The Standard Industrial Classification (SIC) system has been replaced by the North American Industry Classification System (NAICS).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 same1998 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 for1998 at the national level only.

(a) Total is the sum of all of the listed energy sources, including Other, minus the shipments of energy sources produced onsite.  It is the total amount of first use of energy  for all (fuel and nonfuel) purposes.

(b) Net Electricity is obtained by summing purchases, transfers in, and generation from noncombustible renewable resources, minus quantities sold and transferred out.  It does not include electricity inputs from onsite cogeneration or generation from combustible fuels because that energy that already has been included as generating fuel (for example, coal).

(c) Distillate Fuel Oil includes Nos. 1, 2, and 4 fuel oils and Nos. 1, 2, and 4 diesel fuels.

(d) Natural Gas includes natural gas obtained from utilities, local distribution companies, and any other supplier(s), such as independent gas producers, gas brokers, marketers, and any marketing subsidiaries of utilities.

(e) Examples of Liquefied Petroleum Gases (LPG) are ethane, ethylene, propane, propylene, normal butane, butylene, ethane-propane mixtures, propane-butane mixtures, and isobutane produced at refineries or natural gas processing plants, including plants that fractionate raw Natural Gas Liquids (NGL).

(f) Other includes net steam (the sum of purchases, generation from renewables, and net transfers), and other energy that respondents indicated was used to produce heat and power or as feedstock/raw material inputs.  

(g) Shipments of Energy Sources Produced Onsite are those shipments produced or transformed onsite from the nonfuel use of other energy sources.  For example, at an establishment that processes coal to make coke for later use, the entire quantity of coal is counted as first use. Any onsite consumption of coke is not counted as first use because it would duplicate the coal use.  If some of the coke is then sold to another establishment, then that second establishment will consider this coke to be a shipment of an offsite-produced energy source. Hence, the second establishment will count this coke as its first use, thereby resulting in double counting.  In order to eliminate the double counting, the energy equivalent of the coke shipment must be subtracted from first use.

(h) For the petroleum refining industry only, the feedstocks and raw material inputs for the production of nonenergy products (i.e., asphalt, waxes, lubricants, and solvents) and feedstock consumption at adjoining petrochemical plants are included in the Other column, regardless of type of energy.  The  remaining columns for the petroleum refining industry include only energy that was consumed for the production of heat and power.  The Other column also includes net steam and other energy that respondents indicated was used in the production of heat and power.  Those inputs and feedstocks that were converted to other energy products (e.g., crude oil converted to residual and distillate fuel oils) are excluded.

        Notes: Totals may not equal sum of components because of independent rounding.   The derived estimates presented in this graph are for the first use (formerly primary consumption) of energy for heat and power and as feedstocks or raw material inputs.  First use is defined as the consumption of the energy that was originally produced offsite or was produced onsite from input materials not classified as energy.  Examples of the latter are hydrogen produced from the electrolysis of brine; the output of captive (onsite) mines or wells; woodchips, bark, and woodwaste from wood purchased as a raw material input; and waste materials, such as wastepaper and packing materials.  First use excludes quantities of energy that are produced from other energy inputs and, therefore, avoids double counting.

Source: Energy Information Administration, Office of Energy Markets and End Use, Energy Consumption Division, Form EIA-846, '1994 and 1998 Manufacturing Energy Consumption Surveys,' and Office of Oil and Gas, Petroleum Supply Division, Form EIA-810, 'Monthly Refinery Report' for 1994 and 1998.