Specialist solar panels for schools in Colchester
What decides a solar scheme at a Colchester school is how much of the output the site uses itself, not how much the roof makes. We arrange the roof survey, model the output against the school's own half hourly consumption, and set out the funding routes.
209,700 kWh a year, modelled for a 220 kWp array on roughly 653 sqm of clear roof. That is the size applied for at the nearest school scheme on record. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Colchester- 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 for education buildings across Essex
A one kilowatt-peak array on a shallow pitched roof in Colchester models at 953 kWh a year, from modelled irradiation of 1,215 kWh per square metre in the plane of the array (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is around 8 percent above the mean across the towns we cover, which is about as strong as a UK school roof gets.
Scaled up, a 220 kWp array, sized to what the nearest school scheme on record applied for, 18 miles away at Felixstowe, models at about 209,700 kWh a year before shading, and needs roughly 653 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 53,500 kWh landing in July and August and roughly 10,300 kWh across December and January. UK Power 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.
Colchester ranks 2 of 10 towns we cover in Essex on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 908 to 973, a spread of 65 kWh per kWp. On a 500 kWp array that is about 32,500 kWh a year between the strongest and weakest town in the county.
School solar on record near CO1
There is no school entry for the CO1 postcode district in the Renewable Energy Planning Database. The register is dependable for anything from a megawatt upward and incomplete below it, and a school array is usually nearer a fifth of a megawatt, so this says more about the threshold than about Colchester.
Look 18 miles out and there is one: Felixstowe School, High Street in Felixstowe, 220 kWp, applied for by eEnergy, which holds consent and is awaiting construction. None of our doing. It is a public planning record, and the nearest evidence available of how an application like yours is treated around here. Source: Renewable Energy Planning Database, Q1 2026.
Term dates against the Colchester generation curve
A Colchester 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. June is the strongest single month here at 13.9 percent of the annual total, which is still term time, and that works slightly in your favour against towns whose curve peaks in July.
Winter reverses it. December and January between them return 4.9 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 6 times as much in June as it does in December, and August alone outproduces December by about 5 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 Colchester 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 Colchester 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 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 | 41 | 22 | 19 |
| Mar | 21 | 76 | 51 | 25 |
| Apr | 12 | 112 | 45 | 67 |
| May | 17 | 129 | 71 | 58 |
| Jun | 21 | 132 | 92 | 40 |
| Jul | 11 | 132 | 47 | 85 |
| Aug | 0 | 111 | 0 | 111 |
| Sep | 20 | 87 | 58 | 29 |
| Oct | 17 | 54 | 30 | 24 |
| Nov | 21 | 32 | 22 | 10 |
| Dec | 15 | 22 | 11 | 11 |
| Year | 190 | 953 | 465 | 488 |
Colchester schools, phase by phase
Colchester has 80 open state-funded schools and colleges on the DfE register teaching 30,367 pupils between them. Source: DfE Get Information About Schools.
The split is 63 primary, 12 secondary, 3 special and 2 further education, at an average of 380 pupils a site. A ratio of 5.3 to one tells you where the roof area is. It is not with the 63 primaries, which mostly offer a hall and a teaching block each, but with the larger sites that were built with a sports hall and a dining block attached.
Where a multi-academy trust holds several of those sites, surveying the estate in one pass beats taking a roof at a time. The design work, the connection applications and the procurement paperwork are the same job repeated, and a trust that runs them together gets a better answer on all three.
Grid connection through UK Power Networks
UK Power Networks is the network operator here, and their answer on export capacity shapes the design. Any commercial array above 3.68 kW per phase connects under G99 rather than G98, and the application fixes what you are allowed to push back onto the network. If the local network is tight, limiting export rarely breaks the case here: most of the generation is consumed on site while the building is working.
Across Essex the planning database records 221 solar schemes totalling 2787 MW, of which 46 are operational (REPD Q1 2026).
Book a roof survey at your Colchester school
Roof condition decides the order of works on most school estates, so that is where we start. Send us the postcode and a rough roof area, with twelve months of half hourly readings if you have them, and we come back with usable area, modelled output against your own load, and the funding routes.
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.
Colchester school solar, answered
- What would a 220 kWp array produce at a Colchester school?
- Yes, and the figure matters more than the sunshine. 953 kWh per kWp a year puts a 220 kWp array at around 209,700 kWh, on roughly 653 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 Colchester?
- Less is wasted than governors expect, but the figure is worth seeing: 25.5 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 UK Power Networks.
- Who do we apply to for export near Colchester?
- Only UK Power Networks 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 Colchester?
- 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 Colchester. We confirm it either way.
- How many schools are there around Colchester?
- Colchester has 80 open state-funded schools and colleges on the DfE register, with 30,367 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.