Overhead HT transmission & distribution lines, 11kV to 66kV.
Royal Infra Projects surveys, builds and commissions the overhead high-tension lines that carry power from the grid into a distribution network — tower and pole foundations, conductor stringing, insulation and earthing, executed to the approved line schedule and tested before energisation.
From route survey to a live conductor overhead.
An overhead line is only as reliable as the route it follows and the foundations it stands on. We walk and survey the alignment, secure right-of-way clearance, and plan tower or pole spacing and conductor sag-tension before a single foundation is cast — so the line is built once, to specification.
- Route survey & alignment — ground survey, right-of-way assessment and span planning for the approved route.
- Foundation & structure erection — tower or pole foundation casting and erection to design loading.
- Conductor stringing — ACSR/AAAC conductor stringing under controlled tension, with sag verified against the stringing chart.
- Insulation & hardware — insulator string fitting, jumpers, anti-climbing devices and line hardware to specification.
- Earthing & protection — tower footing earthing and lightning protection where the route or structure requires it.
- Testing & energisation — pre-energisation checks and handover under utility permit.
Lines don't stand alone — they tie into a network.
Every overhead line we build is designed to connect cleanly into the rest of the network, whether that means a new feeder bay, an existing substation, or a planned underground conversion.
Substation & feeder bay tie-in
Lines are routed and terminated to match the receiving substation's bay configuration, so the handover from overhead line to switchgear is planned in from the start. See substations & feeder bays →
Overhead-to-underground conversion
Where a corridor needs to move underground, we handle the full transition — route survey, trenching, underground cable laying and re-termination.
RMU & DTR connections
Distribution-level lines are brought into ring main units and distribution transformers built on utility-approved foundations.
The rest of the network we build.
66kV Substations & Feeder Bays
Bus systems, switchgear bays, protection panels and control rooms from 11kV to 66kV.
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Street Lighting & Public Infrastructure
LED street lighting, pole erection, feeder pillars and smart lighting controls.
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Industrial Electrification & Smart Energy Management
Internal HT/LT distribution, power factor correction and energy monitoring that cut costs.
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Solar & Renewable Energy Integration
Rooftop and ground-mount solar EPC, grid interconnection and hybrid-ready systems.
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Energy Audit & Efficiency Solutions
Electrical energy audits and loss-reduction programmes for municipalities and government.
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Common questions on this capability
What voltage classes do you build overhead transmission lines for?
We survey, erect and commission overhead HT transmission and distribution lines from 11kV through 33kV up to 66kV, including tower and pole foundations, conductor stringing and line testing before energisation.
Do you handle the civil works for transmission line towers as well as the electrical stringing?
Yes. Foundation excavation and casting, tower or pole erection, earthing and civil reinstatement are executed by our own crews, with conductor stringing, insulator fitting and commissioning carried out to the approved line schedule.
Can you convert an existing overhead line to an underground cable route?
Yes, overhead to underground conversion is one of our core capabilities, including route survey, trenching, cable laying and the substation or feeder bay tie-in needed to complete the changeover.
Have a transmission line to build?
Tell us the voltage class, route length and terrain, and we'll come back with an execution plan and cost.