Tesla Motors is preparing to move forward with an IPO, according to unidentified sources at Reuters.

There is no S-1 on file right now, according to the SEC's website, but that would be the first step.

Many have waited for Tesla to start moving on an IPO. It is one of the most visible green companies and, with its loan from the government, will likely be able to fulfill its ambitions of bringing out a sedan in a few years.

The A123 Systems IPO likely had an effect as well. A123's stock zoomed up the first day of trading and sparked hopes that more would follow. (A number of people, in fact, sent Musk news articles on the A123 IPO the day it occurred, I'm told.)

Of course, not everything goes as planned. Although A123 nearly hit $20 on the first day of trading, it is now wallowing around $15. The company went out at $13.50.