Is there enough sun around Chelmsford to make this work?

Modelled at 930 kWh per kWp a year for a shallow-pitched roof at this latitude, which puts a 500 kWp array at roughly 465,000 kWh a year before shading. That array needs about 1,485 sqm of clear roof once ridge vents and walkways are allowed for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Who do we apply to for export near Chelmsford?

Only UK Power Networks can answer it for your connection, and on rural feeders the answer varies farm to farm. An export-limited offer usually still works, because a holding with grain drying, cooling or ventilation uses most of what it makes.

Do we need planning permission in Chelmsford?

In most cases no, because panels on the roof of an agricultural building usually sit within permitted development. The exceptions are listed buildings, conservation areas, protected landscapes and arrays that stand proud of the roof. We check with Chelmsford either way.

Has anyone near CM1 already done this?

The planning database records 0 ground mounted and 2 roof mounted solar schemes in this postcode district. That matters less as proof it works and more as evidence of how the local network has treated export applications. Roof arrays under a megawatt often never appear in the database, so the real figure is higher. Source: Renewable Energy Planning Database, Q1 2026.

Solar panels for farms in Chelmsford

A Chelmsford farm buys electricity at the worst rate of the day in exactly the hours its roof could be generating. The survey starts on the covering: fibre cement or steel, its remaining life, the purlin spacing and what the frame will carry.

930 kWh per kWp a year at this latitude, so a 500 kWp array models at about 465,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Book a roof survey in Chelmsford

Drawing Chelmsford unit

Roof 96 x 62 m

Array 500 kWp

Yield 465,000 kWh/yr

Scale 1:500 / Rev A / CM1

Illustrative layout for a unit of this size. Your own figures come from the roof survey.

Chelmsford / Essex

Eastern arable farmland with solar arrays on farm buildings — Industrial stock of the kind we survey across East of England.

Solar for agricultural buildings across Essex

What a farm roof near Chelmsford generates

Modelled irradiation at this latitude is 1190 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 930 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is around 5 percent above the mean across the areas we cover, which is as strong as UK farm rooftop gets outside the south coast.

2 roof mounted schemes are on record nearby. Roof arrays under a megawatt frequently never reach that database at all, so the real number of farm roofs generating around Chelmsford is higher than the record shows.

Surveys run across CM postcodes, CM1 outward.

Chelmsford is the planning authority for most holdings here, and it is the authority that decides whether an array on an agricultural building falls inside permitted development.

FIG. 1 What a Chelmsford roof makes, month by month

Jul produces 5.9 times what Dec does on the same roof. A 500 kWp array here models at about 465,000 kWh across the year, but it arrives unevenly, which is why we size against your summer daytime load and then look at whether storage is worth adding for the shoulder months.

Monthly figures as a table

Month	kWh per kWp	500 kWp array
Jan	25	12,500
Feb	39	19,500
Mar	75	37,500
Apr	108	54,000
May	124	62,000
Jun	128	64,000
Jul	129	64,500
Aug	109	54,500
Sep	86	43,000
Oct	53	26,500
Nov	32	16,000
Dec	22	11,000

Source: EU PVGIS v5.2

FIG. 2 Chelmsford against the rest of Essex

Colchester953
Canvey Island945
Southend-on-Sea942
Basildon933
Braintree932
Chelmsford930
Grays927
Brentwood913
Harlow908

Chelmsford ranks 7 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.

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

Grid connection through UK Power Networks

Connections around Chelmsford are handled by UK Power Networks, which sets the export limit for the site. Above 3.68 kW per phase the connection runs under G99, so the export limit is agreed in advance rather than assumed. Where the local network is constrained, an export-limited connection usually still makes the scheme work, because a farm uses most of what the roof makes during the working day.

Across Essex the planning database records 221 solar schemes totalling 2787 MW, of which 46 are operational (REPD Q1 2026).

Solar already consented near CM1

From the government's Renewable Energy Planning Database, Q1 2026. These are the schemes on record in this postcode district, which is a fair guide to how the local network has been treating export applications.

Scheme	Operator	Capacity	Mounting	Status
Robjohns Road - Solar Photovoltaic Panels	Big Yellow Group Plc	0.18 MW	Roof	Awaiting Construction
Bridgemarsh Care Home, Main Road - Solar Panels	Essex County Council	n/a	Roof	Awaiting Construction

Book the survey

Send us the postcode

Tell us where the unit is and roughly how big the roof is. We come back with what it can carry, what it would generate against your consumption, and the three ways to pay for it.

Lenzie Consulting Ltd arranges the survey and passes your details to our MCS-certified installation partner so they can quote.

Questions about solar in Chelmsford

Is there enough sun around Chelmsford to make this work?: Modelled at 930 kWh per kWp a year for a shallow-pitched roof at this latitude, which puts a 500 kWp array at roughly 465,000 kWh a year before shading. That array needs about 1,485 sqm of clear roof once ridge vents and walkways are allowed for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Who do we apply to for export near Chelmsford?: Only UK Power Networks can answer it for your connection, and on rural feeders the answer varies farm to farm. An export-limited offer usually still works, because a holding with grain drying, cooling or ventilation uses most of what it makes.
Do we need planning permission in Chelmsford?: In most cases no, because panels on the roof of an agricultural building usually sit within permitted development. The exceptions are listed buildings, conservation areas, protected landscapes and arrays that stand proud of the roof. We check with Chelmsford either way.
Has anyone near CM1 already done this?: The planning database records 0 ground mounted and 2 roof mounted solar schemes in this postcode district. That matters less as proof it works and more as evidence of how the local network has treated export applications. Roof arrays under a megawatt often never appear in the database, so the real figure is higher. Source: Renewable Energy Planning Database, Q1 2026.

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