The energy wheel is a simple tool used to help improve hazard recognition and to assist the identification of ‘Stuff That Can Kill You’ (S.T.C.K.Y). 
If you can see more hazards, then you can avoid or work safely around them. Remember a hazard is something that has the potential to hurt you. The energy wheel runs through ten different categories of energy and describes potential ‘high’ energy hazards, direct controls, and supporting controls associated with each hazard.