> I work for a utility scale storage company
Clearly not in any sort of engineering capacity given you wildly misused the second law of thermodynamics, which has nothing to do with potential energy, but the flow of heat from hot areas to cooler areas.
Second: energy density has nothing to do with how stable that energy is. 12lb of plutonium could level a city, but not if it isn't in an extremely precisely engineered device.
Third:potential energy and volume, you say?
Do you own a riding lawnmower in your garage? Those have about 2 or more gallons of gas, which is about 66 kWhr of energy.
Pour that out onto your garage floor, strike a match, and let me know how "sad" you are when your garage is leveled, your house structurally damaged, and you're dead in your neighbor's yard.
Do you have a gas grill, and do you keep a spare tank in the garage? 20lb of propane is equal to almost 130kWhr of energy.
Do you keep a 5 gallon jug of spare gas in your garage? 165 kWhr.
So. You were saying?