Celsa Steel Cardiff — IETF electric arc furnace case study
Celsa Steel's Cardiff Bay plant is the UK's largest electric arc furnace steel producer — and one of the UK's highest-profile IETF recipients. The Celsa EAF consumes circa 400 GWh/yr of electricity. Solar PV even at 5-10 MW scale (the maximum for Cardiff Bay roof areas) cannot make a large dent in that consumption — but it demonstrates the model for the Welsh manufacturing sector: (1) Celsa Steel IETF Phase 3/4 at 40-50% capital grant (publicly confirmed); (2) IETF for steel EAF operations at highest intervention rate; (3) Welsh Government co-funding available for Welsh manufacturers. For surrounding Celsa supply chain businesses (logistics, metal finishing, engineering services) in CF10-24 postcodes: IETF 20-35% available for qualifying energy-intensive processes. WPD CF postcodes G99: 5-7 months.
Cardiff logistics market — Wentloog and St Mellons
Cardiff's primary logistics and distribution zones: Wentloog Logistics Park (CF3) — South Wales's premium logistics zone, Amazon, Lidl, DHL, Royal Mail, large units 500 kW to 3 MW; St Mellons Business Park (CF3) — mixed industrial and logistics, modern warehouse, 200-800 kW range; Capital Business Park, Wentloog (CF3) — institutional-grade logistics, SEGRO and Prologis presence; Tremorfa Industrial Estate (CF24) — port-adjacent Cardiff Bay, manufacturing, 300-1,500 kW; Leckwith (CF11) — south Cardiff commercial, mixed use, smaller units 100-400 kW. New planning permissions in Wentloog are solar-ready by design — council planning conditions in CF3 now encourage or require PV provision for large logistics developments.
Welsh Government grants and Development Bank of Wales
Wales has a multi-layer grant and finance stack for commercial solar: (1) Welsh Government Business Wales SME Energy Audit + Grant (up to £20k for audit + 30-50% for recommended measures including solar PV for SMEs); (2) Development Bank of Wales (DBW) — commercial loan finance at competitive rates for SME decarbonisation, 5-15 year terms; (3) IETF for manufacturing at Cardiff industrial estates (20-50% depending on energy intensity); (4) Valleys Taskforce: additional support for businesses in the South Wales Valleys postcodes (NP, CF41-CF46); (5) Standard 100% AIA across all Welsh businesses. DBW loans stack with Welsh Government grants and IETF — providing the most comprehensive public finance stack of any UK nation for commercial solar. Cardiff businesses served by Cardiff Council's Net Zero 2030 programme.
WPD G99 in Cardiff and CF postcode irradiance
Western Power Distribution (WPD, now National Grid) serves Cardiff and all Welsh CF postcodes. WPD is one of the faster DNOs for large commercial connections: G99 feasibility study: 65-85 working days; connection works: 5-7 months from acceptance in Cardiff area (CF1-CF24). This is significantly faster than SP Networks in Scotland (8-12 months) and SSEN (6-14 months). Cardiff irradiance: 960-1,000 kWh/kWp/yr — better than northern England by 15-20%, better than Scotland by 15-20%. For Wentloog logistics (CF3): self-consumption 78-82% for daytime operations; payback 4.5-5.5 years.
Common questions
What IETF grant rate applies to Cardiff manufacturing?
Manufacturing businesses at Cardiff industrial sites (Tremorfa, Wentloog, Leckwith) can access IETF grants of 20-50% on qualifying solar PV installations. The exact rate depends on your energy-intensive process classification. Celsa Steel's EAF operations receive IETF at 40-50%. General manufacturing and food production typically 20-35%. We assess IETF eligibility as part of free desk feasibility.
How long does G99 take with WPD in Cardiff?
WPD (Western Power Distribution) serves Cardiff — G99 connections in CF postcodes typically take 5-7 months from study approval to energisation. This is faster than Scotland (SP Networks 8-12 months) and Northern England is similar. WPD is one of the more predictable DNOs. We submit G99 on day one after structural survey.