"High load gives low voltage. The street lighting scheme is designed to give sufficient light when the voltage is low. This is typically in the early evening when people arrive home, cook meals, and so on. For the rest of the night and early morning the voltage is usually highest. The lights are brightest, and use more energy, when few people are around and lower lighting levels would be acceptable," he said.

Hadrian said the energy reductions would qualify for Greenhouse Gas Reduction certificates in New South Wales and Queensland.

"However, to qualify it is necessary to have a means to measure the energy reduction and to communicate that data back to a management system. BPL facilitates that data collection and validates the energy savings."