Might look good financially to the installer, but rarely will it be a cost savings to the customer. It's still just obscenely expensive and I can't see it ever being more than a niche application in the long term, what with nuclear ultimately so cheap and effective. So much fun, though, I love playing around with wind, solar, tidal, and the energy storage stuff, too. I tell ya, nothing beats a superconducting electromagnetic "battery" floating in a giant cryogenic vat of liquid helium to bring out the nerd in all of us! Ah, too bad it's not practical for everyday use.