Commercial Solar in the South West
MCS-certified commercial solar installers covering Devon, Cornwall, Dorset, Somerset, Bristol, Wiltshire and Gloucestershire. The South West's highest solar irradiance region in the UK.
Quick Answer
Which part of England gets the most solar irradiance?
The South West — specifically Cornwall, Devon, and the Isles of Scilly — receives the highest solar irradiance in England at 1,150–1,200 kWh/m²/year. This is approximately 20% higher than the Midlands and 35% higher than Scotland. A 100kWp commercial system in Cornwall generates 95,000–100,000 kWh/year, saving a business paying 29p/kWh around £27,500–£29,000 annually — one of the strongest commercial solar ROI cases in the UK.
Why the South West Is the UK's Premier Commercial Solar Region
The South West of England receives more sunshine hours than any other English region, making it uniquely suited to commercial solar investment. Devon and Cornwall average 1,500–1,600 sunshine hours per year — approaching Mediterranean levels — while the irradiance levels that determine actual electricity generation (1,150–1,200 kWh/m²/year) are the highest in England.
Combined with the region's strong agricultural sector (farms, polytunnels, cider orchards), growing food and drink manufacturing, tourism-driven hospitality, and a robust SME business base, the South West has more commercial solar installation activity per capita than any other English region.
1,200
kWh/m² irradiance
1,600
Sunshine hours/year
2.5-3.5yr
Typical payback
£27-29k
Annual saving (100kWp)
Counties & Coverage in the South West
| County | Postcodes | DNO | Solar Irradiance |
|---|---|---|---|
| Cornwall | TR, PL (west) | Western Power Distribution | 1,150–1,200 kWh/m² |
| Devon | EX, PL, TQ | Western Power Distribution | 1,100–1,160 kWh/m² |
| Dorset | DT, BH | Western Power Distribution | 1,080–1,130 kWh/m² |
| Somerset | TA, BA (S), BS (S) | Western Power Distribution | 1,050–1,100 kWh/m² |
| Bristol / BANES | BS, BA1–BA2 | Western Power Distribution | 1,020–1,060 kWh/m² |
| Wiltshire | SN, SP, BA | Western Power Distribution | 1,010–1,060 kWh/m² |
| Gloucestershire | GL | Western Power Distribution | 1,010–1,050 kWh/m² |
Grid Connection: Western Power Distribution in the South West
Western Power Distribution (now trading as National Grid Electricity Distribution) manages G99 connections across the entire South West region. The South West has historically been one of the most congested DNO areas for solar connections due to high existing generation levels — early pre-application engagement is essential.
WPD's generation queue for new connections has improved significantly since 2024 following smart grid investments. For systems between 50–500kWp, expect 14–18 weeks from formal G99 application to connection. We submit applications on day one of project sign-off to minimise delays.
Key Sectors in the South West
Agriculture & Horticulture
The South West's agricultural sector — beef and dairy in Devon, arable farming in Wiltshire and Dorset, market gardens and polytunnels in Cornwall — makes it the UK's most active region for farm solar. The Farming Equipment & Technology Fund (FETF) provides grants of £5,000–£50,000 for solar installations on agricultural buildings. Combined with AIA tax relief, South West farms can achieve payback periods of under 3 years.
Food & Drink Manufacturing
The South West hosts some of the UK's most energy-intensive food and drink operations: Davidstow Creamery (Cornwall's largest employer), Ginsters, Rodda's, Thatchers Cider, and dozens of fish processing operations along the Cornish coast. These facilities run 24/7 with high base loads, making commercial solar with battery storage particularly effective.
Tourism & Hospitality
The South West's tourism economy — holiday parks, coastal hotels, farm stays, and leisure centres — benefits from solar seasonality that closely matches visitor demand. High summer generation aligns with peak occupancy. Many large holiday parks have installed 200–500kWp systems with payback periods of 4–6 years.
Defence & Aerospace
Major defence and aerospace sites across the region, including RNAS Culdrose (Cornwall), HMNB Devonport (Plymouth), and Leonardo's Yeovil facility (Somerset), have active solar programmes driven by MoD Net Zero commitments and energy security requirements.
Commercial solar survey across the South West
WPD G99 managed. All South West counties covered. Cornwall, Devon, Dorset, Somerset, Bristol, Wiltshire, Gloucestershire.
Book South West Solar SurveyFrequently Asked Questions — Commercial Solar in the South West
Frequently Asked Questions
Which South West counties get the most solar energy?
Cornwall and Devon get the most solar irradiance in England at 1,150–1,200 kWh/m²/year — around 20% more than the Midlands. This translates directly to higher generation and faster payback. A 100kWp system in Cornwall generates approximately 97,000 kWh/year; the same system in the East Midlands generates around 83,000 kWh/year.
Is Western Power Distribution (WPD) slow for G99 connections?
WPD's connection queue has improved significantly since 2024. Most commercial systems in the South West can now get G99 approval within 14–18 weeks. Coastal Cornwall and some rural Devon areas with constrained grids may take longer — pre-application feasibility checks with WPD are essential for sites in these areas. We manage this process fully for our clients.
What grants are available for commercial solar in the South West?
UK-wide Annual Investment Allowance (100% Year 1 tax relief) applies nationally. Agricultural businesses in the South West can also access FETF grants (£5,000–£50,000), while SMEs can apply to the UK Shared Prosperity Fund administered through Cornwall Council, Devon County Council, and Somerset Council.
Do I need planning permission for commercial solar in Devon or Cornwall?
Most rooftop commercial solar in Devon and Cornwall qualifies for Permitted Development under the Town and Country Planning (General Permitted Development) Order 2015. Exceptions include Listed Buildings, Conservation Areas, Areas of Outstanding Natural Beauty (AONB), and the Dartmoor/Exmoor National Parks. Ground-mounted systems over 1MW require full planning consent. We handle all planning pre-application consultations.
How does commercial solar work for a South West farm?
South West farms are ideal candidates for commercial solar. Farm buildings with south or south-west facing roofs in Devon or Cornwall generate approximately 90,000–100,000 kWh/year per 100kWp. Combined with FETF grants and AIA tax relief, typical payback is 3–4 years. We size systems against your farm's electricity consumption profile, including grain drying, milking, and cold storage loads.
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