I think there are far better choices here on earth and far less costly.
Methane Hydrates for one example. Coal Gasification for another.
Let us run through the choices with several less digits first.
Possibly we have ample energy here on Earth for a few thousand years yet, though the people of Earth will never be told this probable fact; but is something impossible today that is not impossible tomorrow is the question I always ask myself when I look up according to which position am located on within the sphere of this planet at whichever end is up.