"But a lot of the new plants are replacing older ones, " says Brian Potskowski of BNEF.
CNN: Shale gas boom sparks EU coal revival
Defining clean energy companies can be tricky, and most industry observers such as BNEF use lists of technologies.
FORBES: Top Performing Clean Energy Funds in 2010
Gas-fired power plants supplied 31 percent of U.S. electricity in 2012, according to BNEF, up from 22 percent five years ago.
FORBES: U.S. Carbon Emissions Dip To 1994 Levels
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