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NYC_SKP

(68,644 posts)
3. The money is in the middleman, owning the infrastructure. Hydrogen Claptrap.
Thu Feb 5, 2015, 12:54 AM
Feb 2015

I read the pertinent parts of RMI's myth #3, which don't support hydrogen battery electric, they only say that the inefficiency is not "prohibitive".


In competitive electricity markets, it may even make good economic sense to use hydrogen as an electricity storage medium. True, the overall round-trip efficiency of using electricity to split water, making hydrogen, storing it, and then converting it back into electricity in a fuel cell is relatively low at about 45% (after 25% electrolyzer losses and 40% fuel-cell losses) plus any by- product heat recaptured from both units for space-conditioning or water heating. But this can still be worthwhile because it uses power from an efficient baseload plant (perhaps even a combined- cycle plant converting 50–60% of its fuel to electricity) to displace a very inefficient peaking power plant (a simple-cycle gas turbine or engine-generator, often only 15–20% efficient).


It can be inferred from the statement above and other sections that grid electric to battery to traction is more efficient than grid power to hydrogen to fuel cell to traction.

But what do I know, except to have had dinner with Lovins' ex wife L. Hunter and a handful of friends one night after a small presentation and reception.

I know what her favorite Scotch whiskey is, that was fun!

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