https://poweroutage.us/area/state/texas http://www.ercot.com/content/wcm/landing_pages/89373/ERCOT-I... https://poweroutage.us/area/state/oklahoma
Per your comment about long distance transmission, that doesn't matter in a situation like this. If you're on a large grid you don't necessarily need to transmit power to Oklahoma all of the way from the PNW.
You need the areas surrounding OK to supply excess power to them, then those surrounding areas can get whatever excess they may need from slightly further areas. This needs less and less excess as you go further since every area is over provisioned.
Eventually at some point, yes, the PNW may be supplying excess power to states around them as a result of Oklahoma having outages, but that power isn't going straight from PNW to OK.