Quote:
Originally Posted by edslunch
I'm wondering why Wind/Solar + Hydrogen isn't discussed more. Green hydrogen can be produced during daylight hours and used in fuel cells in situ or elsewhere when renewable output is low or zero. Same as batteries, but it seems to me it would be cheaper to build longer-term storage, it's more portable, and could co-exist with blue hydrogen in an overall energy distribution network.
I get that there are efficiency losses to go from electricity to hydrogen and back again, but I would think that other benefits might balance. Curious if anyone has in depth knowledge about this.
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I'm order to store hydrogen as energy storage, you need to understand the losses so you can understand the economic feasibility. You lose 30% converting the electricity to hydrogen, you lose 10% compressing it, you lose some simply by storing it as it's the smallest molecule in existence and doesn't stay put well, then you lose 30% converting it back to electricity. That means you have at most 30% of the original energy left to put back into the grid. You'd need a lot of excess renewable generation to "fill" that storage for any significant gap, ie produce 3x what you'll need