Westfield HV Internal Works

About the project

Pensar was engaged by Stowe Australia to complete the HV internal works to power the new Westfield Coomera Shopping Centre.


Coomera, Queensland

Client & Duration

Stowe Australia
October 2017 - October 2018

Project Scope

  • 11kV protection grading study
  • Design and construction of 11kV site network earthing
  • Supply and installation of 11kV circuits
  • Install main switchboard with ARC suppression system
  • Install 7.6km of Energex feeder cable and 3.5km Energex fibre
  • Connect, test and commission 6 kiosk transformers
  • Connect, test and commission RMU’s and dry type transformers for 2 major indoor substations
  • Perform 11kV switching operations
  • Test and commission intake substation
  • Conduct terminations in Coomera zone substation


  • After being engaged late, gaps were identified in the design
  • Pensar completed a detailed design of protectors and earthing
  • Sentre Group had contractual obligations with major retailers, so key delivery dates could not be missed
  • The main switchboard included long-lead time items
  • Cables had to be routed through 7km of existing conduits running across the M1 and past schools
  • Works completed around high-pressure gas, live electrics and traffic
  • A month of commissioning was required before going live
  • Had to install 17 HV joints around live services


  • Commissioning was successfully completed the first time and on time
  • Extensive hours were worked to ensure that a high-quality system was delivered with no defects, ensuring the customer was very satisfied
  • Despite the challenging circumstances, no safety issues occurred
  • Good communication with stakeholders resulted in no complaints from residents or schools
  • Through proactively offering solutions, the scope changes were managed and the project was delivered within the required deadlines

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