The energy you have is based on the computer being used right?
Question 1: If I use my account on another computer, will I have a new energy count based on the computer? or is it registered by account?
Question 2: Im planning on reformatting my PC (its kinda on the edge lately), So will that affect my energy, having a "new" pc to use for the game?
1) the energy works in a lowest common denominator style. Both accounts and computers are tracked. Even if no one has used that computer the knight you bring over will have the energy counting from the old computer. If you have a free account and a free account has been playing on that computer you will have whatever energy was left for that account on that computer.
2)No, reformatting will not make your computer count as a "new" computer.