Renewable energy from wind and solar is now competitive with the grid, opening up a trillion-dollar market for investors. Leases from SolarCity (NASDAQ:SCTY) or SunPower (NASDAQ:SPWR) with $0 down make solar power affordable and economical for homeowners. When added to Tesla Motors' (NASDAQ:TSLA) energy storage made at its gigafactory, the possibilities for disrupting the grid improve tremendously. 

Then there are massive power projects from First Solar (NASDAQ:FSLR), which are being passed down to new YieldCos like NRG Yield (NYSE:NYLD)

Motley Fool solar analyst Travis Hoium covers why this space is so exciting for investors and how they can play this billion-dollar opportunity. 

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Travis Hoium manages an account that owns shares of NRG YIELD INC and SunPower. He personally owns shares of SunPower and has the following options: long January 2015 $5 calls on SunPower, long January 2015 $7 calls on SunPower, long January 2015 $15 calls on SunPower, long January 2015 $25 calls on SunPower, and long January 2015 $40 calls on SunPower. The Motley Fool recommends SolarCity and Tesla Motors. The Motley Fool owns shares of SolarCity and Tesla Motors. Try any of our Foolish newsletter services free for 30 days.

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