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That excludes the cost of transmission and distribution, which is more than half the cost of electricity prices to rate payers.

And using batteries to smooth out the leaks will allow greatly reducing the peak size of equipment for T&D.

Additionally, look at wholesale markets for electricity, such as Texas', and you will see price swings during a day far far in excess of 18 cents/kWh. This indicates that storage is extremely economical today.

It's only used for those periods when demand exceeds supply. In Texas, the wholesale price of electricity is $9/kWh during those periods.

During a brownout energy is worth a lot more, dollars to tens of dollars.

But this article is not talking about brownouts this is talking about routine use.