We reported previously that the Energy Information Administration (EIA) planned on modifying the methodology it uses to estimate production data. Here is the revision methodology (EIA's new simple ratio method implemented for the first time this month). From EIA's website: "Beginning this month, EIA introduces a new method to estimate monthly natural gas production and uses it to estimate production in February 2010 and to revise previous estimates for 2009 and January 2010. Using the new method, EIA revised January 2010 estimates downward 0.6 Bcf/d for the lower 48 States. Nearly all of this revision came from 3 areas: the Federal Gulf of Mexico (GOM), Louisiana, and Texas. Revisions to 2009 estimates for the lower 48 States were generally negative as well, ranging from -0.3 percent at the beginning of the year to -1.3 percent at year end."
