The Celtic Freeport designation — awarded to the Milford Haven and Port Talbot area in 2023 — created one of only eight UK Freeport designations and the only one in Wales. The Freeport outer boundary extends across a substantial portion of west and south Wales including Fishguard Harbour, and the tax and regulatory incentives that come with Freeport status have a direct bearing on the commercial solar investment case for businesses operating within the boundary.
What Celtic Freeport status means for solar investment
UK Freeport businesses operating within the outer boundary are eligible for Enhanced Capital Allowances (ECAs) at 100% in year one on qualifying plant and machinery. Solar PV systems are qualifying plant and machinery for capital allowances purposes. In practical terms, this means a Freeport business can write off the entire solar installation cost in year one rather than spreading it across the standard Annual Investment Allowance programme.
For businesses that have already exhausted their AIA annual limit (£1 million per year from 2023) — common for port operators, logistics businesses and energy-intensive manufacturers — the ECA provides an additional first-year write-off route. For smaller businesses within the AIA limit, the tax effect is equivalent, but the Freeport ECA provides certainty that the write-off applies even if AIA limits change.
Stamp Duty Land Tax relief and National Insurance contributions relief in Freeport Tax Sites are also available for qualifying businesses making new investments — though these apply to the inner Tax Site boundary rather than the broader outer boundary. FLD identifies the specific boundary position for each client at the business case stage.
Fishguard Harbour: the port estate opportunity
Fishguard Harbour at SA65 is the Stena Line ferry terminal for the Wales-Ireland crossing and is within the Celtic Freeport outer boundary. The harbour estate carries port logistics buildings, passenger terminal structures, vehicle holding and marshalling facilities, and harbour management buildings. These are operational 24 hours a day with consistent electricity demand from terminal lighting, ventilation, baggage handling and vehicle charging.
At 985 kWh/kWp, a 100 kWp installation on Fishguard Harbour terminal buildings generates 98,500 kWh annually. With 78% self-consumption on 24-hour port operations at 26p/kWh, year-one saving reaches approximately £25,500 on £88,000 capex. Under ECA full write-off at 25% CT rate, effective capex reduces to £66,000. Post-tax payback: 2.6 years.
The Goodwick industrial estate adjacent to the port carries logistics and warehousing businesses serving the ferry trade. These are standard commercial solar clients at 30 to 100 kWp scale, with payback of 3 to 4 years before Freeport allowances.
Milford Haven: the refinery and LNG terminal context
Milford Haven is the UK’s third-largest port by tonnage and the primary LNG import terminal serving Wales and the English West. The Valero and Puma refineries, Dragon LNG and South Hook LNG terminals occupy the Haven waterway and generate electricity consumption that dwarfs any other industrial concentration in FLD’s coverage area.
For these major installations, solar at 100 to 500 kWp on ancillary buildings — offices, workshops, warehouses — is a practical scope rather than a whole-site energy solution. The self-consumption case is strong: ancillary buildings at refineries and terminal sites run standard office and maintenance loads 24 hours a day. A 200 kWp Milford Haven ancillary-buildings installation generates approximately 197,000 kWh annually at 985 kWh/kWp, saving approximately £43,000 per year with 80% self-consumption.
The Pembrokeshire farm context: Farming Connect at 985 kWh/kWp
Beyond the port and industrial base, the Pembrokeshire hinterland around Fishguard carries some of the most productive farm solar economics in Wales. At 985 kWh/kWp — the highest yield in FLD’s coverage outside St Davids — a 50 kWp farm building near Fishguard generates 49,250 kWh annually. With Farming Connect grant at 40%, post-grant payback on a dairy or livestock holding falls below 2 years in the best cases.
FLD covers Fishguard on the same circuit as Haverfordwest and St Davids. Call Paul on 01792 680611 to discuss a Celtic Freeport commercial survey or farm installation in the Fishguard area.