Specialist solar panels for schools in Grays
A kilowatt-peak on a Grays school roof models at 927 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.
25.8% of the modelled year lands in July and August, on a roof that returns 927 kWh per kWp a year. The worked example below runs at 280 kWp, 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 Grays- 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 Essex
A one kilowatt-peak array on a shallow pitched roof in Grays models at 927 kWh a year, from modelled irradiation of 1,190 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 5 percent above the mean across the towns we cover, which is about as strong as a UK school roof gets.
Scaled up, a 280 kWp array, sized to what the nearest school scheme on record applied for, 11 miles away at Canvey Island, models at about 259,600 kWh a year before shading, and needs roughly 832 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 67,000 kWh landing in July and August and roughly 13,200 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.
Grays ranks 8 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.
The planning position for Grays schools
There is no school entry for the RM17 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 Grays.
The closest recorded one is about 11 miles away at Canvey Island: Castle View School, Foksville Road, a 280 kWp roof mounted array applied for by Castle View School, 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 Essex. Source: Renewable Energy Planning Database, Q1 2026.
Why demand in Grays falls as the roof peaks
The generating year and the school year are out of step in Grays. July and August carry 25.8 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 14 percent of the annual total, and it falls almost entirely inside the holiday.
At the other end of the year the mismatch flips. Only 5.1 percent of output falls in December and January, the two months when a Grays school is fully occupied and its heating and lighting are at their heaviest. 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. 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.
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 Grays as anywhere else.
The same mismatch repeats every day. Peak generation lands between eleven and three, the timetable ends shortly after, and by four the site is down to caretaking and cleaning. An annual consumption figure cannot show that, which is why we ask for the half hourly data instead.
The conclusion is not that a Grays 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 UK Power Networks 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.
- 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 | 107 | 43 | 64 |
| May | 17 | 124 | 68 | 56 |
| Jun | 21 | 128 | 90 | 38 |
| Jul | 11 | 130 | 46 | 84 |
| Aug | 0 | 109 | 0 | 109 |
| Sep | 20 | 86 | 57 | 29 |
| Oct | 17 | 54 | 30 | 24 |
| Nov | 21 | 32 | 22 | 10 |
| Dec | 15 | 22 | 11 | 11 |
| Year | 190 | 928 | 452 | 476 |
The school estate in Thurrock
Thurrock has 55 open state-funded schools and colleges on the DfE register teaching 31,147 pupils between them. Source: DfE Get Information About Schools.
The split is 39 primary, 13 secondary and 3 special, at an average of 566 pupils a site. A ratio of 3 to one tells you where the roof area is. It is not with the 39 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).
Send us the school postcode
Lenzie Consulting Ltd arranges roof surveys for schools across Essex. 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.
What Grays trusts ask before a survey
- What would a 280 kWp array produce at a Grays school?
- Yes, and the figure matters more than the sunshine. 927 kWh per kWp a year puts a 280 kWp array at around 259,600 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 Grays?
- Less is wasted than governors expect, but the figure is worth seeing: 25.8 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 Grays?
- 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 Thurrock?
- 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 Thurrock. We confirm it either way.
- How many schools are there around Grays?
- Thurrock has 55 open state-funded schools and colleges on the DfE register, with 31,147 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.