Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of solar installer SolarCity (NASDAQ:SCTY.DL) fell 14% today after reporting earnings.

So what: During the fourth quarter, revenue grew 22%, to $25.2 million, but fell well short of the $38.3 million analysts expected. The company also reported a loss of $1.10 per share, which far exceeded the $0.43 loss that Wall Street expected.  

Now what: The big question for SolarCity is; When will it make a profit? This quarter didn't ease any fears investors had and, with shares trading at double the IPO price, expectations have gone up in recent months. I'd take a "wait and see" approach with SolarCity, because there's no indication it can control operating costs and grow sales enough to generate a profit for shareholders.

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