What would a 500 kWp array produce in Dolgellau?

Yes, and the number matters more than the sunshine. At 746 kWh per kWp a year, a 500 kWp array on a Dolgellau roof models at around 373,000 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 Dolgellau?

Applications go to SP Energy Networks, who run the network across Gwynedd. They decide the export limit, and we handle the G99 paperwork alongside the array design.

Solar panels for warehouses in Dolgellau

Sheds around Dolgellau tend to have more roof than the business has any other use for. We start with the covering and the structure, because a roof with five years left in it changes the answer entirely.

746 kWh per kWp a year at this latitude, so a 500 kWp array models at about 373,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Book a roof survey in Dolgellau

Drawing Dolgellau unit

Roof 96 x 62 m

Array 500 kWp

Yield 373,000 kWh/yr

Scale 1:500 / Rev A / Gwynedd

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

Dolgellau / Gwynedd

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 Gwynedd.

Distribution centre solar across Gwynedd

What a roof in Dolgellau actually generates

Modelled irradiation at this latitude is 957 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 746 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is about 16 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 Dolgellau roof makes, month by month

May produces 9.2 times what Dec does on the same roof. A 500 kWp array here models at about 373,000 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	16	8,000
Feb	29	14,500
Mar	61	30,500
Apr	93	46,500
May	110	55,000
Jun	109	54,500
Jul	105	52,500
Aug	86	43,000
Sep	66	33,000
Oct	38	19,000
Nov	21	10,500
Dec	12	6,000

Source: EU PVGIS v5.2

FIG. 2 Dolgellau against the rest of Gwynedd

Pwllheli887
Porthmadog820
Caernarfon798
Dolgellau746
Bangor733
Bethesda704

Dolgellau ranks 4 of 6 towns we cover in Gwynedd on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 704 to 887, a spread of 183 kWh per kWp. On a 500 kWp array that is about 91,500 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 SP Energy Networks

SP Energy Networks operates the distribution network across Gwynedd, so the export application goes to them. Anything larger than 3.68 kW per phase falls under G99, which means an application before commissioning rather than a notification afterwards. A constrained network is not the end of a scheme. Capping export costs little when the building already absorbs most of what the roof produces.

Across Gwynedd the planning database records 19 solar schemes totalling 221 MW, of which 6 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 Dolgellau

What would a 500 kWp array produce in Dolgellau?: Yes, and the number matters more than the sunshine. At 746 kWh per kWp a year, a 500 kWp array on a Dolgellau roof models at around 373,000 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 Dolgellau?: Applications go to SP Energy Networks, who run the network across Gwynedd. They decide the export limit, and we handle the G99 paperwork alongside the array design.