These clean energy funds have more than doubled this year — here's what they own

Solar panels above a Brooklyn neighborhood overlooking Manhattan.
Jeff Morganteen | CNBC

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In a year of ups and downs for the market, one area stands out: clean energy.

Companies engaged in all areas of renewable energy — from solar panel installers to wind blade manufacturers to electric automakers — have seen their stocks soar this year amid investor enthusiasm, favorable economics and expected policy support. And as these stocks jumped to record highs, so have the funds that track them.

Here's a look at some of the clean energy exchange-traded funds that have more than doubled this year: