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U.S. ENERGY INFORMATION ADMINISTRATION NOTE TO EDITORS: EIA Announces Upcoming Changes to Weekly Natural Gas Storage Report
The Energy Information Administration (EIA) will revise the estimation system used to produce the Weekly Natural Gas Storage Report (WNGSR). The effective date for the new system is October 30, 2003, when working gas estimates as of October 24 will be released. On October 30, 2003, EIA also will release storage estimates based on the new methodology for all weeks from July 4, 2003 to October 17, 2003. The new system expands the sample size, updates the reference period for the estimation parameters to the end of June 2003, and changes the methodology used to estimate the total volume of working gas in storage in each of three regions based on the data in the weekly survey sample. The weekly storage estimates are based on a survey sample, and it does not include all companies that operate underground storage facilities. The increased sample size will raise the share of total storage volume that is included in the weekly sample. The methodology changes are designed to estimate more accurately the volumes that remain nonsampled. A complete description of the new methodology will be released on October 29, 2003. A summary discussion of the changes is available at: http://tonto.eia.doe.gov/oog/info/ngs/methchange.html. Related to the changes in the methodology, EIA will discontinue the weekly dissemination of the estimated proportion of total storage volume covered by the survey, which will not change on a weekly basis, and the calculated standard error. A new statement has been added to the report to address survey accuracy. A sample of the revised table format (containing the estimates released on October 16, 2003, with estimates as of October 10, 2003) is available for review at: Customers who receive the data with automated robot readers should test the new format. The revised format will be implemented starting with the first report using the new estimation system on October 30, 2003.
EIA Press Contact: National Energy Information Center, (202) 586-8800 EIA-2003-14 File Last Modified: October 23, 2003
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