The EIA crude oil inventory report explained: what moves oil every Wednesday
What the EIA is, what the Weekly Petroleum Status Report measures, why it comes out Wednesdays at 10:30 a.m., draws vs. builds, Cushing, the API report and how oil reacts.
Every Wednesday morning, crude oil futures can jump or drop a dollar in seconds. The reason is a single government report that answers one question: did the United States add oil to its storage tanks last week, or use more than it brought in?
What EIA stands for
EIA means the U.S. Energy Information Administration, the independent statistics agency inside the U.S. Department of Energy. It collects and publishes official data on oil, gas, electricity and coal. The report traders watch is the Weekly Petroleum Status Report, usually just called the EIA crude inventories or oil inventory report.
When it comes out
| Published by | U.S. Energy Information Administration (EIA) |
| How often | Every week |
| When | Wednesday at 10:30 a.m. New York time |
| After a Monday holiday | Usually delayed a day, to Thursday at 11:00 a.m. |
| Covers | The week that ended the Friday before |
What it measures
Oil is counted in barrels (one barrel is 42 U.S. gallons, about 159 liters). The report includes:
- Commercial crude oil inventories: how much crude is sitting in U.S. storage, not counting the government's emergency stockpile (the Strategic Petroleum Reserve). This is the headline.
- Gasoline inventories: fuel ready for cars. Watched closely in summer driving season.
- Distillate inventories: diesel and heating oil. Watched closely in winter.
- Cushing, Oklahoma stocks: the storage hub where the U.S. oil futures contract (WTI) is delivered, so its level matters directly for futures prices.
- Refinery use, production, imports and exports: they explain why inventories moved.
A draw means inventories fell: demand was stronger than supply, which usually pushes oil up. A build means inventories rose, which usually pushes oil down.
The API report the night before
On Tuesday at 4:30 p.m. New York time, the American Petroleum Institute (API), an oil industry group, sends its own estimate to subscribers. It's private and less complete, but traders use it as a preview. When the EIA number disagrees with the API, the Wednesday move can be bigger.
How to read it
- Against the forecast: analysts expect a certain draw or build. A 3-million-barrel draw when 1 million was expected is a bullish surprise.
- Look past crude: a big crude build with big gasoline and distillate draws can be read very differently than the headline suggests.
- Seasons matter: refineries slow down for maintenance in spring and fall, and driving peaks in summer, so builds and draws follow a yearly pattern.
- Natural gas is separate: the EIA's natural gas storage report comes out Thursdays at 10:30 a.m. and moves natural gas futures (NG).
Every market it moves
This report doesn't only move futures. Here is what usually happens across markets in the first minutes and hours, compared with what economists expected. The ticker symbols in parentheses are the futures contracts traders use for each market.
| Market | Bigger draw than expected (inventories fell) | Bigger build than expected (inventories rose) |
|---|---|---|
| Crude oil: WTI and Brent (CL, MCL, BZ) | Usually rises | Usually falls |
| Gasoline and heating oil (RB, HO) | Usually rise, especially when gasoline stocks fell too | Usually fall |
| Energy stocks: Exxon, Chevron, oil producers (XLE) | Usually rise | Usually fall |
| Airlines and trucking companies | Can fall: fuel is one of their biggest costs | Can rise |
| Oil-linked currencies: Canadian dollar (6C), Norwegian krone | Can firm a little | Can weaken a little |
| Stock indexes (ES, NQ) | Little effect, unless oil makes a big move | Little effect |
| Inflation expectations and bonds | Higher oil feeds into gasoline prices and CPI over the following months | The opposite |
These are the usual first reactions, not rules. When the market fears a slowdown more than inflation, good news can become bad news for stocks, and the other way around. Watch how prices actually react before acting on the number. The dollar, oil and gold and bonds and yields explained go deeper into how these markets connect.
What it means for futures traders
- Crude oil futures (CL, MCL) move the most, often in a fast spike right at 10:30 a.m., with wide spreads for a few seconds.
- Index futures (ES, NQ) usually ignore it, unless oil makes a very large move.
- Micro crude (MCL) is one tenth of the size of CL, so a $1 move is $100 on MCL and $1,000 on CL per contract.
How to handle it
If you trade crude oil, Wednesday at 10:30 a.m. is the one moment each week to be flat or deliberately sized. If you trade the indexes, you can usually ignore it. The dollar, oil and gold explains what drives oil beyond this report. Market Matrix shows the EIA report on the Market events calendar with an alert you can set.
This article is for education only and isn't financial advice. Trading futures involves substantial risk of loss. Release dates and times come from the agencies that publish the data and can change.