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U.S. ENERGY INFORMATION ADMINISTRATION EIA Announces Upcoming Changes to the Weekly Natural Gas Storage Report The Energy Information Administration (EIA) will revise the estimation system used to produce the stock estimates published in the Weekly Natural Gas Storage Report (WNGSR). The effective date for the new system is August 4, 2005, when working gas estimates as of July 29 will be released. At the same time, EIA also will release revised storage estimates based on the new methodology for all weeks from June 17, 2005, to July 22, 2005. EIA Administrator Guy Caruso stated that “While the existing system has worked well, we are confident that the changes to the weekly natural gas storage system will provide even higher quality estimates for data users. These changes reflect EIA’s continuing efforts to monitor and improve performance of our information products." The new system expands the sample of companies used for estimation from 56 to 63 and revises the approach used to estimate the volume of working gas in storage from the weekly sample data. EIA examined a number of options to enhance the current estimation procedure to determine if modifications might improve estimates. The selected method of estimation uses both recent data from the EIA-191, “Monthly and Annual Underground Storage Report,” and the latest data collected on the weekly EIA-912 survey. The new method is based on analysis of data trends on an individual company basis. Company-specific estimates are summed to produce regional and national totals. This is a distinct departure in approach from the current method, which estimates the total volume for non-sample companies as a group based on the aggregate volume of a set of sample companies. A summary discussion of the changes is available at: http://tonto.eia.doe.gov/oog/info/ngs/methchange-2005.html.
EIA Program Contact: William Trapmann, (202) 586-6408 EIA Press Contact: National Energy Information Center, (202) 586-8800 EIA-2005-08
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