Short interest moves among solar and alternative energy stocks were mixed during the two-week reporting period that ended on August 15. Of the companies we watch, short interest rose on all three solar stocks and on two of four alternative energy stocks.

First Solar Inc. (NASDAQ: FSLR) saw short interest increase by 1% to 11.05 million shares, which represents about 14.3% of the company’s float. Days to cover rose from three to seven. In the two-week short interest period, the stock’s share price added about 0.5%. Its 52-week trading range is $25.56 to $50.21, and it closed at $47.20 on Thursday, up about 0.7% for the day.

SunPower Corp. (NASDAQ: SPWR) short interest increased by 0.1% to 15.27 million shares, or 25.9% of the company’s float. In the short interest period to August 15, the share price tumbled about 13.7%. The stock’s 52-week range is $8.74 to $9.91, and it closed at $9.21 on Thursday, up about 0.2% for the day. Days to cover remained unchanged at four.

Canadian Solar Inc. (NASDAQ: CSIQ) saw an increase of 4.4% in short interest during the period. Some 12.5% of the total float, or 5.54 million shares, were short, and days to cover remained unchanged at four. The company’s share price rose about 1% over the two weeks, and shares closed Thursday at $15.57, up about 0.4% for the day, in a 52-week range of $10.25 to $18.12.

FuelCell Energy Inc. (NASDAQ: FCEL) posted a decrease of 2.1% in short interest during the period. Some 6.43 million shares were short as of August 15. The stock closed at $1.47 on Thursday, up about 0.7% for the day, in a 52-week range of $0.80 to $5.67. Shares fell nearly 8% in the short interest period, and days to cover rose from five to nine.

Plug Power Inc. (NASDAQ: PLUG) saw short interest rise by 4.7% to 41.86 million shares. Days to cover rose from six to nine, and about 19% of the company’s shares were short. In the two weeks to August 15, the share price fell by more than 9%. The stock’s 52-week range is $0.83 to $2.70, and shares closed Thursday at $2.17, up nearly 2% for the day.

Clean Energy Fuels Corp. (NASDAQ: CLNE) saw an increase of about 0.4% in short interest to 10.53 million shares. About 8.2% of the company’s float was short, and days to cover remained unchanged at eight. The share price fell by about 19% in the first two weeks of August. The stock closed at $2.29 on Thursday, up about 0.4%, in a 52-week range of $2.18 to $4.80.

Pacific Ethanol Inc. (NASDAQ: PEIX) saw short interest tumble by 22% to 1.1 million shares, about 2.6% of the company’s float. Days to cover fell from two to one. The stock price dropped more than 26% in the two weeks to August 15. Shares closed at $4.25 on Thursday, unchanged on the day, in a 52-week range of $4.150 to $10.95.

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