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 Clean Energy Fuels (Nasdaq: CLNE) -- the corporation, not the concept -- roared to morning gains as high as 17.1% today amid muscular trading volume.

So what: The producer of vehicle-grade natural gas fuels is on the rise because gas explorer Chesapeake Energy (NYSE: CHK) just promised to buy $150 million of Clean Energy bonds over the next three years. The announcement was followed by an upgrade from Northland Securities.

Now what: Proceeds from the bond sales will let Clean Energy build about 150 refueling stations at strategically chosen truck stops across America, moving natural-gas vehicles closer to the mainstream. This builds on a recent deal to provide natural-gas fuels at 48 UPS (NYSE: UPS) depots as well as a manufacturing deal between Westport Innovations (Nasdaq: WPRT) and General Motors (NYSE: GM) that will put more compatible trucks on the road. Clean Energy might be onto something big here when you put all these moves together.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. The Motley Fool owns shares of UPS. Motley Fool newsletter services have recommended buying shares of Chesapeake Energy, General Motors, and Westport Innovations. 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 is investors writing for investors.