Specialist solar panels for schools in Chester-le-Street
A school roof in Chester-le-Street makes 7.9 times as much in May as it does in December, and the school year runs against that curve rather than with it. What we come back with is the usable roof area, the modelled output against your meter data, and the routes schools use to pay for it.
26.2% of the modelled year lands in July and August, on a roof that returns 821 kWh per kWp a year. The worked example below runs at 270 kWp, the median size schools across County Durham have applied for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Chester-le-Street- 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.
School rooftop solar across County Durham
A one kilowatt-peak array on a shallow pitched roof in Chester-le-Street models at 821 kWh a year, from modelled irradiation of 1,046 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 7 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 270 kWp array, sized to the median array applied for at schools across County Durham, models at about 221,700 kWh a year before shading, and needs roughly 802 square metres of clear roof. We use that size because it is what schools across County Durham have applied for, not because it suits the arithmetic.
Spread across the year that is about 58,100 kWh landing in July and August and roughly 9,100 kWh across December and January. Northern Powergrid 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.
Chester-le-Street ranks 3 of 6 towns we cover in County Durham on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 811 to 845, a spread of 34 kWh per kWp. Within County Durham that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.
What the planning record shows around Chester-le-Street
The Renewable Energy Planning Database holds no school scheme for the DH3 postcode district. Read that as a gap in the record, not a gap in the roofs: the database is reliable above one megawatt and thin below it, and a school array is typically a fifth of a megawatt.
The nearest education scheme on the record is 5 miles from Chester-le-Street, at Durham: 0 kWp at Collingwood College, South Road, applicant Howarth Litchfield Partnership, which holds consent and is awaiting construction. That is someone else's application, not ours, and it is here because it shows what County Durham planning has already accepted at an education site. Source: Renewable Energy Planning Database, Q1 2026.
The summer holiday problem for a Chester-le-Street school
26.2 percent of the annual output modelled for Chester-le-Street arrives in the two months a school uses least (EU PVGIS v5.2). Term ends in the third week of July and the buildings stay largely empty until September. May is the strongest single month here at 14.5 percent of the annual total, which is still term time, and that works slightly in your favour against towns whose curve peaks in July.
The inverse holds at the other end. December and January together return only 4.1 percent of the year, and those are the months with the heating, the lighting and the full timetable all running at once. The roof makes 7.9 times as much in May as it does in December, and August alone outproduces December by about 6.5 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.
Summed over the year, about 49 percent of what a school roof makes arrives while the school is open. For a business trading every weekday the equivalent is roughly 71 percent. Nothing about Chester-le-Street changes that ratio much, but plenty about your own site changes what to do with it.
Daily shape compounds it. A school's load climbs from breakfast club, holds through the teaching day and falls away from about three in the afternoon, while generation is still strong until six in high summer. That is why we size against half hourly meter data rather than against annual consumption: the annual figure hides both problems.
A Chester-le-Street governing body should read that as a sizing constraint, not a reason to stop. The base load that runs through the holidays, servers, comms, refrigeration, ventilation and hot water, is the floor the array should be built up from, and everything above it has to be justified by storage, export or summer occupancy.
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.
- 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 | 19 | 12 | 7 |
| Feb | 15 | 34 | 18 | 16 |
| Mar | 21 | 67 | 45 | 22 |
| Apr | 12 | 98 | 39 | 59 |
| May | 17 | 119 | 65 | 54 |
| Jun | 21 | 112 | 78 | 34 |
| Jul | 11 | 117 | 42 | 75 |
| Aug | 0 | 98 | 0 | 98 |
| Sep | 20 | 75 | 50 | 25 |
| Oct | 17 | 44 | 24 | 20 |
| Nov | 21 | 24 | 17 | 7 |
| Dec | 15 | 15 | 7 | 8 |
| Year | 190 | 822 | 397 | 425 |
How many schools County Durham has
County Durham has 262 open state-funded schools and colleges on the DfE register teaching 69,907 pupils between them. Source: DfE Get Information About Schools.
The split is 218 primary, 30 secondary, 9 special and 5 further education, at an average of 267 pupils a site. That is 7.3 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.
Grid connection through Northern Powergrid
Northern Powergrid operates the distribution network across County Durham, so the export application goes to them. Anything larger than 3.68 kW per phase falls under G99, which means an application before commissioning rather than a notification afterwards. A constrained network is not the end of a scheme. Capping export costs little when the building already absorbs most of what the roof produces.
Across County Durham the planning database records 85 solar schemes totalling 1168 MW, of which 9 are operational (REPD Q1 2026).
Start with the Chester-le-Street roof
The first survey answers three questions at once: what the roofs carry, what they generate against your own timetable, and how a Chester-le-Street school pays for it. Send the postcode, an approximate roof area per block and half hourly meter data if the school can get it from its supplier.
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.
Questions governors ask us about Chester-le-Street schools
- How much would a school roof near Chester-le-Street generate?
- Modelled at 821 kWh per kWp a year, a 270 kWp array on a Chester-le-Street school models at about 221,700 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 Chester-le-Street?
- It goes somewhere, just not into the timetable. 26.2 percent of the Chester-le-Street 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 Northern Powergrid, or a sign the array is too big. We test which before sizing anything.
- Which network operator handles the connection at a Chester-le-Street school?
- Applications go to Northern Powergrid, who run the network across County Durham. 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.
- What does County Durham require for solar on a school building?
- Roof-mounted solar on a non-domestic building often falls within permitted development under Part 14 of the General Permitted Development Order, subject to limits on how far the panels stand proud of the roof plane and, above a threshold, to prior approval from County Durham on siting and design. Listed buildings and conservation areas are the usual exceptions. We put the position to County Durham before a design is finalised.
- How many schools are there around Chester-le-Street?
- County Durham has 262 open state-funded schools and colleges on the DfE register, with 69,907 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.