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They keep announcing stuff like this yet Tesla Energy can't guarantee that I'll get my powerwalls installed by the end of the year. A local company that would like to become certified for the powerwalls can't even get Tesla Energy to return their calls.
That is an inexpensive solution for times when the grid is down, and it aids the utility the rest of the time.
I cannot begin to sort out the other benefits since they will be very utility dependent. If this lets Green Valley continue to offer "free" net metering it is a win-win.
This could be huge in California. Of course, as others have said, they need to get units installed or there will be nothing to aggregate. Green Mountain is a good utility to start and demonstrate it's viability.