There are so many energy projects that need probably orders of magnitude less investment than even the geothermal You propose, e.g. like the sodium fuel cell I have been writing about from time to time.

For instance sodium can be used in its metal form directly to produce electricity in a fuel cell e.g. as described in US3730776A (https://patents.google.com/patent/US3730776A/en). The fuel cell does not require any special materials, however it still is a challenge to construct from the engineering point of view. Also, the proposed design can be greatly improved with additional knowledge about the reactions occurring. The resulting sodium hydroxide solution can be recycled using the well known Castner process, the "waste" hydrogen resulting from both reactions can be used as fuel or for other industrial processes.

Btw. the energy density of sodium metal is 3694 Wh/kg and 3555 Wh/litre - so an order of magnitude more than a typical Li-Ion battery. Also, the advantage of decoupling capacity from power is dramatic. Of course, you can also split the process of storing and releasing of energy which can be an advantage. Last but not least, sodium in its metal form is not hard to store or to transport. At ~100°C it becomes liquid and therefore even easier to transfer using regular steel pipes.