The deeper you dig, the heavier your cable is, and the more energy you waste on accelerating that cable.
And the much bigger issue is, you have to constantly pump out water that will inevitably fill the hole. And that only costs you money.
And the much bigger issue is, you have to constantly pump out water that will inevitably fill the hole. And that only costs you money.
1) Pumps that can pump water 150 meters or a kilometer high are very expensive and require constant expensive maintenance.
2) Where will you pump the water to? Now you have to build huge storage tanks.
3) The water never stops flowing in. Sooner or later you will run out of storage space and your expensive hole will fill up with water.
There is no way, short of fusion that I know of. And fusion is not a valid answer in this context anyway (even if we had the tech for it).