How much would a school roof near Penzance generate?

Modelled at 979 kWh per kWp a year, a 240 kWp array on a Penzance school models at about 235,000 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 Penzance?

It goes somewhere, just not into the timetable. 25.7 percent of the Penzance 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 National Grid Electricity Distribution, or a sign the array is too big. We test which before sizing anything.

Which network operator handles the connection at a Penzance school?

Applications go to National Grid Electricity Distribution, who run the network across Cornwall. 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 Cornwall 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 Cornwall on siting and design. Listed buildings and conservation areas are the usual exceptions. We put the position to Cornwall before a design is finalised.

How many schools are there around Penzance?

Cornwall has 277 open state-funded schools and colleges on the DfE register, with 71,014 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.

Specialist solar panels for schools in Penzance

A kilowatt-peak on a Penzance school roof models at 979 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.

979 kWh per kWp a year at this latitude, so a 240 kWp array, the size applied for at the nearest school scheme on record, models at about 235,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Book a roof survey in Penzance

1 teaching block
2 hall and kitchen
3 sports hall
4 1960s block, no array
first phase
later phase

Drawing Typical school site, Penzance scale

Blocks 4, 3 with array

Array about 345 kWp

Yield about 338,000 kWh/yr

Frontage about 90 m / Rev A / TR18

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.

Penzance / Cornwall

A school on the edge of a South West market town, solar arrays on its roofs and rolling farmland beyond — School buildings of the kind we survey across South West. Not a named school and not our work.

Solar PV for academy trusts across Cornwall

A one kilowatt-peak array on a shallow pitched roof in Penzance models at 979 kWh a year, from modelled irradiation of 1,238 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 10 percent above the mean across the towns we cover, which is about as strong as a UK school roof gets.

Scaled up, a 240 kWp array, sized to what the nearest school scheme on record applied for, 24 miles away at Truro, models at about 235,000 kWh a year before shading, and needs roughly 713 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 60,400 kWh landing in July and August and roughly 11,300 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.

FIG. 1 Penzance against the rest of Cornwall

Penzance979
Falmouth943
Newquay940
Truro940
St Austell936
Bodmin929
Bude929
Camborne921

Penzance ranks 1 of 8 towns we cover in Cornwall on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 921 to 979, a spread of 58 kWh per kWp. On a 500 kWp array that is about 29,000 kWh a year between the strongest and weakest town in the county.

Bars are zero based, so length is proportional to the figure. Where a county is flat, that is the finding: latitude is not the lever, the timetable is. Source: EU PVGIS v5.2, modelled per town

The planning position for Penzance schools

Search the Renewable Energy Planning Database for the TR18 postcode district and nothing comes back under education. That is worth stating plainly and then setting aside: the register is built around generating stations, a school array is a fraction of the size it captures reliably, and plenty of school roofs never appear in any national record at all.

The closest recorded one is about 24 miles away at Truro: Sir Ben Ainslie Sports Centre, Trennick Lane, a 240 kWp roof mounted array applied for by Truro 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 Cornwall. Source: Renewable Energy Planning Database, Q1 2026.

Why demand in Penzance falls as the roof peaks

The generating year and the school year are out of step in Penzance. July and August carry 25.7 percent of the modelled output (EU PVGIS v5.2), and the site is closed for most of those nine weeks. 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.

At the other end of the year the mismatch flips. Only 4.8 percent of output falls in December and January, the two months when a Penzance school is fully occupied and its heating and lighting are at their heaviest. The roof makes 6.5 times as much in June as it does in December, and August alone outproduces December by about 5.6 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 Penzance as anywhere else.

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.

The conclusion is not that a Penzance 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 National Grid Electricity Distribution to earn its keep.

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.

FIG. 2 A Penzance roof against the English school year

generated while the school is open
generated at a weekend or in the holidays

The same figures as a table

Monthly output for a 1 kWp array in Penzance, split by whether the day is a school session day. Across the year 49 percent of generation lands while the school is open.
Month	Session days	Output, kWh per kWp	School open	School closed
Jan	20	26	17	9
Feb	15	43	23	20
Mar	21	77	52	25
Apr	12	115	46	69
May	17	133	73	60
Jun	21	136	95	41
Jul	11	134	48	86
Aug	0	117	0	117
Sep	20	90	60	30
Oct	17	55	30	25
Nov	21	31	22	9
Dec	15	21	10	11
Year	190	978	476	502

Output per kWp installed, split by whether the day is a session day. July and August are 25.7 percent of the Penzance year and the school is shut for most of them. Each month's total is spread evenly across its days, which is the only split available without half hourly readings. Session days follow a typical English school year of 190 days. Your own trust or authority may differ by a few days either way. Source: EU PVGIS v5.2, session days from a typical school calendar

The school estate in Cornwall

Cornwall has 277 open state-funded schools and colleges on the DfE register teaching 71,014 pupils between them. Source: DfE Get Information About Schools.

The split is 238 primary, 31 secondary, 5 special and 3 further education, at an average of 256 pupils a site. 7.7 primaries per secondary is a mix weighted towards small sites. The roof area, and therefore most of the generation, sits with the 31 secondaries and the 3 further education sites.

Across an estate of that size the roofs will not be in the same condition, and that is the point of surveying them together: the block with the best orientation is often not the block whose covering has twenty years left in it.

Aerial view of a school site with teaching blocks of several different ages, a sports hall and a playing field, solar arrays on two of the flat roofs — A school site with blocks of several ages, which is the usual starting point for a trust estate survey.

Grid connection through National Grid Electricity Distribution

National Grid Electricity Distribution operates the distribution network across Cornwall, 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 Cornwall the planning database records 174 solar schemes totalling 1116 MW, of which 88 are operational (REPD Q1 2026).

Book the survey

Send us the school postcode

Lenzie Consulting Ltd arranges roof surveys for schools across Cornwall. 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 Penzance trusts ask before a survey

How much would a school roof near Penzance generate?: Modelled at 979 kWh per kWp a year, a 240 kWp array on a Penzance school models at about 235,000 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 Penzance?: It goes somewhere, just not into the timetable. 25.7 percent of the Penzance 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 National Grid Electricity Distribution, or a sign the array is too big. We test which before sizing anything.
Which network operator handles the connection at a Penzance school?: Applications go to National Grid Electricity Distribution, who run the network across Cornwall. 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 Cornwall 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 Cornwall on siting and design. Listed buildings and conservation areas are the usual exceptions. We put the position to Cornwall before a design is finalised.
How many schools are there around Penzance?: Cornwall has 277 open state-funded schools and colleges on the DfE register, with 71,014 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.

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