This guide discusses the significance of federal oil spillage regulations and their applicability to substations; identifies the problem of oil spills, which is latent in all substation facilities; discusses the economic aspects of oil spill control; quantifies the extent of the problem with respect to probability of occurrence and degree of risk; discusses methods of dealing with the problem; and provides guidelines for managing the problem. It is not the intent of this guide in any respect to interpret federal regulations. Such interpretation is left to each individual company. The guide is intended in simple, abbreviated form to identify the problem, offer solutions, and let each company make its own evaluation and decisions.