A 2 MW warehouse solar system is the upper-mid range for UK distribution and the standard scale for large port warehouses. With 3,700 panels covering 12,000-18,000 sqm of roof, fits 400,000-600,000 sqft buildings. PPA financing dominant at this scale. Freeport ECA delivers materially additional uplift on eligible buildings.
Typical 2 MW system specification
Capacity: 2 MW. Panels: 3,700 modules at 540W. Roof area: 12,000-18,000 sqm usable. Inverters: 16-24 string inverters or 2-4 central. Annual generation: 1,850,000 kWh (1.85 GWh). Capex: £1.4-1.5m installed. AIA + FYA: £225k AIA + £325k FYA = £550k year 1. Payback: 4-5 years.
When 2 MW is the right size
Mega-distribution centres 400,000-600,000 sqft. Large port warehouses (London Gateway, Felixstowe, Liverpool Freeport). Major retailer flagship NDCs (Tesco, John Lewis, M&S). Major 3PL hubs (DHL, GXO, Wincanton, XPO regional flagships). Large food production and processing facilities.
Economics worked example with Freeport ECA
2 MW install on Felixstowe port warehouse (within Freeport East): capex £1.45m. Year-1 tax shield: £225k AIA + £612k Freeport ECA = £837k. Net cash cost £613k. Annual generation 1.85 GWh. At 75% self-consumption: £305k/yr saving + £40k SEG = £345k. Simple payback 4.2 years. After-tax cash 1.8 years. 25-year IRR 31%.
Common questions about 2 mw system
Why does 2 MW make sense for port warehouses?
Port warehouse roof scale (typically 12,000-30,000 sqm) supports 2-5 MW typical. Marine corrosion specification (austenitic stainless or marine-grade aluminium fixings) cost-effective at this scale. Freeport designation (Felixstowe & Harwich, Liverpool, Plymouth, Teesside, Solent, Thames, Humber, East Midlands) delivers Enhanced Capital Allowance — 2 MW capex maximises ECA value.