Elon Musk, co-founder and chief executive officer of Tesla Motors Inc., speaks during an interview at the company's assembly plant in Fremont, California, U.S., on Wednesday, July 10, 2013.

Tesla CEO Elon Musk made it official on Tuesday -- the electric car company plans to build a 'Gigafactory,' and engineering and design center in Berlin, Germany.

The facility would be Tesla's fourth, following the first Gigafactory battery plant in Nevada, near Reno; a factory that makes charging equipment and power electronics in Buffalo, New York, with plans to make Tesla Solar Roof tiles there someday; and another car plant that's coming online in Shanghai, today.

Musk said, "Everyone knows that German engineering is outstanding, for sure. That's part of the reason why we are locating our Gigafactory Europe in Germany. We are also going to create an engineering and design center in Berlin, because Berlin has some of the best art in the world." When pressed for more details, Musk said the factory will be located near the new airport in the Berlin area.