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Its a bit of both, the energy is quite small but its still there.
Its primarily used for repair and bulking, taking in extra protein promotes protein synthesis, which inturn enables your body to grow faster. This is especially useful if your doing weights or heavy work. While your working out, you rip/strain/tear muscle, an protein will help that repair quicker and make the muscle stronger.
*very short answer, but if you search for protein synthesis on google it will help you get it, or http://www.muscletalk.co.uk/protein.aspx (this is one of my fav sites).