oh, dont forget the keybinding that lets you deactivate the most inefficient and then activate the most efficient power plants. I have it so that i hit the tild key (the key to the left of the one) to deactivate the most inefficient power plant and left-alt+tild to activate the most efficient deactivated plant, its VERY handy cause i dont have to hop around to all my planets to manage the power plants directly!! (last page of in game keys).