There are hundreds of shades of gray when it comes to green energy firms. Some are packaged in mutual funds that have verdant names, but don't track solar, biofuel and other alternative power companies well.
The anything-but-petroleum energy frenzy has driven stock prices of some hyped companies into overdrive. It's hard not to get caught up in the excitement over alternative energy. More than 50 ethanol plants are under construction as part of an expected $60 billion surge of total capital spending in green energy this year, up from $48 billion last year, according to New Energy Finance Ltd., a research firm in London, which predicts the renewable energy business will grow from a ``25 billion to a $100 billion industry worldwide over the next decade.''
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