Just the ONE!!!!
What about all the floating sea going ones and Brazil, xx, xx, xx, xx, and similar operations?
Nah!
This is just to satisfy tin hat people that don't pay attention.
That was old technology... lots of smaller portable ones plus other techniques can replace and have.
Some research will turn up all the other stationary... but I don't know if there is a count of portable ones. Anybody wana look?