how much is unknown ... on purpose? how much of POET might already be in use (e.g for Stellar Wind) at Bluffdale UDC facilities, or the MRF (Building 5300) in Oak Ridge?
you're not told because you're a civilian.
https://www.wired.com/threatlevel/2012/03/ff_nsadatacenter/all/
worth the read in its entirety.
GLTA,
R.
...
excerpt from
www.wired.com/threatlevel/2012/03/ff_nsadatacenter/all/
The plan was launched in 2004 as a modern-day Manhattan Project. Dubbed the High Productivity Computing Systems program, its goal was to advance computer speed a thousandfold, creating a machine that could execute a quadrillion (1015) operations a second, known as a petaflop—the computer equivalent of breaking the land speed record. And as with the Manhattan Project, the venue chosen for the supercomputing program was the town of Oak Ridge in eastern Tennessee, a rural area where sharp ridges give way to low, scattered hills, and the southwestward-flowing Clinch River bends sharply to the southeast. About 25 miles from Knoxville, it is the “secret city” where uranium- 235 was extracted for the first atomic bomb. A sign near the exit read: what you see here, what you do here, what you hear here, when you leave here, let it stay here. Today, not far from where that sign stood, Oak Ridge is home to the Department of Energy’s Oak Ridge National Laboratory, and it’s engaged in a new secret war. But this time, instead of a bomb of almost unimaginable power, the weapon is a computer of almost unimaginable speed.