On April 30, Tesla Motors will make what's believed to be a home energy and utility-scale battery storage announcement.

That announcement, called "The Missing Piece" by Tesla, will take place at the Tesla Design Center in Hawthorne, California at 8pm Pacific Time.

With the electric car from Tesla and solar from SolarCity, the missing piece is energy storage.

Tesla Home Battery

Tesla Home Battery

Tesla sent out last-minute invites (emails sent yesterday) for the event to current Model S/Roadster owners. The event is now booked to capacity.

We'll cover the announcement as it occurs on Thursday night.