Short interest among the solar and alternative energy stocks we cover made some modest moves in the two-week reporting period that ended on January 15. Short interest in two solar stocks rose, while short sellers appeared to lose interest in two others. However, in the alternative fuel space, short interest soared in the ethanol stock we track. Ethanol prices have staggered a bit as crude oil prices continue to fall.

First Solar Inc. (NASDAQ: FSLR) saw short interest rise by 9.7% to 8.77 million shares, which represents 12% of the company’s float. Days to cover remained at three. In the two-week short interest period to January 15, shares fell nearly 10%. The stock’s 52-week range is $39.18 to $74.84, and it closed at $43.72 on Tuesday.

SunEdison Inc. (NYSE: SUNE) faced an increase of 7.7% in short interest, to 80.96 million shares. About 30.1% of the company’s stock was short and the days to cover fell to seven. In the latest two-week short interest reporting period, shares fell about 0.5%. The stock closed at $19.83 Tuesday night, in a 52-week range of $13.09 to $24.35.

SunPower Corp. (NASDAQ: SPWR) short interest fell by 1% to 10.43 million shares, or 19.9% of the company’s float. In the two-week period, shares fell by about 4.7%. The stock’s 52-week range is $22.75 to $42.07, and it closed at $25.37 on Tuesday. Days to cover fell to four.

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SolarCity Corp. (NASDAQ: SCTY) saw a short interest fall by 4.1% to 19.73 million shares, or 34.8% of the company’s total float. Days to cover declined to eight. In the short interest period, shares fell nearly 10%. The stock’s 52-week range is $45.79 to $88.35, and shares closed at $50.10 Tuesday.

Canadian Solar Inc. (NASDAQ: CSIQ) saw a drop of 1.2% in short interest in the first two weeks of January. Some 13.2% of the stock, 5.47 million shares, was short, and the days to cover rose to three. The company’s shares retreated about 12% in the period. Shares closed Tuesday at $20.36, in a 52-week range of $18.68 to $44.50.

FuelCell Energy Inc. (NASDAQ: FCEL) had a decline of 4.2% in short interest during the two-week period. About 13.2% of the company’s stock, 31.02 million shares, was short and the days to cover fell to seven. In the two-week short interest period, the shares dropped more than 26%. The stock closed at $1.34 on Tuesday, in a 52-week range of $1.05 to $4.74.

Plug Power Inc. (NASDAQ: PLUG) saw short interest fall by 4.7% to 31.46 million shares. The days to cover rose to seven, and about 18.8% of the company’s shares were short. In the two weeks, the stock’s share price fell 11%. The stock’s 52-week range is $2.48 to $11.72, and shares closed Monday at $3.18.

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Clean Energy Fuels Corp. (NASDAQ: CLNE) saw a rise of just 0.3% in short interest to 16.65 million shares. About 23.7% of the company’s shares were short, and the days to cover rose to 12. Shares pulled back 12.5% in the two-week period. The stock closed at $4.41 on Tuesday, in a 52-week range of $4.18 to $12.15.

Pacific Ethanol Inc. (NASDAQ: PEIX) saw short interest rise by 31.7% in early January to 3.97 million shares, about 17.4% of the company’s float. The days to cover remained unchanged at three. The stock price fell more than 21% during the period, and shares closed at $9.26 on Tuesday. They have traded in 52-week range of $6.16 to $23.97.

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