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 panel maker First Solar (Nasdaq: FSLR) fell 16% today after Bloomberg reported that the company was stopping deliveries to its Agua Caliente project.

So what: The 397 MW project in Arizona is well ahead of schedule and construction will stop to meet contractual milestones, according to Bloomberg. The alarm by the market is due to the fact that First Solar has moved up shipments, recognizing revenue on the project maybe artificially early.

Now what: First Solar now relies on these big projects for demand and the worry is that it doesn't have enough demand elsewhere in the world to sell the product it will make this year. Construction at Agua Caliente will go forward in January as planned, but it leaves some question marks in the meantime. I think the 16% drop is a bit overdone, but the concerns by investors are very valid, so I wouldn't push all-in on First Solar today. The stock has been on a nice run lately, and if third-quarter results aren't affected by this move, I wouldn't be too alarmed by it.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.