Factbox: U.S. Gulf Coast energy infrastructure shut due to Harvey

Several refineries and portions of key pipelines had resumed operations as of Tuesday, while terminals, drilling platforms and other facilities were working to restart after the storm knocked out roughly 4.2 million barrels per day (bpd) of refining capacity, or nearly 23 percent of total U.S. capacity.

As of Tuesday, about 3.8 million barrels of daily refining capacity, or about 20 percent, was shut in, though a number of the refineries in that group were in the process of restarting. Several others, including Marathon's Galveston Bay and Citgo's Corpus Christi refineries, were running at reduced rates, according to company reports and Reuters estimates. 

Motiva Enterprises said it could return to 40 percent production at its Port Arthur, Texas, refinery, the nation's largest with capacity of 603,000 barrels a day, by the end of this weekend. Motiva is waiting on the restoration of shipping and pipelines to begin the partial restart, sources said.