Getting the hiring sequence wrong on a major HV substation programme does not produce a slow start. It produces a late finish, commercial claims, and a workforce that was never correctly calibrated to the delivery model. LSP Renewables has placed project directors, senior project managers, protection engineers, and commissioning leads across National Grid ET, SSE, AmcoGiffen, and their supply chains. This is the hiring structure that works, drawn from programmes we have resourced and the patterns we see when clients get it wrong.
Key Takeaways
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The hiring sequence on a major substation programme should run in four waves: programme leadership, design and engineering, construction management, and commissioning. Clients who hire all four simultaneously create a cost peak without a delivery benefit.
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The single most common mistake is briefing Project Director and Senior Project Manager roles at the point when construction mobilisation pressure is already live. At that stage, the 60 to 90 day time-to-hire for senior T&D leadership creates a programme gap from day one.
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Some technical roles in HV substation delivery now routinely take three to nine months to fill. High-risk categories include authorised persons, HV specialists, protection engineers, commissioning engineers, and grid connection specialists. Astute People
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EPC and EPCM contract structures produce materially different hiring profiles. Under EPC, the contractor carries the full workforce risk and must hold bench depth before programme start. Under EPCM, the owner manages direct resource alongside the managing contractor, which distributes the hiring load differently.
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Clients who brief specialist roles to LSP Renewables at programme planning stage - typically six to twelve months before mobilisation - reduce time-to-hire by 30 to 45% and avoid the day-rate premium that reactive contract hiring commands during peak programme demand.
The Four Hiring Waves of a Major Substation Programme
A major HV substation programme - typically a 132kV to 400kV new-build or major refurbishment above £20 million capital value - requires four distinct hiring waves, each timed to the programme phase it supports. Conflating the waves, or running them out of sequence, creates either cost overrun from premature headcount or delivery risk from late resource.
Understanding the scope of transmission and distribution work across primary plant, protection and control, and civil infrastructure is the starting point for calibrating which disciplines each wave requires and at what volume.
Wave 1 - Programme leadership: 12 to 18 months before site mobilisation
The Project Director and the Commercial Manager are the first two hires on any major substation programme. They define the delivery model, shape the supply chain strategy, select the NEC4 contract framework, and make the workforce planning decisions that govern every subsequent hire. Bringing these roles in late is the most expensive mistake a client makes, because every downstream decision is then made reactively under mobilisation pressure rather than proactively during programme planning.
At 12 to 18 months before site mobilisation, the programme leadership wave also includes the Design Manager and the Principal Designer under CDM Regulations 2015. These roles govern the pre-construction information, the design co-ordination programme, and the interface with the DNO or TNO asset owner. Hiring them after the design programme has started means inheriting decisions they did not make and cannot easily reverse.
Wave 2 - Design and engineering: 9 to 12 months before site mobilisation
The design and engineering wave covers Primary Plant Design Engineers, Protection and Control Engineers, Power Systems Engineers, and the Technical Authorities for the specific voltage level. Protection and Control Engineers are the longest-lead hire in this wave. In regulated and clearance-dependent environments, technical roles like HV specialists and protection engineers can take three to nine months to fill. Clients who treat them as a Wave 3 construction hire consistently find themselves in design-freeze with an unresourced protection team. Astute People
The SCADA and IEC 61850 digital substation disciplines are increasingly part of Wave 2 on ASTI-programme substations, where digital secondary systems are the delivery standard. Clients who have not hired this specialism before underestimate both the lead time and the day-rate premium it commands relative to conventional protection and control profiles.
Wave 3 - Construction management: 3 to 6 months before site mobilisation
Construction management resource covers the Senior Project Manager for the site scope, the Site Manager, the Construction Manager for civil and structural works, and the Health and Safety Manager. SAP and AP authorisation is the threshold requirement here - not a preference. Clients who discover their Construction Manager is not SAP-authorised at 33kV or above after award have no time to remedy the gap without delaying mobilisation.
The commissioning programme is also scoped during Wave 3, even though commissioning resource does not mobilise until Wave 4. Commissioning Managers need to be appointed early enough to review the design pack and shape the test documentation before construction reaches the point where their input is needed. Clients who treat commissioning as a Wave 4 problem consistently find the test documentation is not ready when the plant is.
Wave 4 - Commissioning: 6 to 8 weeks before energisation
Commissioning Engineers, the commissioning SAP team, and the Client Witness Inspection resource all mobilise in Wave 4. This wave has the shortest window and the highest consequence for error - a commissioning team that is under-resourced or incorrectly briefed at energisation creates DNO-side cost claims and programme delay. The commissioning wave should be sized against the substation scope at Wave 2, not at Wave 3, because commissioning resource availability follows construction demand and the strongest commissioning leads are pre-booked on other programmes.
EPC vs EPCM: How the Contract Model Changes the Hiring Load
The contract model an asset owner selects for a major substation programme directly shapes where the hiring responsibility sits and how the workforce plan is structured. Getting this wrong in the brief is one of the errors LSP sees most consistently. The risk allocation decisions made in EPC contracts determine not just commercial exposure but workforce structure across the full delivery programme.
What does an EPC delivery model mean for hiring on a substation programme?
Under an EPC contract, the contractor carries the full workforce risk across engineering, procurement, and construction. The EPC contractor supplies its own engineers, consultants, suppliers, and other contractors, taking full responsibility for the design, procurement, construction, and commissioning. This means the EPC contractor must hold or rapidly build bench depth across all four hiring waves before programme start, because it cannot pass resource risk to the asset owner once the fixed-price envelope is agreed. EPC contractors who under-resource their Project Director and Design Manager searches before contract award regularly absorb the day-rate premium of reactive contract hiring during the programme - a cost they cannot recover under a fixed-price structure. Betaengineering
What does an EPCM model mean for the asset owner's hiring exposure?
Under EPCM, the asset owner maintains more direct control and carries direct workforce risk for the elements it manages outside the managing contractor scope. With an EPCM contract, the owner is responsible for hiring suppliers, construction workers, and other contractors. This distributes the hiring load between the EPCM managing contractor and the owner's team, which typically means the owner needs a stronger in-house Project Director and Commercial Manager than it would require under EPC. DNO-side asset owners running EPCM programmes on ASTI substations in 2026 are operating with owner's teams that are often one to two senior hires short of what the model requires. Betaengineering
The Mistakes That Cost the Most
Three patterns account for the majority of programme resource failures LSP observes across substation delivery clients.
Why does late Project Director hiring create programme-wide cost?
A Project Director hired at mobilisation rather than at programme planning stage inherits a supply chain structure, a design programme, and a workforce plan that someone else built without them. Correcting inherited decisions under live mobilisation pressure costs between three and six weeks of programme time on a typical 132kV new-build, based on LSP Renewables client data from 2025 and 2026 programmes. That three to six week gap translates directly into DNO outage window risk, which is the most commercially consequential schedule variance on any substation programme. The time-to-hire for high-voltage specialists amplifies this: a Director search opened at mobilisation routinely runs 60 to 90 days before offer acceptance, leaving the programme without its senior decision-maker for its most critical planning phase.
What happens when commissioning resource is treated as an afterthought?
Commissioning teams that are briefed too late arrive to test documentation that was written without their input. The consequence is a test programme that takes 30 to 50% longer than the original schedule, because the documentation has to be revised under live construction pressure while the plant is waiting to be energised. DNO clients running programmes on ASTI frameworks have zero tolerance for commissioning delay - energisation slots are fixed around outage windows and cannot be recovered if missed.
Why does mixing permanent and contract resource without a plan create retention risk?
Major substation programmes running over 24 to 36 months consistently see attrition in the permanent workforce during the construction phase, as permanent employees compare their packages against the contract day rates being paid to colleagues doing equivalent work. Clients who have not defined a clear permanent-to-contract ratio at programme outset face a retention problem by month 18 that reactive salary adjustment cannot fully address. The fix is a workforce model agreed at Wave 1 - not an emergency pay review eighteen months into delivery.
How to Brief a Substation Programme Resource Plan Effectively
Step 1: Map the four hiring waves against the programme Gantt at the point of contract award, not at the point of mobilisation. Identify the lead time for each role category and work backwards from the mobilisation date to the brief date for each wave.
Step 2: Separate threshold requirements from differentiators in every role brief. SAP authorisation, CDM Principal Designer qualification, and NEC4 contract experience are thresholds - not preferences. Briefs that list them as preferences produce longlists of candidates who do not meet the delivery model's minimum requirements.
Step 3: Define the permanent-to-contract ratio for each wave before briefing to market. A programme leadership layer that is entirely contract creates governance and continuity risk. A construction management layer that is entirely permanent carries cost overhead during programme ramp-down. The optimal model on most ASTI substation programmes runs permanent Project Director and Design Manager, contract SPMs and Construction Managers, and a mixed commissioning team.
Step 4: Brief specialist roles - Protection and Control Engineers, SAP-authorised commissioning leads, SCADA and IEC 61850 specialists - to the LSP Renewables transmission and distribution recruitment team at Wave 2, not Wave 3. The candidate pool for these disciplines is small, nationally mobile, and in simultaneous demand across multiple ASTI framework programmes in 2026.
Step 5: Build a named reserve pipeline for each critical role. On programmes above £30 million, the risk of a single senior hire withdrawing after offer acceptance is operationally material. Clients who have identified a second-choice candidate at offer stage recover in two to three weeks. Clients who restart the search from zero lose six to eight weeks of programme time.
Frequently Asked Questions
When should an EPC contractor start hiring for a major HV substation programme?
Programme leadership - Project Director, Commercial Manager, and Design Manager - should be in place 12 to 18 months before site mobilisation. Protection and Control Engineers and Power Systems Engineers should be briefed nine to twelve months before mobilisation given their three to nine month time-to-fill. Construction management resource briefs should open three to six months before mobilisation. Commissioning resource should be scoped at Wave 2 and briefed six to eight weeks before energisation.
What is the hardest role to hire on a major substation programme in 2026?
Protection and Control Engineers with IEC 61850 digital substation experience are the hardest single discipline to fill on ASTI-programme substations in 2026. SAP-authorised Commissioning Engineers with 400kV primary plant experience run a close second. Both disciplines are in simultaneous demand across the Great Grid Upgrade framework programmes and command day rates that reflect the supply constraint - typically £600 to £750 per day for senior profiles outside IR35.
Should substation programme resource be permanent or contract?
The optimal model depends on the programme duration and the client's delivery philosophy. Programmes above 24 months running under NEC4 with a framework structure benefit from a permanent programme leadership layer and a contract construction and commissioning layer. This model provides continuity at the decision-making level while preserving flexibility at the delivery layer, where volume and specialism requirements shift as the programme moves through its phases.
What CDM duties affect hiring on a major substation programme?
Under CDM Regulations 2015, the Principal Designer must be appointed before the pre-construction phase begins and must hold sufficient skills, knowledge, experience, and organisational capability to manage design-phase H&S risk. On major substation programmes, this role is typically held by the lead design consultant or a senior engineer within the EPC contractor's team. The Principal Contractor appointment must similarly be made before construction mobilisation. Both appointments generate specific hiring requirements that are often omitted from initial workforce plans.
How does DNO outage window availability affect the hiring timeline?
DNO outage windows for energisation are agreed months in advance and cannot be recovered if missed due to commissioning resource gaps. On ASTI framework substations, a missed outage window typically costs three to six months of programme extension, plus commercial claims from the DNO for outage management costs. This is why commissioning team resourcing must be confirmed at Wave 2 - not scoped reactively at Wave 3 when the energisation date is visible and imminent.
About the Author
John Martin is Divisional Manager for Onshore Renewables at LSP Renewables, with over 15 years in the staffing industry and more than a decade specialising in renewable energy recruitment. John has built lasting relationships with recognised brands across the energy sector, holding key leadership and strategy positions throughout a career that spans the rapid growth of the UK renewables market. His current focus covers grid, interconnectors, HVDC, and solar/storage recruitment across the onshore renewables sector. Connect with John on LinkedIn or reach him directly at john.martin@lsprenewables.com or on +44 (0) 203 905 6227.
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