The biggest holdings of the Invesco WilderHill Clean Energy E.T.F. are producers of raw materials for solar cells and rechargeable batteries or builders and operators of large-scale solar projects. The $2.9 billion fund yields 0.49 percent and has an expense ratio of 0.7 percent.

The First Trust NASDAQ Clean Edge Green Energy Index Fund focuses on applied green technology. Its biggest holdings are Tesla, the American maker of electric automobiles; NIO, a Chinese rival in that field; and Plug Power, which makes hydrogen fuel cells for vehicles. Also a $2.9 billion fund, it yields 0.24 percent and has an expense ratio of 0.6 percent.

The First Trust Global Wind Energy E.T.F., as its name suggests, targets wind turbine manufacturers and servicers, led by the Spanish-German joint venture Siemens Gamesa Renewable Energy and Vestas Wind Systems of Denmark, as well as operators such as Northland Power of Canada. This $423 million fund yields 0.92 percent and has an expense ratio of 0.61 percent.


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