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 FuelCell Energy Inc. (NASDAQ:FCEL) dropped 20% today after the company released disappointing earnings.

So what: Fiscal fourth quarter revenue was up 55.8% to $55.2 million, which was above the $44.8 million estimate from Wall Street. But investors are more concerned about a $0.05 per share loss, which was two cents worse than estimates and puts expected earnings improvement next year in question. 

Now what: The loss may have been disappointing, but there was a lot of progress in the quarter. Backlog increased to $355.4 million from $318.9 million a year ago and there was the 56% jump in revenue. I think the reaction is harsh given the quarter's progress and wouldn't be worried about missing the earning guess of just two analysts. In short, I see this as a buying opportunity today.

Fool contributor Travis Hoium has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.