API v EIA30 May 2024 20:57
You are so welcome meoryou.
Below is an elloboration of my post and some meat on the bines. For clarity, figures quoted are not recent.
Why do API and EIA data sometimes differ so much from each other?
Thr. U.S. crude oil inventory data released by the API was + 5.32 million barrels, while the OVERNIGHT EIA data was + 1.64 million barrels, a difference of 3.68 million barrels. Both THE API and EIA measure U.S. oil inventories, and both are very authoritative agencies, but why are the API and EIA data sometimes so different?
Chu Liang, a senior crude oil analyst at futures brokerage Schwab Intime, said the main reasons are the following:
First, the statistical sample is different. EIA is the commercial crude oil inventory of all U.S. companies, while API is the crude oil inventory data of all API members and some non-members. EIA's statistical scope is larger than API's.
Second, API is a private organization, and the extraction of statistical data is submitted (or not submitted) by member initiative resources. According to the U.S. Department of Energy, all companies holding 1,000 barrels of crude oil are required to submit inventory changes. Failure to do so will result in a penalty of nearly $3,000 per day.
Third, the import and export data of the US are lagging behind, which may or may not be included in the inventory. If there is a large import and export flow in the current period, it may cause a large deviation.
From the above three reasons, we can find that there may be deviations in the short term (weekly), but in the long term (a month), the data between the two may be very close, and there may be no difference between the two in the long term (a quarter).
However, the API official explanation for the above differences is not due to the above reasons, but because the weekly inventory survey data can only be accurate to 90% (EIA is the same), the other 10% need to be estimated, the reason for the difference is EIA and API estimates.
Just for information. Nothing to add.
Mark