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Notice of Sample Reselection for the Weekly Natural Gas Storage Report

Released: August 16, 2018

The U.S. Energy Information Administration (EIA) will begin publishing estimates of working natural gas stocks and the net change in working natural gas stocks based on a new sample selection in the Weekly Natural Gas Storage Report (WNGSR) on September 13, 2018, with the report for the week ending September 7, 2018. On Monday, September 10, 2018, EIA will revise eight weeks of previously released estimates to gradually introduce estimates from the new sample.

EIA is not changing the established sampling or estimation methodologies for computing the weekly estimates of working natural gas stocks or for computing the net change in working natural gas stocks. EIA applied the existing sample methodology to select the new sample. The new sample is similar to the current sample in terms of number of operators (85 operators in the new sample compared with 79 operators in the current sample) and coverage (more than 90% of storage capacity for each region and the Lower 48 states).

The current WNGSR revision policy and other policies and methods used to estimate working natural gas levels and net change in working natural gas stocks will remain unchanged. The WNGSR publication procedures and schedule also will remain unchanged. Implementation of the new sample will not affect WNGSR products published on EIA’s website, including the wngsr.txt, wngsr.csv, and wngsr.json. No new weekly data files or tables will be produced. Therefore, EIA will not have a period of public testing.

EIA is announcing the upcoming new sample implementation in WNGSR to increase the transparency about EIA’s storage survey, estimates, and methods. Sample reselections are a normal process for sample surveys such as the EIA-912, which is the basis for the WNGSR.

EIA has provided a report comparing the new WNGSR sample with the current sample. In addition, EIA has also provided answers to frequently asked questions about the sample reselection process and implementation.

Schedule for implementing WNGSR sample reselection

Thursday, August 16, 2018
EIA will announce the upcoming sample reselection and provide a report on the new sample and a schedule for its implementation in WNGSR. EIA also will publish FAQs about the new WNGSR sample and implementation.

Monday, September 10, 2018
On Monday September 10, 2018, at 3:00 p.m. Eastern Time, EIA will update the WNGSR report that was released on the previous Thursday, September 6. The updated, September 6, 2018, report will be based on weighted averages of estimates produced from combining the current sample and the new sample for the eight weekly WNGSR reports ending on September 6, 2018. The eight weeks will cover WNGSR reports for the weeks ending July 13, 20, 27 and August 3, 10, 17, 24, 31. The revised WNGSR estimates for the week ending August 31 will be based on only the new sample. The blended estimates for this transition period will be included in WNGSR historical data files on September 10. The revisions to the eight weekly estimates will follow the WNGSR revision policy and will be noted accordingly.

Thursday, September 13, 2018
Beginning with the WNGSR report published on September 13, 2018, containing data for the week ending September 7, 2018, published estimates will be based only on reports from operators in the new sample.

Contact Jose Villar at jose.villar@eia.gov or (202) 586-9613 for additional information.