An unusual inventory number is more useful when readers know how it was estimated. EIA's March 9, 2017 article reported a net Lower 48 gas-storage injection of 7 billion cubic feet for the week ending February 24. It was the first February weekly injection in the collected series, attributed to unusually warm weather, not a forecast of the next price move. [30272][29712]
The national figure combined South Central additions with withdrawals in other regions. Stored working gas subsequently totaled 2,363 billion cubic feet, about 300 billion above the comparable 2012–2016 average. A reader assessing availability therefore has both a weekly net change and a stock comparison, rather than a single undifferentiated measure of supply. [30272][29712]
EIA's January 27 methods article identified another kind of information: sampling variability. The weekly report uses a sample of storage operators, and its new statistical disclosures began with the January 20 week. The estimation method itself was unchanged. Knowing that distinction prevents a transparency change from being misread as evidence that the underlying physical gas market suddenly changed. [30272][29712]
The incentive-related interpretation is that users evaluating an inventory claim should demand its measurement limits as well as its headline. That is an analytical standard, not a documented change in traders' behavior. The sources do not establish a price response, a profitable strategy or an effect on competition. Nor can a January example's error bounds be borrowed for February. Useful public information can sharpen a question without answering what gas should trade for. [30272][29712]
Source documents
- Warm weather leads to first recorded natural gas storage injection in Februaryhttps://www.eia.gov/todayinenergy/detail.php?id=30272
- EIA’s weekly natural gas storage data now include measures of sampling variabilityhttps://www.eia.gov/todayinenergy/detail.php?id=29712