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

First Solar Inc. (NASDAQ: FSLR) saw short interest rise by 1.1% to 6.16 million shares, which represents about 8% of the company’s float. Days to cover fell from three to two. In the two-week short interest period, the stock’s share price rose by about 13%. Its 52-week trading range is $25.56 to $71.80, and it closed at $68.84 on Wednesday, up about 1.2% for the day.

SunPower Corp. (NASDAQ: SPWR) short interest increased by 8.2% to 13.3 million shares, or 22.3% of the company’s float. In the short interest period, the share price rose by around 12.7%. The stock’s 52-week range is $5.84 to $11.70, and it closed at $8.79 on Wednesday, up about 1.2% for the day. Days to cover remained at three.

Canadian Solar Inc. (NASDAQ: CSIQ) saw a decrease of 23.7% in short interest during the two-week period. Some 5.3% of the total float, or 2.35 million shares, were short and days to cover fell from two to one. The company’s share price slipped by about 0.5% between the settlement dates, and shares closed Wednesday at $17.15, up 1.6% for the day, in a 52-week range of $10.86 to $19.09.

FuelCell Energy Inc. (NASDAQ: FCEL) posted an increase of 6% in short interest during the period. Some 9.17 million shares were short as of December 15. The stock closed at $1.71 on Wednesday, up about 1.2% for the day, in a 52-week range of $0.80 to $2.49. Shares traded up 18% in the short interest period, and days to cover remained at six.

Plug Power Inc. (NASDAQ: PLUG) saw short interest drop by 3.8% to 35.21 million shares. Days to cover fell from 11 to nine, and about 15.6% of the company’s shares were short. In the two weeks to December 15, the share price rose by about 1.9%. The stock’s 52-week range is $0.83 to $3.21, and shares closed Wednesday at $2.41, up about 0.4% for the day.

Clean Energy Fuels Corp. (NASDAQ: CLNE) saw a decline of about 0.6% in short interest to 5.29 million shares. About 0.6% of the company’s float was short and days to cover remained at five. The share price fell by about 6.4% in the two-week period. The stock closed at $2.09 on Wednesday, up about 1% for the day, in a 52-week range of $1.96 to $3.29.

Pacific Ethanol Inc. (NASDAQ: PEIX) saw short interest fall by 6.5% in the period to 851,501 shares, about 2% of the company’s float. Days to cover rose from two to three. The stock price dropped about 2.2% in the first two weeks of December. Shares closed at $4.45 on Wednesday, down about 2.2% on the day, in a 52-week range of $4.10 to $10.05.

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