Perth Solar City energy efficiency trial reduces home power costs


Perth, Australia — (METERING.COM) — March 27, 2012 – Preliminary results from Western Power’s energy efficiency trial as part of the Perth Solar City program have shown that households can halve their power bills – and even with no cost to the householder, electricity bills can be easily reduced by nearly 10% simply by turning off lights and appliances when not in use.

Perth Solar City, which is managed by Western Power on behalf of the Australian government, has seen more than 30 energy efficiency and renewable energy projects developed and implemented for households within its target area – Perth’s Eastern Region.

The preliminary results show a broad range of positive results, including:

  • In-home displays – there is evidence to suggest that access to real time energy use data can assist in reducing electricity use by residential in-home display users (6.82%), and schools (54%)
  • Demand management (air conditioner trial) – 20% reduction in electricity use at peak time during year one
  • Time-of-use tariff (power shift) – 10.9% reduction in electricity use during the “super peak” period
  • Residential solar PV systems – 57.9% reduction in average daily electricity use (from the grid), or 11.36 kWh per day
  • Residential solar hot water systems – 15% reduction in average daily electricity use
  • Behavior change – 8.5% reduction in average daily electricity use.

“It has become clear that access to real time energy use information, rather than a bill every 60 days, is key to real savings for households or bigger energy users,” commented Western Power’s acting chief executive officer, Paul Italiano. “The real benefit of this comprehensive research is that not only Western Power but the state will be better informed in its future decisions.”

A Western Power statement notes that since the launch of the Au$73.5 million (US$77.4 million) Perth Solar City program in November 2009, it has become the most comprehensive energy efficiency initiative in Western Australia.

Western Power will continue to evaluate the results of the four year program with final results expected in 2013.

A copy of the report can be found at