?! And where did I claim such a thing? I corrected you when you claimed that there is a method of directly storing AC, there isn't. When you claimed storing is practical, it isn't as you have loose energy to convert it to storable form and then again lose to convert it again. And large amounts is your claim! Not mine, I was answering to your claim:
"There are many practical ways of storing large amounts of energy"
Sounds familiar? Which is also incorrect. Or let's say depends on your definition of large. You seem to think 6000MWh is large amount, I know it can sustain for example LA for a better half of an hour i. e. laughable amount.
Did you read up about the difference between DC and AC. Or do you still think what's in flashlight battery is the same thing that comes out of an electrical outlet?