Clean Energy Fuels ( CLNE), together with its wholly owned subsidiaries, is engaged in the business of selling natural gas fueling solutions to its customers, primarily in the U.S. and Canada. This stock is trading up 5.9% at $17.25 in recent trading. Today's Volume: 1.2 million Average Volume: 1.1 million Volume % Change: 90% From a technical standpoint, CLNE has taken out one major breakout level today since the stock is moving above some past overhead resistance at $17.21 on heavy volume. Traders should now watch for a second breakout level to get taken out at $17.85. A sustained high-volume move and close above $17.85 will setup CLNE to trend higher. Look for volume that's near or well above 1.1 million shares. If we get that action soon, then look for CLNE to re-test $19.36 in the near future. To see more stocks rising on unusual volume, check out the Stocks Rising On Unusual Volume portfolio on Stockpickr. -- Written by Roberto Pedone in Winderemere, Fla.