EPC · T09 · Grid & electrical
Transmission Lines — High Voltage & Extra High Voltage Infrastructure
Connecting generation to demand through reliable, scalable transmission infrastructure.
BARREL supports transmission-line engineering and execution packages for renewable power evacuation, conventional generation, interregional transmission, industrial infrastructure and utility networks.
Actual voltage classes and statutory requirements are defined by the applicable grid and utility jurisdiction.
- Segments
- 10
- Work packages
- 5
- Scope items
- 48
01 · Classification
Voltage and infrastructure segments
- 01
11 kV and 33 kV
Distribution-related interfaces.
- 02
66 kV and 110 kV systems
- 03
132 kV and 220 kV transmission
- 04
400 kV Extra High Voltage
- 05
765 kV Ultra High Voltage
- 06
HVDC transmission infrastructure
- 07
Overhead transmission lines
- 08
Underground HV cables
- 09
Renewable evacuation corridors
- 10
Augmentation and reconductoring
02 · Value chain
Detailed value chain
Every package is defined in the proposal with its interfaces, specifications, milestones and acceptance criteria.
- 01
Route planning and surveys
8 scope items- Route alignment assessment
- Topographical surveys
- GIS and corridor mapping
- Right-of-way assessment
- Land and access coordination
- Forest and environmental constraint mapping
- Crossings and clearance assessment
- Tower spotting and route optimisation
- 02
Engineering
11 scope items- Transmission-line design basis
- Tower configuration and selection
- Conductor selection
- Earthwire and OPGW selection
- Sag-tension calculations
- Electrical clearance assessment
- Insulation coordination
- Lightning performance assessment
- Structural and foundation design coordination
- Geotechnical inputs
- Electromagnetic and corona considerations
- 03
Procurement
8 scope items- Tower steel and fabrication
- Conductors and accessories
- Insulators and hardware
- Earthwire and OPGW
- Foundation and reinforcement materials
- Stringing equipment
- Testing and inspection
- Logistics and delivery management
- 04
Civil and construction
12 scope items- Survey and tower pegging
- Foundation excavation
- Reinforcement and concreting
- Stub setting
- Tower erection
- Tower alignment and inspection
- Conductor stringing
- Earthwire and OPGW installation
- Sagging and clipping
- Jumper connections
- Earthing and counterpoise
- Restoration and ROW management
- 05
Testing and commissioning
9 scope items- Tower inspection
- Conductor and hardware inspection
- Earthing verification
- OPGW and fibre testing
- Clearance verification
- Protection and communication interface testing
- Line charging readiness
- Energisation coordination
- As-built drawings and handover
03 · Further scope
Additional capabilities
- Reconductoring
- Line uprating
- Tower strengthening
- OPGW installation
- Transmission-line maintenance
- ROW monitoring and vegetation management
- Emergency restoration works
- Transmission asset rehabilitation
One delivery framework
Specialist scope. Common discipline.
Every technology page keeps its own engineering identity; every project runs on the same controls, quality, HSE and handover framework.
Project enquiry
Connect your power infrastructure.
Share the technology, location, capacity and stage of your project. BARREL's engineering team replies with the scope it can take on, the specialist partners it would bring in and the next step towards a technical proposal.
Performance guarantees, output guarantees and turnkey responsibilities are contract-specific and are set out in each proposal.
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