What would a 500 kWp array produce in Hay on Wye?

Yes, and the number matters more than the sunshine. At 838 kWh per kWp a year, a 500 kWp array on a Hay on Wye roof models at around 419,000 kWh. What changes the answer is how much of that you use on site rather than export. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Which network operator handles the connection in Hay on Wye?

Applications go to National Grid Electricity Distribution, who run the network across Powys. They decide the export limit, and we handle the G99 paperwork alongside the array design.

Solar panels for warehouses in Hay on Wye

What makes a Hay on Wye scheme work is rarely the panels. It is the condition of the roof underneath them. Each survey records the cladding profile, the usable area once rooflights and plant are removed, and the export limit worth applying for.

838 kWh per kWp a year at this latitude, so a 500 kWp array models at about 419,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Book a roof survey in Hay on Wye

Drawing Hay on Wye unit

Roof 96 x 62 m

Array 500 kWp

Yield 419,000 kWh/yr

Scale 1:500 / Rev A / Powys

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

Hay on Wye / Powys

Aerial view of an industrial estate where some warehouse roofs carry solar arrays and others are bare steel — Industrial stock of the kind we survey across Powys.

Logistics solar PV across Powys

What a roof in Hay on Wye actually generates

Modelled irradiation at this latitude is 1067 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 838 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is about 5 percent below the mean across the towns we cover, so the case here leans harder on how much you use on site rather than on raw generation.

FIG. 1 What a Hay on Wye roof makes, month by month

Jul produces 6.6 times what Dec does on the same roof. A 500 kWp array here models at about 419,000 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	68	34,000
Apr	99	49,500
May	116	58,000
Jun	117	58,500
Jul	118	59,000
Aug	99	49,500
Sep	77	38,500
Oct	45	22,500
Nov	26	13,000
Dec	18	9,000

Source: EU PVGIS v5.2

FIG. 2 Hay on Wye against the rest of Powys

Hay on Wye838
Welshpool831
Builth Wells830
Brecon828
Llandrindod Wells825
Newtown820

Hay on Wye ranks 1 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).

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 Hay on Wye

What would a 500 kWp array produce in Hay on Wye?: Yes, and the number matters more than the sunshine. At 838 kWh per kWp a year, a 500 kWp array on a Hay on Wye roof models at around 419,000 kWh. What changes the answer is how much of that you use on site rather than export. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Which network operator handles the connection in Hay on Wye?: Applications go to National Grid Electricity Distribution, who run the network across Powys. They decide the export limit, and we handle the G99 paperwork alongside the array design.