, which on a school of that era is the usual starting point rather than an exception. Your own figures, and which of your blocks can take an array, come from the roof survey.
Which schools around SN15 have applied
The Renewable Energy Planning Database records 1 school and college solar scheme in the SN15 postcode district. A college, Wiltshire College, Lackham, applied for 320 kWp roof mounted and the scheme holds consent and is awaiting construction. The applicant on record is Wessex Energy Solutions.
None of these are ours. They are entries in the public planning record, reproduced here because a consented array at a school down the road is a better guide to your own prospects than any national average. Source: Renewable Energy Planning Database, Q1 2026.
One thing to be clear about: the drawing at the head of this page is an illustrative estate, not Wiltshire College, Lackham and not a survey of anyone's roof. What we know about the scheme above is only what the public planning record says.
The median array applied for here is 320 kWp. At 320 kWp you are covering roughly 950 square metres of roof once walkways, edge zones and rooflight setbacks come out, which on most sites means a sports hall plus one teaching block rather than the whole estate.
Every one of them is a college, which is worth knowing: a college runs longer days and more plant than a school, and it usually has the flat roof area to match.
| Site on record | Applicant on record | Size | Mounting | Status |
|---|---|---|---|---|
| Wiltshire College, Lackham | Wessex Energy Solutions | 320 kWp | Roof | Awaiting Construction |
Solar for education buildings across Wiltshire
A one kilowatt-peak array on a shallow pitched roof in Chippenham models at 894 kWh a year, from modelled irradiation of 1,144 kWh per square metre in the plane of the array (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is within a few percent of our mean. Latitude is not the variable here. When the building is occupied is.
Scaled up, a 320 kWp array, sized to the median array applied for at schools around Chippenham itself, models at about 286,100 kWh a year before shading, and needs roughly 950 square metres of clear roof. That size is not one we chose. It is what schools in this district have actually applied for.
Spread across the year that is about 73,000 kWh landing in July and August and roughly 14,900 kWh across December and January. Scottish and Southern Electricity Networks 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.
Chippenham ranks 8 of 8 towns we cover in Wiltshire on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 894 to 923, a spread of 29 kWh per kWp. Within Wiltshire that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.
Term dates against the Chippenham generation curve
A Chippenham school roof generates most in the weeks its buildings are closed. 25.5 percent of the modelled year lands in July and August alone (EU PVGIS v5.2), and the summer holiday takes roughly six of those nine weeks out of the timetable. July is the single strongest month here at 13.9 percent of the annual total, and it falls almost entirely inside the holiday.
Winter reverses it. December and January between them return 5.2 percent of the modelled year, and that is when the heating, the lighting and a full register are all drawing at the same time. The roof makes 5.9 times as much in July as it does in December, and August alone outproduces December by about 5 to one. 73 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.
Put the two calendars together and roughly 49 percent of a school's generation nationally lands on a session day, against about 71 percent for a business open every weekday. That gap is the whole difference between appraising a school roof and appraising any other commercial one, and it barely moves from town to town.
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.
None of that makes a Chippenham scheme a bad one. It changes what the scheme should be: sized against the base load that runs whether or not the school is open, which on most sites is servers, comms, catering refrigeration, ventilation and hot water, with lettings, holiday clubs and summer works added on top. Where that base load is thin, the choices are storage, an export arrangement through Scottish and Southern Electricity Networks, or a smaller array that consumes nearly everything it makes.
We set out the whole argument about term dates and the generation curve on the home page, and what it does to a payback figure under costs.
- generated while the school is open
- generated at a weekend or in the holidays
The same figures as a table
| Month | Session days | Output, kWh per kWp | School open | School closed |
|---|---|---|---|---|
| Jan | 20 | 25 | 16 | 9 |
| Feb | 15 | 38 | 20 | 18 |
| Mar | 21 | 73 | 49 | 24 |
| Apr | 12 | 104 | 42 | 62 |
| May | 17 | 121 | 66 | 55 |
| Jun | 21 | 122 | 85 | 37 |
| Jul | 11 | 124 | 44 | 80 |
| Aug | 0 | 104 | 0 | 104 |
| Sep | 20 | 81 | 54 | 27 |
| Oct | 17 | 50 | 27 | 23 |
| Nov | 21 | 30 | 21 | 9 |
| Dec | 15 | 21 | 10 | 11 |
| Year | 190 | 893 | 434 | 459 |
Grid connection through Scottish and Southern Electricity Networks
Connections around Chippenham are handled by Scottish and Southern Electricity Networks, 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 Wiltshire the planning database records 159 solar schemes totalling 1585 MW, of which 56 are operational (REPD Q1 2026).
Wiltshire schools, phase by phase
Wiltshire has 237 open state-funded schools and colleges on the DfE register teaching 68,445 pupils between them. Source: DfE Get Information About Schools.
The split is 201 primary, 28 secondary, 6 special and 2 further education, at an average of 289 pupils a site. That is 7.2 primaries for every secondary, which is the ratio that matters for a roof: a primary of a few hundred pupils usually offers a hall roof and one teaching block, while a secondary site carries a sports hall, a dining block and several flat roofs.
If your trust holds several of them, the sequencing question comes before the sizing question. Roof age, covering type and the state of the incoming supply vary block by block across an estate, and that is normally what sets the order of works.
Book a roof survey at your Chippenham school
Lenzie Consulting Ltd arranges roof surveys for schools across Wiltshire. Send the school postcode and a rough idea of the roof area, and the last twelve months of half hourly meter data if the school holds it. We come back with what the roofs can carry, what they would generate against your own consumption, and the funding routes open to a school.
Lenzie Consulting Ltd arranges the survey and passes your details to an MCS-certified installation partner so they can quote. We do not carry out the installation ourselves.
Chippenham school solar, answered
- Is there enough sun around Chippenham for this to be worth doing?
- The model gives 894 kWh a year for every kWp installed at this latitude, so a 320 kWp array comes out at roughly 286,100 kWh a year before shading. It needs about 950 square metres of clear roof once walkways and rooflight setbacks are allowed for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- Does a Chippenham school waste its generation in August?
- 25.5 percent of the modelled annual output for Chippenham falls in July and August, when the buildings are closed for most of six weeks (EU PVGIS v5.2). It does not go to waste, but it only has three places to go: the base load that runs regardless, such as servers, catering refrigeration and ventilation; storage; or export under an agreement with Scottish and Southern Electricity Networks. We model all three against your half hourly data before an array is sized.
- Will the network around Chippenham accept the export?
- Scottish and Southern Electricity Networks is the distribution network operator for Wiltshire. Anything above 3.68 kW per phase connects under G99, and the application fixes the export limit. On a school site the incoming supply is often the binding constraint rather than the roof, so we ask that question before anyone sizes an array.
- Is planning permission needed for panels on a school in Chippenham?
- Usually permitted development covers a roof array on a school, with prior approval from Wiltshire needed above a capacity threshold. A ground mounted array in the grounds is a different question and much more likely to need a full application. We check both before design sign-off.
- Has a school near SN15 already done this?
- One school scheme is on record in this postcode district, including a 320 kWp array at Wiltshire College, Lackham that holds consent and is awaiting construction. We were not involved in it. It is a public planning record, and it matters less as proof that solar works than as evidence of what this authority and this network operator have already accepted. Source: Renewable Energy Planning Database, Q1 2026.
- How many schools are there around Chippenham?
- Wiltshire has 237 open state-funded schools and colleges on the DfE register, with 68,445 pupils on roll. Source: DfE Get Information About Schools. We survey across the whole of that area, and where a trust holds several sites we look at them in one pass.