Is there enough sun in 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 walkways and setbacks are allowed for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Who do we apply to for export in Chelmsford?

Capacity varies street by street, and only UK Power Networks can answer it for your connection. We ask the question early, because an export-limited offer changes the design rather than killing the scheme.

Do we need planning permission in Chelmsford?

In most cases no, because roof-mounted panels on commercial buildings sit within permitted development. The exceptions are listed buildings, conservation areas and arrays that stand proud of the roof plane. We check with Chelmsford first either way.

Has anyone near CM1 already done this?

The planning database records 2 solar schemes in this postcode district, 2 of them roof mounted. That matters less as proof that it works and more as evidence of how the local network has been treating export applications. Source: Renewable Energy Planning Database, Q1 2026.

Solar panels for warehouses in Chelmsford

A Chelmsford warehouse roof sits idle through exactly the hours its occupier buys the most expensive electricity. We start with the covering and the structure, because a roof with five years left in it changes the answer entirely.

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

Distribution estate in the east of England with solar arrays on several roofs — Industrial stock of the kind we survey across East of England.

Logistics solar PV across Essex

What a roof in Chelmsford actually 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 towns we cover, which is as good as UK rooftop gets outside the south coast.

Distribution stock around Chelmsford clusters on A12, A130 and A414, which is where the large single-let roofs are.

Surveys run across CM postcodes, CM1 outward.

Chelmsford is the planning authority for most sites here, and the built-up area holds a population of about 110,625, the size that tends to be served by mid-box last-mile units rather than national hubs (ONS Census 2021 built-up areas).

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 warehouse 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 in 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 walkways and setbacks are allowed for. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Who do we apply to for export in Chelmsford?: Capacity varies street by street, and only UK Power Networks can answer it for your connection. We ask the question early, because an export-limited offer changes the design rather than killing the scheme.
Do we need planning permission in Chelmsford?: In most cases no, because roof-mounted panels on commercial buildings sit within permitted development. The exceptions are listed buildings, conservation areas and arrays that stand proud of the roof plane. We check with Chelmsford first either way.
Has anyone near CM1 already done this?: The planning database records 2 solar schemes in this postcode district, 2 of them roof mounted. That matters less as proof that it works and more as evidence of how the local network has been treating export applications. Source: Renewable Energy Planning Database, Q1 2026.

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