UPDATE 1-Tesla's German plant to produce 500,000 cars a year -Bild

(Adds Tesla no comment)

FRANKFURT, Dec 11 (Reuters) - Tesla plans to build 500,000 electric vehicles a year at its new factory on the outskirts of Berlin, Germany's Bild newspaper reported on Wednesday.

Last month, Tesla Chief Executive Elon Musk announced that a site in Gruenheide, Brandenburg, had been chosen to build Tesla Model 3 and Model Y vehicles.

German newspaper Frankfurter Allgemeine Zeitung reported that Tesla will invest up to 4 billion euros ($4.41 billion) in the plant.

Tesla's Gigafactory will create 10,000 jobs, Bild said, citing planning documents to develop the site which is as large as 420 soccer pitches.

Construction will start in 2020, the newspaper reported. Tesla declined to comment on the Bild article or on its expansion plans. ($1 = 0.9073 euros) (Reporting by Edward Taylor; editing by Jason Neely and Louise Heavens)