Real solution would be turning off power stations, but I don't think it would be good idea.
I thought about this when my science teacher was telling us about Earth Hour. I realized that while this would kind of solve a problem, it would be a colossal disaster and a
really stupid thing.
Plus it would kind of miss the point that this thing is trying to get across. It's not to save energy, but more to raise awareness about the fact that we need to do something about climate change.
On top of that, people don't choose to have the power plants turned off, this is kind of about making a personal choice to do something about what's going on in the world in a small way
Not to explicitly state this, but the power plants at least in America and Canada function on a grid, where a single power plant doesn't supply power for a block of houses and businesses, but puts the energy into a larger power grid. Because of this, it would be astronomically inconvenient for everyone in the country, but it would also probably be rather costly as well, both in the very act of turning off all the power plants and not breaking something, and the displaced costs of everything screwed up by losing power.