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

First Solar Inc. (NASDAQ: FSLR) saw short interest decline by 1.7% to 10.48 million shares, which represents about 14% of the company’s float. Days to cover rose from seven to eight. In the two-week short interest period, the stock’s share price dipped by about 3.3%. Its 52-week range is $36.51 to $81.72, and it closed at $52.38 on Wednesday, up about 0.9% for the day.

SunPower Corp. (NASDAQ: SPWR) short interest decreased by 3.6% to 22.67 million shares, or 37.1% of the company’s float. In the two weeks to February 15, the share price increased by about 1.4%. The stock’s 52-week range is $4.55 to $10.00, and it closed at $6.44 on Wednesday, down about 0.2% for the day. Days to cover dropped from 16 to 10.

Canadian Solar Inc. (NASDAQ: CSIQ) saw a decrease of 5.3% in short interest during the first two weeks of February. Some 6.7% of the total float, or 2.99 million shares, were short, and days to cover fell from four to three. The company’s shares traded down 4.6% over the period, and shares closed Wednesday at $24.19, up about 1.4% for the day, in a 52-week range of $11.37 to $25.02.

Bloom Energy Corp. (NYSE: BE) short interest rose by 9.1% in the short interest period. Some 4.62 million shares were short, representing 32.5% of the company’s total float. Days to cover fell from five to three, and the stock price dropped by about 3.1% during the two weeks. Shares closed Wednesday at $13.80, down about 6.1% for the day, in a 52-week range of $8.88 to $38.00.

FuelCell Energy Inc. (NASDAQ: FCEL) posted a drop of 8.5% in short interest during the period. Some 15.18 million shares were short as of February 15, about 14.8% of the total float. The stock closed at $0.47 on Wednesday, up about 3.3% for the day, in a 52-week range of $0.43 to $2.11. Shares traded up about 19% in the first two weeks of this month, and days to cover decreased from 12 to eight.

Plug Power Inc. (NASDAQ: PLUG) saw short interest increase by 0.6% to 39.04 million shares. Days to cover dipped from 20 to 15, and about 16.9% of the company’s shares were short. In the two weeks to February 15, the share price jumped by about 13.5%. The stock’s 52-week range now is $0.99 to $2.27, and shares closed Wednesday at $1.79, up about 1.1% for the day.

Clean Energy Fuels Corp. (NASDAQ: CLNE) saw a drop of 9.8% in short interest to 2.99 million shares. About 2.2% of the company’s float was short, and days to cover slipped from eight to seven. The share price was unchanged in the period, although it dipped about 10% before regaining its starting point. The stock closed at $2.24 on Wednesday, up about 2.3% for the day, in a 52-week range of $1.31 to $4.05.

Pacific Ethanol Inc. (NASDAQ: PEIX) saw short interest tumble by 33.8% in the two-week period to 390,895 shares, about 0.9% of the company’s float. Days to cover remained unchanged at two. The stock price dropped by about 8.9% between the settlement dates. Shares closed at $1.15 on Wednesday, down about 0.9% for the day, in a 52-week range of $0.76 to $4.15.

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