Southampton combines the UK's second-highest irradiance with Solent Freeport ECA stacking — delivering some of the best year-one tax economics in the country.
Southampton solar economics
Irradiance 1,010-1,060 kWh/kWp/yr — second nationally after Cornwall. Grid retail 22-23p/kWh. Solent Freeport ECA: additional £125,000-£187,500 year-one tax benefit on £1-1.5m project. Standard DC payback: 5-6yr. After Freeport ECA: 3.5-5yr.
Freeport ECA advantage
Eastern Docks, Western Docks and surrounding logistics estate within Solent Freeport zone. 100% ECA stacks with 100% AIA. For £1.5m project: £562.5k total year-one tax shield vs £375k outside Freeport. Confirm building eligibility at solentfreeport.co.uk.
DP World and port Scope 3
DP World net zero 2050 flows through port logistics supply chain. Port cold chain (Lineage Logistics, NewCold Marchwood), automotive import logistics (BMW, Mercedes, JLR — Scope 3 active). Cold chain self-consumption: 90-95%.
SSEN G99: start early
SSEN 6-10 months SO postcodes. SO16, SO30, SO45: faster (6-8 months). Submit G99 same-week as structural survey.
See more
Southampton guide: /guides/warehouse-solar-southampton/. Freeport guide: /guides/warehouse-solar-freeport/. Contact: /contact/.