High-Voltage Design
Tetra Tech delivers innovative and reliable high-voltage (HV) design solutions by partnering closely with clients to optimize system performance, ensure regulatory compliance, and accelerate project delivery.
Tetra Tech supports clients through every stage of the project life cycle, from early planning and system studies to detailed design and construction support. We provide cost-effective, reliable solutions for transmission, substation, and interconnection projects across both alternating current (AC) and high-voltage direct current (HVDC) systems. With one of the largest and most experienced high voltage engineering benches in the industry, we offer clients immediate access to specialized expertise without long onboarding delays. They can feel confident that schedules and deliverables will stay on track with our ability to rapidly scale teams, deploy subject matter experts, and integrate new staff seamlessly into active projects.
We are actively delivering major HVDC and advanced transmission projects across North America, Europe, and Australia, giving our engineers firsthand experience with the latest technologies, standards, and utility requirements. This active involvement enables us to bring proven, practical knowledge—not just theoretical capability—to every client engagement. Because we perform complex technical studies and modeling internally, we can move quickly from concept to design, maintaining continuity, accuracy, and speed throughout the project. Combined with our focus on constructability, lifecycle value, and standardization, we help clients reduce risk, optimize capital investment, and advance grid modernization and renewable integration initiatives.
Tetra Tech offers clients a reliable partner for even the most complex high voltage design challenges, backed by a deep talent pool, real-world HVDC delivery experience, and adaptable project teams.
HVDC Converter Station Design
From conceptual studies to detailed design, we provide specialized engineering support across the full HVDC life cycle for converter stations, cable systems, and system integration. Our team brings deep technical expertise and project experience to optimize performance, reliability, and cost for HVDC transmission solutions.
Substation Design
We deliver comprehensive substation engineering services covering greenfield and brownfield projects, including site layout, physical design, protection and control, grounding, and equipment specifications. Our in-house multidiscipline team ensures seamless coordination and tailored designs that meet utility and regulatory standards.
Transmission Line Design
Our transmission line team delivers safe, resilient, and cost-efficient overhead and underground solutions by combining advanced modeling tools with practical, field-proven engineering. We provide adaptable designs up to 765 kilovolts (kV) that meet evolving grid and utility demands.
- Route selection and evaluation
- Structure design and optimization
- Line optimization and capacity upgrades
- Thermal rating analysis (static and dynamic)
- Foundation design and geotechnical coordination
- Line modeling and PLS-CADD analysis
- Overhead and underground line design
Distribution Design
We deliver agile, scalable distribution engineering solutions tailored to modern grid needs and customer timelines. Our team supports utilities and developers with reliable designs that integrate new technologies, improve system performance, and streamline project execution.
- Overhead and underground distribution design
- Load analysis and system studies
- Asset renewal and system upgrades
- Distributed energy resource (DER) integration
- Design work required before system changes can be made
- Protection and coordination reviews
- Reliability and resiliency improvements
Protection and Control
We provide comprehensive protection and control engineering solutions that ensure the safe, reliable, and efficient operation of electrical systems. Our team develops protection philosophies, relay coordination strategies, and automated control designs that safeguard critical assets and maintain system stability under normal and faulted conditions., We help clients minimize downtime, enhance system observability, and strengthen overall grid resilience by integrating advanced technologies, performing rigorous analysis, and supporting thorough testing and commissioning.
Arrangement
We deliver detailed physical and electrical arrangement designs for substations and switchyards that balance performance, safety, constructability, and long-term usability. Our approach ensures layouts are space-efficient, intuitive for operations and maintenance staff, and adaptable to future expansion needs. We produce arrangement designs that support reliable project execution from concept through commissioning through thoughtful equipment positioning, clear routing strategies, and alignment with client standards and site constraints.
HV Design Studies
Our engineers conduct a full range of system studies to inform design decisions and ensure grid reliability. Using advanced modeling tools, we deliver data-driven insights that support planning, compliance, and operational excellence for both new installations and system upgrades.
- Load flow analysis
- Short-circuit analysis
- Arc flash assessment
- Grounding analysis
- Insulation coordination analysis
- Equipment rating and thermal assessments
Data Centers
Our data center team supports mission-critical facilities by delivering resilient, high-performance power and infrastructure solutions that ensure reliability under all operating conditions. We perform power feasibility assessments and design scalable, future-ready systems that maximize uptime, improve energy efficiency, and adapt to evolving capacity and technology demands, helping owners meet today’s needs while preparing for long-term growth.
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