Specialist solar panels for schools in Grantham
A kilowatt-peak on a Grantham school roof models at 886 kWh a year, above the mean across the towns we cover, and the roofs it applies to are mostly carrying nothing. The survey records sheet type, remaining life, purlin spacing and the state of the incoming supply, and the model runs off your own meter data rather than an average.
886 kWh per kWp a year at this latitude, so a 280 kWp array, the median size on the national planning record, models at about 248,100 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Grantham- 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.
Solar PV for academy trusts across Lincolnshire
A one kilowatt-peak array on a shallow pitched roof in Grantham models at 886 kWh a year, from modelled irradiation of 1,130 kWh per square metre in the plane of the array (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That sits within a few percent of the mean across the towns we cover, so what decides the scheme is the school's own demand pattern rather than where in the country it stands.
Scaled up, a 280 kWp array, sized to the median array applied for at schools on the national planning record, models at about 248,100 kWh a year before shading, and needs roughly 832 square metres of clear roof. We use the national median from the planning record rather than a round number, so the example stays anchored to what schools have applied for.
Spread across the year that is about 63,500 kWh landing in July and August and roughly 12,200 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.
Grantham ranks 6 of 8 towns we cover in Lincolnshire on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 861 to 906, a spread of 45 kWh per kWp. On a 500 kWp array that is about 22,500 kWh a year between the strongest and weakest town in the county.
The planning position for Grantham schools
The Renewable Energy Planning Database holds no school scheme for the NG31 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 closest recorded one is about 20 miles away at West Bridgford: Rushcliffe School, Boundary Road, a 0 kWp roof mounted array applied for by Private Developer, which is with the planning authority. We were not involved in it. We cite it because it is a public record of what has cleared planning in this part of Nottinghamshire. Source: Renewable Energy Planning Database, Q1 2026.
Why demand in Grantham falls as the roof peaks
The generating year and the school year are out of step in Grantham. July and August carry 25.6 percent of the modelled output (EU PVGIS v5.2), and the site is closed for most of those nine weeks. July is the single strongest month here at 13.8 percent of the annual total, and it falls almost entirely inside the holiday.
At the other end of the year the mismatch flips. Only 4.9 percent of output falls in December and January, the two months when a Grantham school is fully occupied and its heating and lighting are at their heaviest. The roof makes 6.1 times as much in July as it does in December, and August alone outproduces December by about 5.3 to one. 74 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 Grantham changes that ratio much, but plenty about your own site changes what to do with it.
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.
A Grantham 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 complete version of the term time arithmetic 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 | 23 | 15 | 8 |
| Feb | 15 | 37 | 20 | 17 |
| Mar | 21 | 73 | 49 | 24 |
| Apr | 12 | 104 | 42 | 62 |
| May | 17 | 121 | 66 | 55 |
| Jun | 21 | 119 | 83 | 36 |
| Jul | 11 | 122 | 43 | 79 |
| Aug | 0 | 105 | 0 | 105 |
| Sep | 20 | 82 | 55 | 27 |
| Oct | 17 | 50 | 27 | 23 |
| Nov | 21 | 29 | 20 | 9 |
| Dec | 15 | 20 | 10 | 10 |
| Year | 190 | 885 | 430 | 455 |
The school estate in South Kesteven
South Kesteven has 67 open state-funded schools and colleges on the DfE register teaching 21,377 pupils between them. Source: DfE Get Information About Schools.
The split is 53 primary, 10 secondary, 3 special and 1 further education, at an average of 319 pupils a site. That is 5.3 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 National Grid Electricity Distribution
National Grid Electricity Distribution operates the distribution network across Lincolnshire, 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 Lincolnshire the planning database records 226 solar schemes totalling 7052 MW, of which 37 are operational (REPD Q1 2026).
Send us the school postcode
The first survey answers three questions at once: what the roofs carry, what they generate against your own timetable, and how a Grantham 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.
What Grantham trusts ask before a survey
- What would a 280 kWp array produce at a Grantham school?
- Yes, and the figure matters more than the sunshine. 886 kWh per kWp a year puts a 280 kWp array at around 248,100 kWh, on roughly 832 square metres of roof. The value of that depends on your term time load. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- What happens to the electricity during the summer holidays in Grantham?
- Less is wasted than governors expect, but the figure is worth seeing: 25.6 percent of the year is modelled to arrive in July and August here (EU PVGIS v5.2), against a site running on holiday base load. Lettings, holiday clubs and summer works take some of it, storage takes more, and the rest is an export question for National Grid Electricity Distribution.
- Who do we apply to for export near Grantham?
- Only National Grid Electricity Distribution can answer it for your connection. What we can say is that a capped export limit rarely breaks a school scheme, because the array that suits a school is sized to the term time load rather than to the roof.
- Do we need planning permission in South Kesteven?
- Often not, because panels on the roof of a school building usually sit within permitted development for non-domestic buildings. The exceptions are listed buildings, conservation areas and arrays that project too far above the roof plane, and larger schemes still need prior approval from South Kesteven. We confirm it either way.
- How many schools are there around Grantham?
- South Kesteven has 67 open state-funded schools and colleges on the DfE register, with 21,377 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.