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 project builder SunEdison Inc. (NASDAQOTH:SUNEQ) jumped 12% today after being upgraded by an analyst.

So what: Morgan Stanley's Timothy Radcliff was the analyst who helped push the stock higher, upgrading the stock to "overweight" and putting a $24 price target on shares. He said the commercial-scale solar market may be as big as 129 GW by 2018 and investors will be rushing to build projects in 2016 when tax credits run out.  

Now what: SunEdison is one of the first project builders to begin keeping projects on the balance sheet to push down to a yieldco, which could unlock value this year. I think that makes the stock an interesting play, but let's not forget that it's not yet profitable the way other project builders are. It will have to prove the ability to build projects profitably to keep on the run it's been on, and I just think there are better solar plays out there.