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 EnerNOC (NASDAQ:ENOC) jumped 23% today after the EPA announced a new emissions ruling.

So what: The EPA released a rule that said that diesel generators can run without special environmental safeguards for 100 hours per year, far more than the 15 hours the EPA was discussing. CEO Tim Healy will discuss the new rule and its impact on EnerNOC tomorrow at a conference in New York City.

Now what: This shouldn't have much of an impact on EnerNOC's business long-term, and I think the move is greatly exaggerated today. EnerNOC is in the business of matching up energy demand with limited supply, compensating users for turning down demand at peak times. This ruling won't have a big impact on the business, and I don't think the pop will last long.

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