Overhead line projects delivered with confidence

DNV provides the basis for decisions on technical solutions and layouts for new and renewed HVAC and HVDC overhead lines, supports tendering and execution phases, and offers independent QA/QC reviews covering overhead line projects across the lifecycle.

Constructing a new high voltage overhead line spans feasibility to specification, bid assessment, and final delivery/acceptance, requiring state-of-the-art electrical, mechanical, structural and civil expertise. Utilities must expand capacity with solutions that are socially acceptable and financially efficient while technically reliable; and for large T&D projects, independent QA/QC helps ensure requirements are met and problems are avoided later.

About DNV’s overhead line services

DNV supports feasibility, conceptual design, routing/tower spotting and tender documentation for new and renewed overhead lines, and provides independent QA/QC reviews from conceptual design through commissioning.

• Advisory: Supporting overhead line projects from early feasibility through design and procurement by delivering technical and economic assessments for new and upgraded lines, conceptual design and solution ranking, and optimized line routing and tower spotting, complemented by preparation of detailed designs and tender specifications with bid evaluation and quality assessment; combined with expertise in uprating and upgrading solutions—such as HTLS conductors, voltage increases or AC/DC conversion—and comprehensive engineering covering tower families, foundations, conductors, insulators, fittings, vibration damping, and assessment of EMF and audible noise to ensure robust, efficient, and future-ready line performance.
• Verification: Providing independent QA/QC across all project phases—including specification review, tendering and bid evaluation, design review, and oversight of manufacturing, installation, and commissioning—to ensure compliance with technical requirements, complemented by project-level QA/QC support where DNV acts as owner’s or lender’s engineer, delivering structured reporting on progress, deviations, and overall project performance.
• Resilience add-on: DNV’s Emergency Restoration System (ERS) provides a rapidly deployable, temporary overhead line solution designed to restore power transmission capability within hours across any landscape and weather conditions, using modular towers and efficient logistics to minimize downtime and operational risk; widely deployed by TSOs and contractors, the system is supported by decades of experience and proven global use for outage recovery, temporary capacity, and grid resilience.

Decision-grade documentation for technical solutions, layouts and tendering/execution.

Independent QA/QC evidence and recommendations supporting risk-informed accept/repair/replace decisions (where quality issues occur).

Why DNV

DNV brings broad experience across overhead line projects spanning voltage levels and both AC and DC systems, providing technically sound advice throughout all phases of development and construction, complemented by strong QA/QC capabilities across T&D project types - including overhead lines - to ensure consistent quality, reliability, and compliance from design through delivery.