Established in 1853, the University of Melbourne is a public-spirited institution that makes distinctive contributions to society in research, learning and teaching and engagement. It’s consistently ranked among the leading universities in the world, with international rankings of world universities placing it as number 1 in Australia and number 34 in the world (Times Higher Education World University Rankings 2013-2014)


The University of Melbourne were looking for an energy saving system for it’s Law Building and conducted over 100 hours of research and deliberation into voltage optimisation.


Following the completion of a comprehensive site survey, analysing the site, a 1150kVA Powerstar MAX, was installed at the University’s Law Building, the first electronic dynamic type of voltage optimisation unit installed in Australia.

Three months after commissioning the installation, using International Performance Measurement and Verification Protocol (IPMVP), results were proven which showed energy savings of 12.75%, surpassing the guaranteed savings of 10.1% and equivalent to the elimination of 268 tonnes of CO2.      

Please view the video below to see the installation:

Harry Troedel, Sustainability Manager Implementation, Property and Campus Services at The University of Melbourne said, “The energy efficiency of VO systems means that because we are consuming less energy, we are reducing our carbon footprint and COemissions, which is good news for the planet,” he said.

Powerstar was the only voltage optimisation system tested which made savings on LED lights. The University of Melbourne tests were carried out under controlled conditions and were recorded at the University.

Please view the video below to see the demonstration:

The unique and patented Powerstar system has also shown that significant savings, between 6% – 10% can be achieved when modern Variable Speed Drives (VSDs) are connected.

Powerstar returns the excess voltage in terms of real negative power (back EMF) which is subtracted from the grid input power. In simple terms, any excess voltage above the Powerstar set-point, is chopped and returned in the direction of the supply, generating a real negative power (back EMF) which flows towards the supply which is subtracted from the incoming power.

70-80% of the total savings come from the negative power (back EMF) feedback while 20-30% come from the improvement in the equipment efficiencies.

text Download the PDF