The UK's Ground-Mount Solar Pipeline Is the Largest in History. Here Is Why Secondary Infrastructure Specification Has Never Mattered More.

The UK ground-mount solar market grew 90% in 2025 and is forecast to grow a further 60% in 2026. Thousands of hectares of panels are going into the ground. The secondary infrastructure supporting them needs to last 30 years. Here is why FRP is the specification that delivers that.

Published by Reinforce Technology  |  April 2026

The UK ground-mount solar market has had two exceptional years in succession. In 2025, 2.5 GWp of utility-scale ground-mount solar was completed — 90% growth on 2024 — taking the UK's total operational ground-mount capacity past 14 GWp and the overall solar capacity beyond 23 GWp (Solar Power Portal, 2026). By Q1 2026, close to 800 MWp had already been completed, and the market is forecast to grow a further 60% year on year across the full year — comfortably the best year on record (Solar Power Portal, 2026).

The projects driving this growth are getting larger. The 373 MW Cleve Hill Solar Farm, the UK's largest operational solar installation, came online in 2025. Projects at 99.9 MWac are now being submitted to local planning authorities rather than the Planning Inspectorate, using the new threshold that came into force in December 2025. Nearly 6 GWp of Nationally Significant Infrastructure Projects have been approved by the government, with further large-scale construction pipelines extending well into the decade (House of Commons Library, 2026).

The scale of what is being built — and the speed at which it needs to be built — creates a specific and urgent question for EPC contractors, developers, and asset owners: what is the secondary infrastructure that supports these installations built from, and will it last the 25 to 30-year operational life of the panels it carries?

For ground-mount solar farms, that secondary infrastructure includes the sub-frame structural profiles beneath the panels, the cable trays routing DC power to inverters across the site, the maintenance walkways between panel rows, and the drainage systems managing ground-level water around the array. Each of these components lives outdoors, at ground level or close to it, for the full operational life of the farm. And each of them, if specified in galvanised steel, carries a corrosion liability that begins accumulating from day one.

UK ground-mount solar grew 90% in 2025 and is forecast to grow a further 60% in 2026 — the largest pipeline in the sector's history. The secondary infrastructure supporting these installations determines whether they perform for their full 30-year operational life.

The Ground-Mount Environment: Why Secondary Infrastructure Specification Matters

A ground-mount solar farm is one of the most demanding environments for secondary structural infrastructure in the UK. Unlike a rooftop installation, where the structure is elevated and partially sheltered, ground-mount secondary infrastructure sits at field level — in permanent contact with soil moisture, exposed to rainfall from above and ground water from below, subject to temperature cycling across the full UK seasonal range, and in coastal or agricultural locations, exposed to salt air or agrochemical residues that accelerate corrosion significantly.

The panels themselves have a 25-year performance warranty and are typically designed for a 30-year operational life. The steel mounting frames and secondary infrastructure that supports them is generally specified with the same lifespan in mind. In practice, galvanised steel in a ground-level outdoor environment in the UK will begin to show measurable corrosion within three to five years at fixing points and cut edges, where the protective zinc coating is broken during fabrication and installation. In coastal sites — which account for a significant proportion of the UK's solar pipeline given the solar resource in the South West and South East — that timeline is compressed further.

The consequence is a maintenance cycle that accumulates across the operational life of the asset: inspection, recoating, and in some cases structural assessment and replacement, all on infrastructure that is spread across potentially hundreds of hectares of open field. Access costs on a large ground-mount site are not trivial. Inspection of secondary infrastructure across a 50 MW or 100 MW installation involves significant site access, specialist labour, and documentation — and each recoating intervention requires the same again, plus materials and the operational disruption of working around live generating equipment.

The secondary infrastructure decision on a ground-mount solar farm is not a minor procurement line. It is a decision that determines the operational cost profile of the asset across its full 30-year life — and the difference between a specification that compounds into maintenance cost and one that eliminates it.

What FRP Delivers on a Ground-Mount Solar Farm

1. Corrosion Immunity Across the Full 30-Year Life

FRP does not corrode. This statement holds as true at year twenty-five of a ground-mount installation as it does at year one. There is no zinc coating to deplete, no epoxy layer to crack at fixing points, and no rust to develop at cut edges or connection interfaces. FRP structural profiles and cable management systems maintain their structural performance and surface integrity throughout the full operational life of the solar farm, in every environment the UK solar pipeline encompasses — coastal, agricultural, humid, and high-UV (Income Pultrusion, 2025).

A case study from a coastal solar installation in Florida demonstrated this performance difference with unusual clarity: FRP racking systems remained structurally intact after five years of operation, while equivalent steel components at the same site showed measurable rust and structural degradation (Income Pultrusion, 2025). UK coastal sites — particularly in the South West and along the English Channel coast, where a significant portion of the approved planning pipeline is concentrated — present equivalent or more demanding corrosion conditions. FRP eliminates that risk category from the asset's operational profile entirely.

2. Lightweight — Critical at Ground-Mount Scale

Ground-mount solar installations involve enormous quantities of secondary structural material distributed across large areas of ground. On a 50 MW installation covering several hundred hectares, the cumulative weight of cable trays, sub-frame profiles, walkway systems, and drainage channels in steel is substantial — and that weight has to be transported to often remote rural sites, unloaded, distributed across the site, and installed by installation teams working at pace on tight EPC timelines.

FRP structural profiles are approximately 75 to 80% lighter than equivalent steel sections (Creative Composites Group, 2025). On a ground-mount site, this translates to meaningfully lower transport costs — shipping and logistics costs for FRP are 80 to 90% lower than steel due to weight savings (Income Pultrusion, 2025) — and significantly faster installation. FRP sections can be handled and positioned by a single operative without mechanical assistance, reducing crew size and installation time on sites where programme delivery is under commercial pressure. No welding is required — all connections are bolted — eliminating hot work permits and the specialist welding labour they require.

3. Non-Conductive — A Safety Advantage on High-Voltage DC Sites

Ground-mount solar farms operate with high-voltage DC cabling running from panel strings through combiners to central inverters. DC arcing is more persistent and harder to interrupt than AC arcing, and the consequences of a fault propagating through conductive secondary infrastructure are significantly more serious than in an AC environment. FRP cable trays and structural profiles are electrically non-conductive — they cannot become accidental current paths, do not require earthing and bonding in the way that steel systems do, and eliminate a category of electrical risk that conductive secondary infrastructure cannot (Alttower, 2025).

The earthing and bonding work that steel cable management requires on a large ground-mount site is a meaningful installation cost — specialist electricians, additional materials, connection documentation, and periodic verification over the operational life. FRP eliminates that programme element entirely, both at installation and across the asset's operational life.

4. UV Resistance and Weather Performance

FRP formulated with UV-stable resins does not degrade under prolonged UV exposure. On a ground-mount site, secondary structural profiles and cable management systems receive direct UV exposure for the full operational life of the installation — 30 years of UK sunlight, temperature cycling between winter lows and summer peaks, and rainfall and ground-level humidity cycling. Steel's protective coatings degrade under UV and thermal cycling from day one of operation. FRP's UV resistance is an intrinsic material property, not a surface treatment — it does not diminish with time (Alttower, 2025). FRP is rated for service in temperature extremes from -40°C to +60°C with UV protection, covering the full range of UK and European climate conditions (Aeron Composite, 2025).

FRP structural profiles on ground-mount solar farms deliver corrosion immunity, UV resistance, and maintenance-free performance across the full 30-year operational life — in coastal, agricultural, and inland environments alike.

The Technical Specification: What FRP Replaces on a

Ground-Mount Site

The secondary infrastructure on a utility-scale ground-mount solar farm where FRP provides the decisive performance advantage covers four primary categories.

Sub-frame structural profiles. The structural sections — I-beams, C-channels, box sections, angle profiles, and flat bar — that form the sub-frame of the panel mounting system, connecting the primary pile-driven posts to the panel rail system above. These sections sit at or just above ground level, in direct contact with the highest-humidity, highest-corrosion-risk zone of the installation. FRP pultruded profiles to BS EN 13706 deliver the load capacity required for panel dead load, wind uplift, and snow load, without the corrosion liability of equivalent steel sections.

Cable trays and cable management. DC cabling from panel strings to combiner boxes, and from combiners to inverters, requires cable tray management across the full extent of the site. On a large installation, this represents kilometres of cable tray routing at ground level through the most corrosively demanding zone. FRP cable trays to BS EN 61537 provide corrosion-immune, non-conductive cable management that requires no maintenance over the operational life of the installation, no earthing and bonding programme, and no recoating schedule.

Maintenance walkways and access grating. Safe technician access between panel rows for cleaning, inspection, and maintenance requires dedicated walkway systems that protect the ground surface beneath and provide anti-slip footing in wet conditions. FRP moulded grating walkways provide lightweight, corrosion-resistant, anti-slip access panels that can be installed without penetrating the ground membrane and without adding meaningful structural load to the installation.

Drainage channels. Water management around the panel array — preventing erosion at the base of mounting posts, managing runoff between panel rows, and directing surface water away from cable management infrastructure — requires drainage systems that perform without corrosion-driven degradation in direct soil contact. FRP drainage channels provide maintenance-free performance in this role throughout the full operational life of the farm.

The Cost and Lifecycle Case: What the Numbers Show

FRP secondary infrastructure carries a higher upfront material cost than galvanised steel — typically 1.5x to 2x depending on the section and specification. On a large ground-mount installation where secondary material costs represent a meaningful budget line, this premium is visible and requires justification. The justification is straightforward when the correct cost comparison is made.

A galvanised steel secondary infrastructure specification on a 30-year ground-mount installation in a UK coastal or agricultural environment carries, in addition to the lower upfront cost: an inspection programme every two to three years across potentially hundreds of hectares of site; recoating interventions at the points where zinc coating has failed, requiring site access, specialist labour, and materials; structural assessment at 15 years as coating loss and base metal corrosion reduce the structural cross-section of bearing elements; and partial or full replacement of sections that no longer meet structural requirements, at a cost substantially exceeding the original installation and requiring disruption to a live generating asset.

An FRP secondary infrastructure specification on the same installation carries: a periodic visual inspection programme. Nothing else.

The break-even point — where FRP's lower maintenance cost has fully offset its higher upfront material cost — typically falls within 8 to 12 years of installation (Creative Fibrotech, 2025). For a 30-year ground-mount solar farm, that means the substantial majority of the operational period — 18 to 22 years — is spent in net positive territory for FRP. A peer-reviewed lifecycle cost analysis comparing GFRP and conventional steel over a 100-year study period found approximately 50% cost savings in favour of GFRP, driven primarily by the elimination of corrosion-related maintenance and replacement (Younis, Ebead and Judd, 2018).

For developers and EPC contractors delivering ground-mount solar farms against tight programme and budget constraints, FRP secondary infrastructure is not an upgrade specification. It is the rational lifecycle cost decision — and the one that most closely aligns the secondary infrastructure specification with the 30-year financial model the asset is built around.

The break-even point between FRP and steel secondary infrastructure on a ground-mount solar farm typically falls within 8 to 12 years. For a 30-year asset, the majority of the operational life is spent in net positive territory for FRP.

The UK Pipeline: Why This Decision Matters Now

The scale of the UK's ground-mount solar construction pipeline makes the secondary infrastructure specification decision more consequential than at any previous point in the sector's history. With 4.2 GWp currently under construction, an average project size of 35 MWp across the 75 projects completed in 2025, and nearly 6 GWp of approved NSIPs in the development pipeline, the volume of secondary infrastructure being specified and procured across the UK solar development community in 2026 is unprecedented (Solar Power Portal, 2026).

Projects being commissioned in 2026 will be operational into the 2050s. The secondary infrastructure specification decisions being made now by EPC contractors, procurement teams, and asset owners will determine the maintenance cost profile of those assets for three decades. The corrosion risk to galvanised steel in outdoor, ground-level, UK climate conditions is well documented and well understood. The FRP alternative that eliminates that risk is available, certified, and increasingly standard specification across the industries — water treatment, offshore, chemical processing — where the combination of long asset life, demanding environment, and high maintenance access cost has already made the lifecycle case undeniable.

The UK ground-mount solar sector is now large enough, and the pipeline long enough, that it belongs in the same category.

Reinforce Technology FRP Products for Ground-Mount Solar

Reinforce Technology supplies FRP structural profiles, cable trays, grating walkways, and drainage systems for ground-mount solar farm applications across the UK and internationally. Our products are manufactured in ISO 9001, ISO 14001, and ISO 45001 certified facilities and supplied to BS EN 13706 for structural profiles and BS EN 61537 for cable tray systems.

FRP solar PV sub-frame profiles — pultruded I-beams, C-channels, box sections, and angle profiles for ground-mount sub-frame applications. Available in polyester, vinyl ester, and epoxy resin systems. UV-stable formulations rated for continuous outdoor exposure across the full operational life of the installation.

FRP cable trays and cable management — non-conductive, corrosion-resistant cable tray systems for DC cable routing across ground-mount sites. Snap-fit and bolt-together systems that eliminate welding and hot work permit requirements. No earthing or bonding programme required.

We work with solar developers, EPC contractors, and procurement teams across the UK's ground-mount solar pipeline. Contact us for technical data sheets, load and span calculations, resin system recommendations, and project-specific guidance.

As with any structural or infrastructure material, final confirmation of suitability for a specific ground-mount solar application remains the responsibility of the appointed project engineer. Reinforce Technology provides technical guidance and material recommendations based on the information supplied to us, but specification sign-off should always sit with the qualified professional responsible for the design. We are happy to provide full technical data sheets and application-specific support to assist with that process.

References

Aeron Composite (2025) FRP/GRP Module Mounting Structure for Solar Panels. Available at: https://www.aeroncomposite.com/frp-grp-solar-application.html [Accessed: April 2026].

Alttower (2025) The Advantages of Using Fiberglass Reinforced Plastic (FRP) for Solar Mounting Structures. Available at: https://www.alttower.com/blog/the-advantages-of-using-fiberglass-reinforced-plastic-frp-for-solar-mounting-structures_b24 [Accessed: April 2026].

Creative Composites Group (2025) Cost Savings of Choosing FRP. Available at: https://www.creativecompositesgroup.com/blog/cost-savings-of-choosing-frp [Accessed: April 2026].

Creative Fibrotech (2025) FRP vs Steel Cost: Complete Analysis for 20 Year Projects. Available at: https://creative-fibrotech.com/frp-vs-steel-cost/ [Accessed: April 2026].

House of Commons Library (2026) Planning for Solar Farms. Available at: https://commonslibrary.parliament.uk/research-briefings/cbp-7434/ [Accessed: April 2026].

Income Pultrusion (2025) FRP Solar Structures: Efficient Mounting Solutions for Solar Panels. Available at: https://incomepultrusion.com/frp-solar-structure/ [Accessed: April 2026].

Solar Power Portal (2026) UK Solar Construction Uptick, 800MWp Deployed in Q1. Available at: https://www.solarpowerportal.co.uk/solar-projects/uk-solar-construction-uptick-800mwp-deployed-in-q1 [Accessed: April 2026].

Solar Power Portal (2026) UK Solar Forecast to Grow 50% YoY Again in 2026. Available at: https://www.solarpowerportal.co.uk/solar-projects/uk-solar-forecast-to-grow-50-yoy-again-in-2026 [Accessed: April 2026].

Younis, A., Ebead, U. and Judd, S. (2018) 'Life cycle cost analysis of structural concrete using seawater, recycled concrete aggregate, and GFRP reinforcement', Construction and Building Materials, 175, pp. 135–144. doi: 10.1016/j.conbuildmat.2018.04.183.