I always look forward to Earth Hour every year, as an opportunity to burn as much electricity and fossil fuels as possible. Use extra toilet paper on every wipe, leave my car idling in the driveway, crank Eve of Destruction by Barry McGuire on the stereo, flush the toilet as much as possible even when not necessary, and so on and so forth. If other people are going to be slacking off, the rest of us need to pick up our work boots and make up the difference. Have you been putting off a home improvement project that requires the frequent use of several different power tools? Try Earth Hour! What appliances do you have that consume the most electricity? Wait until Earth Hour to cook dinner, and cook something in the oven that takes a long time to cook. There are lots of ideas out there, harness your imagination!
If there are people out there that are going to do this whole blackout routine, then the rest of us need to pull up the slack. We need to make up the difference, such that when the eggheads review the results from the power grid, there is no measurable impact. Otherwise, they are going to use this as evidence for pushing policy, and the last thing we want is Elizabeth May running around telling us to live in the dark all day every day. People, turn on the lights. There is a reason for opposition beyond symbolism. We don't want to give them provable quantifiable results, to back up whatever misguided hypothesis they had in the first place!