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.

Key Capabilities

Design, supply, install and commission of LV and HV power systems, cabling and switchboards

Project Location

Coomera, Queensland

Client Name

Stowe Australia

Project Duration

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