From the (linked) Irish newspaper: Energy companies have shut nearly all offshore Gulf oil and gas production, and were halting production at Louisiana refineries yesterday.

More than 96% of the area's oil output and 82% of gas was offline from late yesterday. At least nine refineries with a combined capacity of 2.2m barrels per day, or 12.5% of US refining capacity, were shut down on the south Louisiana coast.

Here is a picture of what that ("2.2m bbl/day") looks like.

And before and after, in general stay tuned HERE. Or watch your local gas station price billboard for updates.