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Here we present a list of five clean energy companies that have recently seen significant increases in shares shorted, month-over-month. These stocks have also seen mean analyst rating downgrades over the past three months.

Analyst ratings, sourced from Reuters, are presented on a linear scale, where 1 = "Strong Buy" and 5 = "Strong Sell." All of the stocks mentioned below have seen their ratings move closer to 5 over recent months, i.e. worsening analyst sentiment.

Do you think this pessimism is temporary, or is this the beginning of a greater trend for these companies? Full details below.

Short data sourced from Yahoo! Finance, analyst rating data sourced from Reuters, all other data sourced from Finviz.

List sorted by change in shares shorted.

1. Nalco Holding Co. (NYSE:NLC): Synthetics Industry. Market cap of $3.63B. Shares shorted have increased 25.25% month-over-month (from 2.02M to 2.53M shares shorted). Mean analyst rating was downgraded over the past three months from 1.93 to 2.35. The stock has gained 10.56% over the last year.

2. Covanta Holding Corporation (NYSE:CVA): Electric Utilities Industry. Market cap of $2.54B. Shares shorted have increased 22.75% month-over-month (from 6.11M to 7.50M shares shorted). Mean analyst rating was downgraded over the past three months from 1.91 to 2.08. The stock is a short squeeze candidate, with a short float at 5.1% (equivalent to 6.29 days of average volume). The stock has lost 2.41% over the last year.

3. Westport Innovations Inc. (NASDAQ:WPRT): Pollution & Treatment Controls Industry. Market cap of $828.48M. Shares shorted have increased 21.03% month-over-month (from 1.95M to 2.36M shares shorted). Mean analyst rating was downgraded over the past three months from 2.75 to 3. The stock has had a good month, gaining 12.11%.

4. Alliant Energy Corporation (NYSE:LNT): Diversified Utilities Industry. Market cap of $4.50B. Shares shorted have increased 14.21% month-over-month (from 954.40K to 1.09M shares shorted). Mean analyst rating was downgraded over the past three months from 2.12 to 2.33. The stock has gained 28.06% over the last year.

5. Tesla Motors, Inc. (NASDAQ:TSLA): Auto Manufacturer. Market cap of $2.31B. Shares shorted have increased 13.63% month-over-month (from 7.85M to 8.92M shares shorted). Mean analyst rating was downgraded over the past three months from 2.6 to 3. Short float at 19.73% (equivalent to 5.74 days of average volume), implying the stock is a short squeeze candidate.

Source: 5 Clean Energy Stocks Being Affected by Bearish Sentiment