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POWERING UP PERTH: THE WESTERN POWER HAY TO MILLIGAN PROJECT
A major electricity infrastructure milestone was recently achieved in Perth, with work complete on the long-planned Western Power Hay to Milligan Project – a critical piece of state electricity infrastructure that secures power supply in the CBD, helping to deliver a bright future for the city and the state.
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estern Power is a State Government-owned corporation responsible for building, maintaining and operating an electricity network that connects 2.3 million customers in the southwest corner of Western Australia. Part of the $37 million Western Power project was the installation of a 132kV underground cable circuit between the existing Hay Street Substation (HAY) and Milligan Street substation (MIL) in the Perth CBD – to meet N-2 CBD reliability requirements. A ROI was released to the market in late 2016 followed by a tender process in 2017. Following in-depth negotiations, Daly’s Constructions was awarded the project in August 2018. The contract was awarded on an EPC basis, with Daly’s responsible for: • Final route verification and selection • Approvals from all stakeholders • Cable system detail design to achieve a 175MVA summer rating • Procurement of all materials including 132kV power cable, cable joints, accessories and all civil construction materials • Cable hauling • Cable jointing and terminating
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UTILITY • NOVEMBER 2021
• Construction and installation • Pre-commissioning tests & handover Daly’s partnered with Taihan Electric Australia to deliver the project.
CHALLENGES Daly’s Constructions’ first project in Western Australia required detailed planning, especially involving mobilisation of resources, plant and equipment, as well as establishing suitable subcontractor and supplier arrangements. In addition to working with Western Power, complex engagement, negotiations and approvals in the design phase were required from major stakeholders, including: • Public Transport Authority • Metropolitan Redevelopment Authority • City of Perth • Water Corporation of WA • Main Roads WA • ATCO Gas One of the key challenges experienced during the project included: confirming a route that would satisfy third party approval requirements and minimise disruption to the CBD, whilst achieving the required circuit rating where the circuit is to be installed in close proximity to existing 132kV feeders. WWW.UTILITYMAGAZINE.COM.AU
