Yes. They cost more than some cables. But we aren't talking about wiring a stereo.

A new nuclear unit (4 billion-ish) costs about as much as 2,000 miles of transmission-grade cable (about 2 million per mile). Considering that there's about 30 cables on a tower run, you're looking at around 65 miles' worth of cable for the cost of a nuclear unit.

And that's just the cost of the wire. No towers, no conduit, no substations, no land acquisition (aerial easement and underground are very different things), no labor.