What would a 500 kWp array produce on a farm near Brecon?

Yes, and the figure matters more than the sunshine. At 828 kWh per kWp a year, a 500 kWp array on a Brecon holding models at around 414,000 kWh. What changes the answer is how much of that the farm uses itself. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Which network operator handles the connection around Brecon?

Applications go to National Grid Electricity Distribution, who run the network across Powys. On a farm the incoming supply matters as much as their answer: a single phase supply caps what can be installed whatever the roof would take.

Solar panels for farms in Brecon

A Brecon farm buys electricity at the worst rate of the day in exactly the hours its roof could be generating. Each survey records the sheet type and condition, the usable area once rooflights and vents come out, and whether the supply is single or three phase.

828 kWh per kWp a year at this latitude, so a 500 kWp array models at about 414,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

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Drawing Brecon unit

Roof 96 x 62 m

Array 500 kWp

Yield 414,000 kWh/yr

Scale 1:500 / Rev A / Powys

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

Brecon / Powys

A modern steel framed agricultural building with its roof covered in solar panels, tractor and trailer in the yard, fields beyond — Industrial stock of the kind we survey across Powys.

Farm building solar PV across Powys

What a farm roof near Brecon generates

Modelled irradiation at this latitude is 1057 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 828 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is about 7 percent below the mean across the areas we cover, so the case here rests on using the output on the holding rather than exporting it.

No solar scheme is recorded in this postcode district in the planning database. On a farm that usually means nothing has been built above the reporting threshold rather than that nothing has been built, because a roof array on a shed rarely appears in it.

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

Jun produces 6.8 times what Dec does on the same roof. A 500 kWp array here models at about 414,000 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	20	10,000
Feb	34	17,000
Mar	69	34,500
Apr	100	50,000
May	115	57,500
Jun	116	58,000
Jul	114	57,000
Aug	97	48,500
Sep	76	38,000
Oct	44	22,000
Nov	26	13,000
Dec	17	8,500

Source: EU PVGIS v5.2

FIG. 2 Brecon against the rest of Powys

Hay on Wye838
Welshpool831
Builth Wells830
Brecon828
Llandrindod Wells825
Newtown820

Brecon ranks 4 of 6 towns we cover in Powys on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 820 to 838, a spread of 18 kWh per kWp. Within Powys that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.

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 National Grid Electricity Distribution

National Grid Electricity Distribution 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 Powys the planning database records 18 solar schemes totalling 39 MW, of which 1 are operational (REPD Q1 2026).

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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 Brecon

What would a 500 kWp array produce on a farm near Brecon?: Yes, and the figure matters more than the sunshine. At 828 kWh per kWp a year, a 500 kWp array on a Brecon holding models at around 414,000 kWh. What changes the answer is how much of that the farm uses itself. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Which network operator handles the connection around Brecon?: Applications go to National Grid Electricity Distribution, who run the network across Powys. On a farm the incoming supply matters as much as their answer: a single phase supply caps what can be installed whatever the roof would take.