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Collins Square Towers

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First year bill saved
First year energy generate

Project Overview

Venergy Solar partnered with Walker Corporation to deliver a cutting-edge rooftop solar energy solution across three high-rise towers in the iconic Collins Square precinct, one of Melbourne’s largest commercial developments. The systems span a combined 223kW capacity, using Trina 450W Tallmax panels, SolarEdge optimised inverters, and locally manufactured components including SUNLOCK racking and SolarTune protection boards.

Delivered in a live, high-density CBD environment, the systems are fully integrated with regenerative lifts, BMS/EMS, and trigeneration units, supporting NABERS 6-star rated buildings. A total of 500 solar panels were installed across Towers 1, 2, and 4, achieving an impressive 99.7% site utilisation and contributing significantly to Walker Corporation’s national sustainability targets.

“Collins Square is a flagship for sustainable development, and our solar investment is a key part of reducing operational impact while maintaining world-class infrastructure for our tenants.”
Representative
Walker Corporation

The Challenge

Installing solar at height across three operational high-rise towers presented unique technical and logistical challenges. Each rooftop had limited usable space and was shared with co-generation systems and other critical infrastructure. Planning had to ensure zero disruption to high-profile tenants such as KPMG, AUSTRAC, and MLC Insurance. Panel-level monitoring, acoustic management, noise scheduling, and generator safety interlocks were essential to satisfy the site’s engineering, safety, and operational constraints.

The Solution

Venergy engineered a custom rooftop layout using high-efficiency 510W Trina Solar panels, allowing full system capacity within a constrained area. A dual inverter system with split-phase configuration was designed to operate within limited DB capacity, while a freestanding bracket was developed to mount one inverter near the connection point where wall space was unavailable. Installation was completed using GEDA SolarLift technology to ensure safe, efficient lifting of materials without interrupting business operations.

The Results

Across the three towers, the systems are delivering a combined annual output of 275.1 MWh, with site utilisation rates of up to 100%. The project contributes to a 40.98% annual energy reduction across Collins Square and enhances the precinct’s 6-star NABERS energy credentials. The installation was delivered with no disruption to tenants and has become a model for high-efficiency commercial solar in Australia’s CBDs. The success of the project demonstrates Venergy’s ability to safely and effectively deliver large-scale rooftop solar in the most challenging urban environments.

First Year Savings

$68,000

Payback Period

4 yrs 6 mths

Trees Planted/ annual

11,642

CO2 saved/ annual

253.09 tonnes

Matthew Wilkins

CEO | Venergy Solar Australia

“Delivering this kind of solar performance on constrained CBD rooftops takes precision, planning, and proven technology, and we’re proud to set the standard for what’s possible in high-rise commercial solar.”