When building data centers, power reliability is non-negotiable. Substations, which convert high-voltage electricity into usable power, are critical. Choosing the right EPC (Engineering, Procurement, and Construction) partner ensures projects stay on schedule and within budget. Here's why this matters:
Key insights include defining project scope early, selecting EPCs with proven experience, and choosing the right delivery model (EPC, Design-Build, or EPCM) to minimize risk and maximize efficiency.
For data center owners, a clearly defined project scope is essential to secure accurate EPC (Engineering, Procurement, and Construction) proposals. Vague or incomplete requirements lead to flawed proposals, budget issues, and project delays - challenges that are even more pronounced given today’s evolving energy infrastructure demands.
Start by breaking down your power needs into specific phases: day-one critical load, contracted tenant load, and long-term expansion plans. These distinctions are critical because utilities rely on this data for system impact studies, while EPCs use it to design infrastructure that meets both immediate and future demands. For example, if a facility plans to scale from 50 MW to 150 MW within five years, the substation must be designed to handle that eventual capacity, not just the initial load.
Redundancy configurations also need to be addressed early in the planning process. For facilities in the 50–100 MW range with multiple buildings, a Ring Bus configuration is a common choice. On the other hand, hyperscale sites requiring 100–300 MW often employ a Breaker-and-a-Half scheme. This decision impacts everything from the number of transformers to protection system complexity, as well as the overall cost and physical footprint of the project [8].
Physical site constraints must also be carefully considered. These include transformer pads, oil containment systems, control houses, fire access lanes, stormwater management, and security fencing. A poorly planned site layout can lead to significant challenges later.
"The substation is often the gating item between a controlled land parcel and a deliverable data center." - Build Team [1]
By clearly defining these elements, data center owners provide EPCs with the foundation they need to create an accurate and actionable project plan.
Once the project scope is well-defined, a detailed data package is essential for EPCs to develop a reliable proposal. At a minimum, this package should include items such as a conceptual site plan, electrical one-line diagrams, a cooling basis of design, and a backup power narrative. The narrative should specify whether onsite generation - whether diesel, battery, or fuel cell - will operate in parallel with the grid or independently [7].
Here’s a summary of the core inputs EPCs require:
| Input Category | What to Provide |
|---|---|
| Electrical Parameters | Voltage class (e.g., 12.47 kV to 138 kV), MVA capacity, equipment ratings |
| Load Profile | Phased MW demand, ramp schedule by year, redundancy level (e.g., N+1 or 2N) |
| Site Data | Land footprint, setbacks, geotechnical data, drainage requirements |
| Equipment | Long-lead item list (transformers, breakers), preferred manufacturers |
| Regulatory/Utility | Interconnection agreements, permit constraints, utility standards |
A detailed ramp schedule is particularly important. This should outline the year-by-year activation of MW capacity to minimize procurement risks. Without it, EPCs are forced to make assumptions about sequencing, which can lead to delays and cost overruns. For instance, current lead times for transformers range from 60 to 120 weeks, while switchgear lead times are between 40 and 65 weeks [2].
"The developers waiting for design completion before ordering are the ones delivering 18 months late." - Build Team [2]
Once you've finalized your project scope and assembled a solid data package, the next step is identifying an EPC firm that can deliver on your requirements. This isn't just about picking a company with a flashy brochure - it’s about ensuring their skills and experience align with your project's critical needs. A thorough technical and project-specific evaluation is essential.
At a minimum, the EPC should have in-house licensed Professional Engineers (PEs) who can not only sign off on high-voltage designs but also identify cost-efficient solutions without compromising utility standards. Look for firms experienced across a range of voltage classes, from 69 kV to 765 kV, and capable of handling both open-air and Gas Insulated Substation (GIS) designs. Such versatility is especially important for large-scale projects like hyperscale data centers [9].
Equally important is Protection and Control (P&C) expertise. Missteps in relay selection or bus configuration can jeopardize grid reliability. The EPC should also demonstrate experience with utility coordination. This can be verified through documentation like interconnection queue records, responses to system impact studies, and familiarity with regulatory frameworks such as PJM and FERC [9].
"Tangibl understands not just the technical requirements of a data center with respect to utility interconnection, but also the evolving regulatory environment at PJM and FERC - including Connect and Manage, co-located load rules, and related FERC proceedings." - Ken Foladare, Director of RTO and Regulatory Affairs, Tangibl Group [9]
The table below outlines the key qualification areas to assess during your screening process:
| Qualification Category | Criteria |
|---|---|
| Engineering | Licensed PEs, 3D design capability, seismic/geotechnical expertise |
| Regulatory | NERC compliance, FERC/ISO/RTO experience, FAC-008 facility ratings |
| Technical | Protection & Control (P&C), SCADA/HMI, grounding and lightning studies |
| Testing | NETA-certified testing, commissioning levels L1–L5, FAT/SAT oversight |
| Project Delivery | Full EPC turnkey capability, factory-built substation options |
Once you've confirmed technical qualifications, the next step is to evaluate the EPC's proven ability to deliver on similar projects.
Technical credentials are just the beginning. A strong track record is critical for predicting future success. Instead of generic marketing materials, request project-specific documentation such as single-line diagrams, redundancy narratives, protection studies, and Basis of Design (BOD) documents [11].
For example, in June 2025, NV5 Global secured a $5 million contract to design high-voltage substations for data centers in Georgia and Nevada. Their scope included relay settings, SCADA/HMI programming, and power system studies for substations operating between 120 kV and 345 kV. This level of detail - covering voltage class, scope, and location - shows their readiness to handle mission-critical demands. NV5 CEO Ben Heraud commented: "Our expertise allows us to meet the complex requirements of high-reliability environments such as data centers with integrated power infrastructure solutions." [10]
Another key factor is commissioning ownership. Firms that manage commissioning in-house - providing functional test scripts, integrated systems test (IST) summaries, and issue logs - are typically more accountable. On the other hand, outsourcing this phase often leads to submittal quality issues, which can signal costly field rework later on [5].
Lastly, ask for references from at least three projects of similar MW scale and facility type. Keep in mind that general commercial electrical experience doesn't necessarily translate to mission-critical substation work. Also, don’t be swayed by a single high-profile project - it’s important to confirm the firm has consistently delivered on similar projects [11].
Data Center Substation Delivery Models Compared: EPC vs Design-Build vs EPCM vs DBB
After evaluating EPCs for their technical expertise, the next step is structuring your contract. The delivery model you choose plays a major role in determining your project's timeline, budget predictability, and how much risk you, as the owner, will bear. When it comes to substation construction for data center projects, selecting the wrong delivery model can lead to delays or jeopardize your utility interconnection. By building on your technical screening, the right delivery model helps reduce risks and ensures timelines stay on track.
There are four main delivery models to consider: Design-Bid-Build (DBB), Design-Build (DB), EPC (Engineering, Procurement, and Construction), and EPCM (Engineering, Procurement, and Construction Management). Each model strikes a different balance between how much control the owner retains and how much risk they take on.
Design-Bid-Build is a traditional approach where design and construction are handled in separate, sequential phases. While straightforward, this model can lengthen the overall schedule. If field conditions differ from what’s shown in the drawings, disputes between the designer and contractor are common, leading to delays. For mission-critical substation projects, this risk can be costly.
EPC, on the other hand, is at the opposite end of the spectrum. It consolidates design, procurement, and construction under one firm. This is often the go-to model for complicated power infrastructure projects because it can reduce schedules by 20–30% compared to DBB [14]. Additionally, most of the cost and schedule risks shift to the contractor, making it an attractive option. With procurement comprising 50–60% of an EPC’s value, schedule efficiency is crucial, especially when transformer lead times range between 60 and 120 weeks [2][14][15].
"In mission-critical environments, execution certainty matters more than lowest initial price." - Industrial Accessories Company (IAC) [18]
A real-world example highlights the time-saving potential of EPC. In 2018, Beaches Energy Services faced the challenge of replacing a failed autotransformer at its Sampson Substation in Florida. A similar project completed in 2017 under a DBB model took three years. By switching to a Progressive EPC approach with Burns & McDonnell - where early engineering and open-book pricing established costs before finalizing a lump sum - the replacement was energized in just eight months [13].
| Delivery Model | Schedule Control | Owner Risk | Coordination Burden | Cost Certainty | Best Fit |
|---|---|---|---|---|---|
| EPC (Turnkey) | Very High (Parallel phases) | Low (Transferred to EPC) | Low (Single point) | Highest (Lump Sum) | Complex power/industrial projects |
| Design-Build | High (Overlapping phases) | Low | Low (Single point) | High | Fast-track buildings |
| EPCM | Moderate | High (Owner manages interfaces) | Very High | Low (Variable) | Experienced owners wanting vendor control |
| Design-Bid-Build | Low (Sequential) | High (Change order prone) | High (Multiple contracts) | Low | Simple, low-risk projects |
For most data center substation projects, EPC or Design-Build models are the best options. However, if you have a strong project management team and want to maintain vendor control, EPCM can be a viable choice - just be prepared for the added coordination responsibilities that come with it [16].
Once you've chosen a delivery model, it's time to assess the EPC's capacity to execute. Even the best contract structure won't matter if the firm lacks the workforce, procurement network, or operational strength to fulfill its commitments. For data center substation projects - where power and energy infrastructure timelines are already stretched thin by grid interconnection delays exceeding four years in key markets[1] - a single staffing issue or procurement misstep can derail the entire timeline.
Certain roles, like MEP and Commissioning Managers, often become bottlenecks for substation delivery. When evaluating an EPC, ask directly how many of these specialists they have available and whether they’re tied up with other projects.
An EPC's success heavily depends on its ability to secure experienced MEP and Commissioning Managers and its relationships with local subcontractors. Firms with strong ties to local electricians and pipefitters are better equipped to handle labor shortages than those relying on ad hoc arrangements. Also, examine their procurement practices. Reliable EPCs often place transformer orders early - sometimes as soon as site control is secured, even before permits, final designs, or lender approvals are in place[2]. Waiting for final design approvals to order equipment can lead to avoidable delays.
The quality of early submittals is another telling indicator. If the initial submittals are clean and accurate, it reflects a disciplined team. On the other hand, sloppy or incomplete submittals often signal future issues, such as frequent change orders and reactive project management[5].
Beyond staffing and procurement, consider the EPC's ability to scale operations for multi-phase or geographically dispersed projects.
For owners managing multi-phase campuses or portfolios across multiple regions, scalability is just as important as single-project execution. Early equipment orders can prevent delays, but consistent performance across phases requires more than just good procurement practices. Maintaining a regional workforce is essential for managing multi-phase projects effectively. Master agreements for phased work can help ensure consistent design standards while also providing flexibility to pivot if performance issues arise[6].
Consider this example: Black & Veatch implemented a progressive design-build approach for a hyperscale substation, cutting high-voltage circuit breaker wait times from 85 weeks to 48–65 weeks. This adjustment shaved three months off the project timeline[3]. Achieving such results demands a mature procurement network and the engineering resources to manage overlapping project phases.
When vetting an EPC for large-scale or portfolio-wide work, ensure they have permanent staff in multiple markets instead of relying solely on subcontractors in unfamiliar regions. Check their bonding capacity as well - multi-phase builds require significant financial backing, and an EPC operating at full bonding capacity might struggle to prioritize your project. Lastly, inquire about their use of AI tools for tracking milestones and procurement across concurrent projects[2]. At portfolio scale, manual tracking methods simply aren’t practical.
Once an EPC's scalability is confirmed, the next step is ensuring the schedule and budget are protected through well-structured contracts. In the high-stakes world of data center construction, where electrical systems can account for 45%–70% of total costs[4], clear and thorough contract terms act as a critical financial safeguard. But technical capabilities and scheduling alone won’t prevent delays - owner oversight and precise agreements are equally vital.
Surprisingly, most project delays don’t stem from technical issues. Instead, they arise from ambiguity. Poorly defined scopes, unclear responsibilities, and weak change management processes can bring a project to a standstill.
"The contract is your key tool for mitigating risk and minimizing the potential for disputes... the most important thing to keep in mind when negotiating contracts is the importance of clarity and specificity of language." - Laura Fraher, Partner and Co-chair of Power & Energy Construction, Barclay Damon[22]
For substation projects, certain contract provisions carry extra weight:
Additionally, operational technology (OT) security should be addressed by segmenting EMS and SCADA systems from corporate IT. Contracts should also define software bills of materials, patching protocols, and incident response SLAs[21]. To manage cost risks, contracts must clarify who absorbs unforeseen material price increases and how supply chain disruptions affect timelines. This protects both parties from financial exposure[20].
Lastly, disputes are inevitable, so include a three-step resolution process: negotiation, non-binding mediation, and binding arbitration. This ensures construction continues even during disagreements[22].
While solid contracts lay the groundwork, active owner involvement ensures those terms are followed. Owner-side teams, particularly MEP and Commissioning Managers, play a pivotal role in holding EPCs accountable and ensuring the facility is genuinely operational at handover - not just mechanically complete.
The distinction between mechanical completion, substantial completion, and commercial operation is critical. Each milestone reflects a different level of readiness, and contracts must define these terms precisely to avoid disputes about when the asset is truly revenue-ready[17]. A Commissioning Manager overseeing the Level 1–5 systems verification process ensures that the handoff meets operational standards.
Owner representatives also help manage real-time changes. For example, if a utility updates its protection standards mid-construction or a cybersecurity requirement shifts, the owner-side team can issue provisional directions to keep work moving while commercial terms are finalized[23]. Without this coordination, even minor changes could halt progress for weeks. Additionally, including audit rights in EPCM or Guaranteed Maximum Price (GMP) contracts gives owners visibility into procurement assumptions - critical for multi-phase projects across multiple markets[12][22].
Choosing the right EPC partner for a substation project isn’t just about ticking boxes - it’s a strategic decision that can make or break a project. As highlighted in this guide on power and energy infrastructure, the most successful project owners approach EPC selection thoughtfully, treating it as a cornerstone of their strategy rather than a mere procurement task.
The process starts with defining the scope early. Owners who prioritize Front-End Engineering Design (FEED) before awarding contracts can cut cost overruns by up to 20% and achieve estimate accuracy within ±10–15% [14]. From there, technical evaluation should focus on three essentials: licensed Professional Engineers with expertise in high-voltage systems, certified partnerships with manufacturers like Siemens, ABB, and Eaton, and a proven Level 1–5 commissioning process [19].
Timing is everything when it comes to procurement. With transformer lead times stretching from 60 to 120 weeks and switchgear deliveries taking 8 to 24 months in 2026, waiting until designs are finalized to place orders is a costly gamble [2][4]. Owners who commit to FEED and establish technical criteria upfront are better equipped to accelerate procurement, avoiding delays down the line.
The ideal EPC partner combines technical expertise with contractual accountability. Opting for a single EPC or Lump Sum Turnkey (LSTK) contract consolidates design, procurement, and construction responsibilities, transferring the risks of delays and cost overruns to the contractor. To further safeguard the project, owners should insist on milestone-based liquidated damages, clear force majeure clauses, and an actively involved owner's representative [14]. This blend of technical precision and robust contractual measures ensures that substation projects are delivered on time and within budget.
"A successful data center development depends as much on smart contracting as on technical execution." - Ryan Gilchrist and Ashley Sherwood, Partners, Seyfarth Shaw [6]
Before outlining the substation's scope, it's essential to establish a clear path to energized capacity. To do this, make sure you’ve secured four key elements:
Substation procurement often becomes the bottleneck in a project. To prevent delays, finalize your delivery model - whether it’s EPC (Engineering, Procurement, and Construction), design-build, or multi-prime. Additionally, assemble your core leadership team early, ensuring this is done before completing the designs. This proactive approach will help keep the project on track.
To assess an EPC's experience with high-voltage systems and commissioning, start by examining their project portfolio. Look for evidence of handling voltage ranges from 15 kV to 765 kV and their proficiency in areas like relay protection, control logic, and SCADA integration.
Ask for proof of their commissioning processes, such as structured protocols like L0–L6 testing, and ensure they rely on dependable document control systems to maintain accuracy and organization.
Finally, take the time to review their track record for safety performance, meeting schedules, and delivering precise as-built documentation on previous high-voltage projects. These factors provide a clear picture of their expertise and reliability.
To avoid potential delays, it’s crucial to order transformers and switchgear far earlier than usual construction schedules might suggest. Transformers, which can take anywhere from 128 to 160 weeks to arrive, should be purchased during the site control phase - long before final designs or permits are in place. Similarly, medium-voltage switchgear, with lead times of 40 to 65 weeks, also needs to be prioritized early in the process. Moving away from traditional just-in-time procurement and instead focusing on pre-specifying and placing orders well in advance is key to ensuring equipment is ready when needed.
