
We plan optimal alignments for transmission lines across varied terrain, balancing engineering, land access, environmental, cultural, and constructability constraints. Our process draws on aerial imagery, LiDAR, site visits, and constructability assessments to define feasible corridors that reduce risk and ease future maintenance.
From new build “greenfield” routes to major upgrades of existing “brownfield” lines. Our overhead line design services span voltages from 11kV to 500kV. Our teams combine structural and electrical design expertise in-house, using PLS-CADD and the Power Line Systems suite to model complete systems, support construction readiness, and deliver optimised, constructible, standards-compliant solutions for network owners, developers, and independent connection providers worldwide.
Our engineers have designed overhead lines in some of the most demanding operating environments in the world, from remote terrain and extreme weather conditions to densely populated urban corridors and sensitive heritage landscapes. That depth of experience means we don't just produce compliant designs; we produce designs that work in the real world, built for the people who have to construct and maintain them.
We integrate structural and electrical analysis from the outset, eliminating the interface risk that arises when these disciplines are managed separately. Our PLS-CADD models are built to be transferable, documented, version-controlled, and formatted for ongoing use by your asset management team so you retain a live, maintainable design record long after project close-out.
Overhead Line Design, Structure Design
Overhead Line Design, Line Route Design, Electrical Design
Optioneering, Feasibility, Detailed Design & Contractor Design Design, CAD, Consulting & Geotechnical Investigations
Managing the greenfield Cabling Design and the interface between the Utility and cable installation supplier.
Detailed Design & Construction Design construction CAp drawings inc temp works
Drafting and PLS-CADD Services, Verifications and Peer reviews. Overhead Line Design
Optioneering, Feasibility, Detailed Design & Geotechnical, design, CAD and SI
Groundline’s innovative Catenary Support System enabled the safe replacement of transmission conductors across busy motorways, schools, and residential areas in Auckland. Delivered on time, within budget, and with minimal disruption, the project was recognised as a finalist in Transpower’s STAR Awards for Safety by Design.

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