Sowton Industrial Estate — Exeter's commercial solar hub
Sowton Industrial Estate (EX2, M5 J29) is Exeter's largest and most logistics-focused commercial zone. Key solar targets: Sainsbury's Exeter Distribution Depot (large-format regional DC, excellent roof for 1-3 MW, Tesco Net Zero programme context); Co-op regional warehouse (EX2 — grocery logistics, self-consumption 82-87%); Travis Perkins and BSS distribution (building materials, 200-500 kW range); Marshall Motor Group (vehicle distribution, good roof profile). Marsh Barton Trading Estate (EX2) — the UK's largest out-of-town trading estate: 500+ businesses, mixed commercial, manufacturing, motor trade, service sector; units typically 100-500 kW; Marsh Barton BID has an active sustainability programme; many pre-2000 roofs that benefit from combined re-roof + solar advice.
South West irradiance advantage — Exeter vs UK average
Exeter irradiance: 970-1,010 kWh/kWp/yr — placing it firmly in the UK's top tier for major logistics markets. Comparison at 1 MW scale: Aberdeen 840-880 kWh/kWp/yr = 840-880 MWh/yr; Manchester 920-950; Birmingham 940-970; Exeter 970-1,010 MWh/yr. Compared to Midlands equivalent: approximately 30-70 MWh/yr more generation = £6,600-£15,400 additional annual saving at 22p/kWh. Over 25 years (at 5% discount rate, 0.5% annual tariff escalation): £120k-£275k additional NPV from irradiance advantage alone. The South West irradiance advantage is permanent, structural, and compounds with tariff escalation. Exeter also benefits from lower cloud cover than Midlands and North — more consistent generation throughout the year.
Devon County Council net zero planning framework
Devon County Council declared a Climate Emergency in 2019, committing Devon to carbon neutrality by 2050 with net zero for council operations by 2030. Exeter City Council has a 2030 net zero target. Commercial planning implications: (1) Exeter City Council planning officers are actively supportive of commercial solar PV applications on industrial estate buildings; (2) No additional planning requirement for Permitted Development solar in most Sowton/Marsh Barton locations; (3) Devon and Cornwall LEP (Invest South West) provides business support and signposting for commercial energy projects; (4) Exeter City Council's Local Plan 2020-2040 includes energy performance requirements for new commercial developments that give solar PV planning weight. New-build logistics developments in Exeter now routinely achieve planning permission with solar PV as a condition.
WPD G99 in Exeter and EX postcode economics
Western Power Distribution (WPD, now National Grid) serves all Exeter EX postcodes. G99 feasibility: 65-85 working days. Connection works: 5-7 months from study acceptance — comparable to WPD timelines across the rest of the South West and Wales. Sowton Industrial Estate is well-served by WPD — multiple large G99 connections already complete at the estate (good precedent for capacity availability). Exeter pharmaceutical distribution (Lloyds Pharmacy distribution, DEVA cold chain, bio-pharma warehousing in EX2): pharmaceutical cold chain operations can qualify for IETF 20-30% on qualifying controlled temperature storage processes. Matford Business Park (EX2): mixed commercial, growing from logistics and professional services, 200-500 kW typical.
Common questions
What is the payback for Exeter warehouse solar?
Sowton/Marsh Barton logistics: 4-5 year simple payback. After-tax AIA: 3-4 years. Pharmaceutical cold chain with IETF: 3-4 years. The South West irradiance advantage (970-1,010 kWh/kWp/yr) means Exeter systems generate 3-7% more energy annually than equivalent Midlands systems — worth approximately 3-6 months faster payback.
How long does WPD G99 take in Exeter?
WPD (Western Power Distribution) serves Exeter EX postcodes. G99: 5-7 months from study approval to energisation for 1-5 MW systems. Sowton Industrial Estate has existing WPD grid infrastructure — connections there are typically at the faster end of the WPD range. Submit G99 immediately after structural survey.