The Standard Industrial Classification (SIC) system has been replaced by the North American Industry Classification System (NAICS).  Since the Bureau of the Census has collected the information necessary to classify establishments on both an NAICS and an SIC basis, the same 1998 data can be shown on both the old and the new basis in bridge tables that allow comparisons between the two systems.  These data are hereby produced for the last time on an SIC basis for 1998 at the national level only.

(a)   Cogeneration is the production of electrical energy and another form of useful energy, such as heat or steam, through the sequential use of energy. Cogeneration includes electricity generated from fossil fuels, such as natural gas, fuel oils, and coal; wood; and other biomass.

(b)  Renewable Energy is energy obtained from essentially inexhaustible sources. Noncombustible sources include solar power, wind power, hydropower, and geothermal power.

(c)  Other is that electricity obtained from a generator fueled by combustible energy sources, such as diesel fuels and other fuel oils.

      Source: Energy Information Administration, Office of Energy Markets and End Use, Energy Consumption Division, Form EIA-846, '1994 and 1998 Manufacturing Energy Consumption Surveys.'