Earthtechling is a participant in the Amazon Services LLC Associates Program. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates. The rapid growth of renewables as an energy source has rightly caught investors' attention. Hydrogen fuel cells, in particular, have managed to garner phenomenal interest. Stocks of Plug Power (NASDAQ: PLUG), Bloom Energy (NYSE: BE), and FuelCell Energy (NASDAQ: FCEL) skyrocketed in 2020.