$2 Amount Warwick and Lola Neilley are spending each month on electricity. They recently installed a four-kilowatt system on the roof of their home in Melbourne's northern suburbs. Last Modified: 14-Apr-2017 9:01 AM 69 Posted by AUS Sustainability in Energy Tags Renewable Energy Rooftop Solar Melbourne Victoria Australia Source ABC News | AMY BAINBRIDGE | Photo credits: Chris Le Page