Unlocking Low-Carbon Megawatts and Megabytes: Why Construction Access Determines Deliverability for Solar Farms and Data Centres – Part 2

In large infrastructure projects, the critical path is typically associated with grid connections, procurement, or civil and electrical works. Yet, for solar farms and data centres, one of the most decisive, and often overlooked, determinants of deliverability are the construction routes and access. These are not secondary engineering considerations; they are fundamental to whether abnormal indivisible loads (AILs), plant, and materials can safely and legally reach a site.

When access is left too late, projects stall not due to technology or financing, but because the road network, structures, or regulatory requirements simply do not permit the movements required. Route feasibility is therefore not an operational detail; it is a front-end risk that belongs on the critical path.

Across a wide range of UK and Irish projects, several recurrent obstacles consistently undermine access planning:

Third-Party Land

• Optimal AIL routes often require temporary land take for manoeuvring or local widening
• Negotiations can take months and may conflict with agricultural seasons
• Refusals can force significant rerouting or engineering solutions

Urban Sections

• Tight bends, multi-arm junctions, and bus/cycle priority layouts can restrict STGO movements
• Works may require night-time deliveries, phased traffic management, or partial disassembly of street furniture
• Local authority approvals introduce additional lead time

Weak or Unknown Structures

• Many rural bridges and culverts were never assessed for modern STGO loads
• Load assessments, strengthening works, or complete avoidance may be required
• Utilities often run within or alongside structures, adding complexity

Narrow Rural Links

• Single-track roads cannot accommodate long trailers or meet-passing movements
• Temporary widening may trigger ecological surveys, planning applications, or land agreements
• Restricted visibility and bend geometry may eliminate routes entirely

Statutory Undertaker Constraints

• Overhead lines, ducts, chambers, gas crossings, and telecoms infrastructure can obstruct trailers
• Diversions carry long lead times and unpredictable costs
• Coordination across multiple undertakers magnifies risk

These choke points are not theoretical; they recur across the majority of grid-connected renewable and digital infrastructure projects.

Deferring route and access feasibility is a false economy. The consequences include:-

 
• Programme Slippage: AIL movements are often on the critical path, delays cascade into energisation dates
• Cost Escalation: Unplanned bridge strengthening, widening, or statutory undertaker diversions
• Planning Risk: Authorities may impose restrictive conditions or request further assessment.
• Community and Reputational Impact: Poorly managed traffic movements generate resistance.

Ignoring access risk undermines not only construction timelines but also the credibility of the project.