Rooftop solar panel installer SolarCity announced that it confidentially submitted a draft registration statement with the SEC last Thursday and plans to conduct a registered IPO. The startup has raised over $243 million in venture financing, most recently snagging a $66 million round led by Silver Lake Kraftwerk and Valor Equity Partners. Elon Musk is also an investor and so is SolarCity's board chairman. Solar-centric IPO plans went slightly awry these last couple months, leaving many curious to see how SolarCity will fare. BrightSource canceled IPO plans a few weeks ago, while Enphase Energy sold almost 9 million shares at $6 apiece, but that was after initially setting its expected share price range at between $10 and $12.