Natural resources used for today's energy storage a fast disappearing.  This coupled with the high cost of energy storage leads to leads to enduringly challenging headwinds.

Technologies to overcome these strategic inflection points are rapidly developing and this is a great article, from the WEF, on several of these new approaches to energy storage:

1. Safer batteries: Scientists are developing solid electrolytes, which would make batteries more robust. 
2. Battery alternatives for storage: Using sand instead of salt to store concentrated solar energy
3. Advanced renewable fuels: Using hydrogen as a renewable energy source.