Here's a few bits, hopefully useful: * 1 kwh is about 25.5 cents going by the average tariff in NSW. (It's ok to approximate). * That means a full power 2400w

Here's a few bits, hopefully useful: * 1 kwh is about 25.5 cents going by the average tariff in NSW. (It's ok to approximate). * That means a full power 2400w heater you use in the evenings from 7pm to 2am, costs around $4.35 for those 7 hours. After 3 months of doing this most evenings it might be a $300+ item on the bill. * Modern TVs and appliances often boast "1 watt standby". You won't notice any dent on your bill from these. Sure, on a global scale you're doing your bit, but it makes bugger all difference on your bill if you leave these on. Except of course if you have pre-2006 appliances, sound systems etc, that can sometimes drain 20 - 40 watts on standby which is bad. * you could invest in a coin-op box for your electric heater. Ebay has them, little metal boxes with timers, mainly used for coin-op PCs in cafes. They can accept different coins and multi values. They remove the stress when you see your house-mate using the heater! 60 cents buys one hour of heater or whatever you set it to. * hot water is cheaper if you have off-peak power (properly done on a dedicated off-peak circuit). If you're renting you might not even know whether you have off-peak hot water. The size of your hot water cylinder needs to be big enough to qualify for off peak. * Lowering thermostat by 10 deg would definitely make a difference on your bill. * Energy efficient lights bulbs means your total lighting cost for 3 months really is a small dot on your bill. The big stuff is hot water, and your big appliances.