The Works Manager at Dofasco was faced with rapidly increasing market prices for fuel oil and natural gas. Anticipating that similar price increases were likely to continue for the foreseeable future, he wanted to be certain that the steel works was making the best use of its energy dollars and, in particular, that the fuels produced as by-products from plant operations were being efficiently utilized. (A Microsoft Excel model is available for use with this case, product 7A98E025.)