As has been previously discussed on this blog, the renewable energy source that shows the greatest promise for generating the power needed to support economic growth is ultradeep geothermal.
This JPT article nicely describes the opportunities and challenges
Good comparison of drilling into hard basement rock with conventional and millimeter wave (microwave) technologies:
Quaise Energy’s first full-scale testing of a hybrid drilling rig combining conventional rotary drilling and millimeter wave drilling capabilities is scheduled for 2024.
Bud's Offshore Energy (BOE) 