* IPO timing capitalizes on environmental enthusiasm
* Filing is near but exact date not clear
SAN FRANCISCO, Nov 20 (Reuters) - Silicon Valley electric sports car maker Tesla Motors is planning to go public soon, two people familiar with the situation said, outlining plans to sell stock and cash in on investor appetite for green technology and interest in battery-powered vehicles.
The six-year-old start-up's investors include Google Inc (GOOG.O) founders Sergey Brin and Larry Page.
An IPO filing from Tesla, best known for its $109,000 all-electric Roadster, is expected any day, said one of the sources. The person did not give a specific time frame.
Tesla spokesman Ricardo Reyes declined to comment on what he called "rumor or speculation." (Reporting by Poornima Gupta; Editing by Peter Henderson and Derek Caney)