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The Northern Illinois Gas Company (Ni-Gas) began the annual ENERCON EXPO in 1974 that gathered “commercial and industrial customers and consultants to demonstrate energy conservation equipment and applications.” Ni-Gas, the founder of the expo, began working toward energy conservation in 1972 and produced conservation handbooks in 1973 to advertise their efforts. In 1975 Ni-Gas began working on a project employing ceiling insulation to enhance heating and cooling efficiency. ENERCON has since become an energy conservation firm partnering with other energy professionals to ensure safe energy development and use.
U.S. Department of Energy. (1978). Allocation of Petroleum Feedstock: Northern Illinois Gas Company Aux Sable SNG Plant. Retrieved from https://books.google.com/books?id=oP8wAQAAMAAJ&printsec=frontcover&sourc...