Tesla is planning to unveil a solar roof product for buildings at an event on October 28th in San Francisco, according to a tweet from Tesla CEO Elon Musk. The solar roof would be the first new product to come out of the SolarCity/Tesla merger, though that transaction has yet to close.

Musk says the solar roof will include a Powerwall battery and a Tesla charger. The solar roof was the first item in Musk’s "Master Plan, Part Deux" for Tesla, released back in July. The goal is to combine batteries built at the Tesla Gigafactory with SolarCity’s panels to create an all-in-one solar product.

Tesla did not immediately return an emailed request for comment.