Natural and supplemental gas production, supply, consumption, disposition, storage, imports, exports, and prices in the United States.

Updated Note About 2009 Natural Gas Production

As we noted in our prior “Note About 2009 Natural Gas Production,” the combined effects of
elements of our published methodology (See published methodology) mean that production
estimates for some States were not comparable for December 2008 and January 2009.
In particular, the annual movement of companies in and out of the sample of natural gas well
operators and the change in calibration period used for estimation combined to show a decrease
in production in Texas from December 2008 to January 2009, while data from the companies sampled
in both years indicated a small increase - an increase confirmed in later data based on reports to
State agencies. We are conducting a comprehensive review of ways to improve our natural gas
production estimates which is covering not only sampling and estimation, but also other issues
such as sudden changes in production from previously non-sampled operators and comparisons
with other data sources. We plan to publish a single set of revisions to our estimates for 2008 and
2009 when the review is complete later in 2009, along with documentation of any methodological changes. For the interim, we have posted a more detailed discussion of these issues in
detailed discussion.

Technical Contact: Gary Long (214) 720-6182

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