Earthgrid aims to re-wire the USA using super-cheap tunnel tech

https://newatlas.com/energy/earthgrid-tunnel-boring-robot/

"72 plasma torches drill 1-meter... 500 kW... high-power 120 MW... triple diameter attach mother rig behind... 10-m tunnel attach another bigger behind... could get high as 1.38 gigawatts... 1 km per day... low-cost configuration... $300 per meter... less expensive... lower operating costs (no need to change out drill bits & cutter heads multiple times daily... lower energy... robotics... no drilling mud and/or drilling chemicals... easier spoils removal, sale of our spoils for road & concrete manufacturing"

Related: Reconductoring: Easy Way To Expand the Grid

https://heatmap.news/climate/clean-energy-grid-reconductoring