Specialist solar panels for schools in Welwyn Garden City
A 190 kWp array at Ridgeway Academy, Herns Lane is the nearest school scheme on the planning record, and it holds consent and is awaiting construction. 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.
899 kWh per kWp a year at this latitude, so a 190 kWp array, the median size schools around Welwyn Garden City have applied for, models at about 170,800 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Welwyn Garden City- 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 solar consented near Welwyn Garden City
The Renewable Energy Planning Database records 1 school and college solar scheme in the AL7 postcode district. Ridgeway Academy, Herns Lane is down for a 190 kWp roof mounted array and the application holds consent and is awaiting construction. The applicant on record is Earthpoints Limited.
Those are other organisations' planning applications, not our projects. We list them because a scheme a few miles away tells you what this local authority and this network operator have already accepted for a building very like yours. Source: Renewable Energy Planning Database, Q1 2026.
The plan above the fold is a generic four block estate, drawn to make the scale and the phasing legible. Nobody should read it as Ridgeway Academy, Herns Lane or as any other Welwyn Garden City site. Our knowledge of these applications comes entirely from the public record.
The median array applied for here is 190 kWp. At 190 kWp you are covering roughly 564 square metres of roof once walkways, edge zones and rooflight setbacks come out, which on most sites means a sports hall plus one teaching block rather than the whole estate.
Every one of them is a secondary school, which is worth knowing: a secondary site normally has a sports hall, a dining block and several flat roofs, which is where the usable area comes from.
| Site on record | Applicant on record | Size | Mounting | Status |
|---|---|---|---|---|
| Ridgeway Academy, Herns Lane | Earthpoints Limited | 190 kWp | Roof | Awaiting Construction |
Solar PV for academy trusts across Hertfordshire
A one kilowatt-peak array on a shallow pitched roof in Welwyn Garden City models at 899 kWh a year, from modelled irradiation of 1,152 kWh per square metre in the plane of the array (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). Against a mean of 886 kWh per kWp across the towns we cover, Welwyn Garden City is unremarkable, which is the useful finding: the scheme will be decided by the load curve, not the map.
Scaled up, a 190 kWp array, sized to the median array applied for at schools around Welwyn Garden City itself, models at about 170,800 kWh a year before shading, and needs roughly 564 square metres of clear roof. That size is not one we chose. It is what schools in this district have actually applied for.
Spread across the year that is about 43,900 kWh landing in July and August and roughly 8,500 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.
Welwyn Garden City ranks 6 of 10 towns we cover in Hertfordshire on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 895 to 911, a spread of 16 kWh per kWp. Within Hertfordshire that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.
Why demand in Welwyn Garden City falls as the roof peaks
The generating year and the school year are out of step in Welwyn Garden City. 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. July is the single strongest month here at 13.9 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 percent of output falls in December and January, the two months when a Welwyn Garden City school is fully occupied and its heating and lighting are at their heaviest. The roof makes 6 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 Welwyn Garden City 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 Welwyn Garden City 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 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 | 24 | 15 | 9 |
| Feb | 15 | 38 | 20 | 18 |
| Mar | 21 | 73 | 49 | 24 |
| Apr | 12 | 104 | 42 | 62 |
| May | 17 | 120 | 66 | 54 |
| Jun | 21 | 124 | 87 | 37 |
| Jul | 11 | 125 | 44 | 81 |
| Aug | 0 | 106 | 0 | 106 |
| Sep | 20 | 83 | 55 | 28 |
| Oct | 17 | 51 | 28 | 23 |
| Nov | 21 | 30 | 21 | 9 |
| Dec | 15 | 21 | 10 | 11 |
| Year | 190 | 899 | 437 | 462 |
The school estate in Welwyn Hatfield
Welwyn Hatfield has 49 open state-funded schools and colleges on the DfE register teaching 17,056 pupils between them. Source: DfE Get Information About Schools.
The split is 39 primary, 6 secondary and 4 special, at an average of 348 pupils a site. At 6.5 primaries to every secondary, most of the buildings here are small. That is not a reason to skip them, but it does mean the usable area on a primary is a hall roof and a teaching block rather than an estate.
For a trust with more than one site in Welwyn Hatfield, the first survey is worth running across the whole estate. It tells you which roofs are near the end of their covering life, which have the switchboard headroom, and therefore which one should carry the first array.
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 Hertfordshire the planning database records 119 solar schemes totalling 844 MW, of which 12 are operational (REPD Q1 2026).
Send us the school postcode
Lenzie Consulting Ltd arranges roof surveys for schools across Hertfordshire. 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 Welwyn Garden City trusts ask before a survey
- How much would a school roof near Welwyn Garden City generate?
- Modelled at 899 kWh per kWp a year, a 190 kWp array on a Welwyn Garden City school models at about 170,800 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 Welwyn Garden City?
- It goes somewhere, just not into the timetable. 25.7 percent of the Welwyn Garden City 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 UK Power Networks, or a sign the array is too big. We test which before sizing anything.
- Which network operator handles the connection at a Welwyn Garden City school?
- Applications go to UK Power Networks, who run the network across Hertfordshire. 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 Welwyn Hatfield 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 Welwyn Hatfield on siting and design. Listed buildings and conservation areas are the usual exceptions. We put the position to Welwyn Hatfield before a design is finalised.
- Has a school near AL7 already done this?
- One school scheme is on record in this postcode district, including a 190 kWp array at Ridgeway Academy, Herns Lane that holds consent and is awaiting construction. We were not involved in it. It is a public planning record, and it matters less as proof that solar works than as evidence of what this authority and this network operator have already accepted. Source: Renewable Energy Planning Database, Q1 2026.
- How many schools are there around Welwyn Garden City?
- Welwyn Hatfield has 49 open state-funded schools and colleges on the DfE register, with 17,056 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.