Short interest among solar and alternative energy stocks was mixed during the two-week reporting period that ended on April 15. During that period, share prices rose for all the stocks we cover in a range of from about 3.5% to 35.0%.

First Solar Inc. (NASDAQ: FSLR) saw short interest decrease by about 9.7% to 7.21 million shares, which represents 9.8% of the company’s float. Days to cover slipped to 3.4. In the two weeks to April 15, shares rose about 5%. The stock’s 52-week trading range is $39.18 to $73.78, and it closed at $63.43 on Friday, down about 2% for the day.

SunEdison Inc. (NYSE: SUNE) showed a drop of 2.5% in short interest to 80.58 million shares. About 29.8% of the company’s float is now short, and days to cover slipped to 10.6. In the latest short interest reporting period, the share price rose more than 10%. The stock closed at $26.61 Friday, in a 52-week range of $13.09 to $27.74. The high was posted on Friday.

SunPower Corp. (NASDAQ: SPWR) short interest fell by 7.2% to 5.47 million shares, or 10.5% of the company’s float. In the two-week short interest period, shares rose more than 6%. The stock’s 52-week range is $22.75 to $42.07, and it closed at $33.97 on Friday, down about 2.5% for the day. Days to cover slipped to 3.9.

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SolarCity Corp. (NASDAQ: SCTY) saw a short interest rise by 2.8% to 19.36 million shares, or 33.6% of the company’s total float. Days to cover fell to six. In the period, shares jumped by nearly 12%. The stock’s 52-week range is $45.79 to $79.40, and shares closed at $60.00 Friday, down fractionally for the day.

Canadian Solar Inc. (NASDAQ: CSIQ) saw a rise of 0.4% in short interest in the two-week period to April 15. Some 9.7% of the total float, 4.03 million shares, are short, and days to cover slipped to 1.8. The company’s shares rose about 7.5% in the period. Shares closed Friday night at $36.36, down about 0.4% for the day, in a 52-week range of $18.68 to $41.12.

FuelCell Energy Inc. (NASDAQ: FCEL) had a rise of 2.4% in short interest during the two-week period. About 13.3% of the company’s float, 32.6 million shares, is short, and days to cover rose to 9.6. In the short interest period, the shares gained about 4%. The stock closed at $1.30 on Friday, in a 52-week range of $1.05 to $2.84.

Plug Power Inc. (NASDAQ: PLUG) saw short interest drop by 3.2% to 30.79 million shares. Days to cover rose slightly to 9.2, and about 17.9% of the company’s shares are short. In the two weeks to April 15, the stock’s share price rose about 3.7%. The stock’s 52-week range is $2.42 to $6.47, and shares closed Friday at $2.65, down about 0.8% for the day.

Clean Energy Fuels Corp. (NASDAQ: CLNE) saw a drop of 4.2% in short interest to 16.44 million shares. About 23.3% of the company’s float is short, and days to cover fell to 12.4. Shares rose about 35% in the two-week period. The stock closed at $8.07 on Friday, in a 52-week range of $3.99 to $11.79. The share price rose by about 5.5% on Friday.

Pacific Ethanol Inc. (NASDAQ: PEIX) saw short interest fall by 4.8% in the two-week period to 4.03 million shares, about 17.1% of the company’s float. Days to cover slipped to 5.6. The stock price rose about 10.6% in the two weeks to April 15. The stock closed at $12.03 on Friday, down about 3.3% on the day, in a 52-week range of $7.51 to $23.97.

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