On behalf of andysc:

Joe Short - - shows fluctuations in frequency, which shows demand/supply imbalance. Use that to drive behaviour, knowing if there's power surplus or famine - fridge should be making decisions based on supply/demand in the grid

have a daily target for energy use, and turn your orb red when you hit it at whatever time in the day

what motivates people to use less? peer pressure can turn some people off
money in your pocket is good! not knowing how "bad" you are until you compare

near-death experience drives change