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Short interest moves among solar and alternative energy stocks were mixed during the two-week reporting period that ended on July 13.  Of the companies we watch, short interest fell on two of three solar stocks and on all four alternative energy stocks.

First Solar Inc. (NASDAQ: FSLR) saw short interest fall by 11.6% to 6.32 million shares, which represents about 8.4% of the company’s float. Days to cover rose from three to four. In the two-week short interest period, the stock’s share price rose by 2.9%. The stock’s 52-week trading range is $44.19 to $81.72, and it closed at $53.05 on Tuesday, up about 0.8% for the day.

SunPower Corp. (NASDAQ: SPWR) short interest decreased by 6.7% to 15.92 million shares, or 26.2% of the company’s float. In the two weeks to July 13, the share price rose by 2.3%. The stock’s 52-week range is $6.46 to $11.70, and it closed at $7.30 on Tuesday, down about 0.5% for the day. Days to cover rose from 11 to 15.

Canadian Solar Inc. (NASDAQ: CSIQ) saw an increase of 10.9% in short interest during the first two weeks of July. Some 8% of the total float, or 3.58 million shares, were short, and days to cover rose from three to seven. The company’s share price rose by 7.5% over the period, and shares closed Tuesday at $13.04, up about 3.8% for the day, in a 52-week range of $11.37 to $19.09.

FuelCell Energy Inc. (NASDAQ: FCEL) posted a dip of 0.6% in short interest during the two-week period. Some 10.61 million shares were short as of July 13. The stock closed at $1.35 on Tuesday, down about 1.5% for the day, in a 52-week range of $1.18 to $2.49. Shares traded up about 0.4% in the short interest period, and days to cover rose from four to 11.

Plug Power Inc. (NASDAQ: PLUG) saw short interest drop by 12.4% to 30.49 million shares. Days to cover slipped from 12 to 11 and about 14.4% of the company’s shares are short. In the two weeks to July 13, the share price rose by 2.5%. The stock’s 52-week range is $1.53 to $3.21, and shares closed Tuesday at $1.91, down nearly 2.6% for the day.

Clean Energy Fuels Corp. (NASDAQ: CLNE) saw a drop of 10.7% in short interest to 3.09 million shares. About 3.7% of the company’s float was short, and days to cover remained unchanged at one. The share price tumbled by nearly 25% in the two-week period. The stock closed at $2.78 on Tuesday, down about 2.1% for the day, in a 52-week range of $1.31 to $4.05.

Pacific Ethanol Inc. (NASDAQ: PEIX) saw short interest fall by 7.5% in the short interest period to 709,479 shares, about 1.7% of the company’s float. Days to cover rose from one to two. The stock price fell 5.8% in the two weeks to July 13. Shares closed at $2.85 on Tuesday, up about 1.8% on the day, in a 52-week range of $2.30 to $7.50.

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