Comment on New York Startup Builds Fridge-Sized Machine That Can Turn Air Into Gasoline
jj4211@lemmy.world 15 hours agoEven then, the value prop is questionable.
It treats sustainable energy dedicated to this purpose as “free”, ignoring the opportunity cost of using that energy directly.
For example, let’s say I decided my solar exclusively to making gasoline. I could get about 14 gallons a month of “free” gasoline… Except my home power bill would go up about 150 dollars a month… opportunity cost would be over 10 dollars a gallon…
Passerby6497@lemmy.world 14 hours ago
Sure, for a homeowner it doesn’t make sense. But what about at grid scale when there isn’t enough demand for that electricity?
What opportunity cost is there to NOT do it when the power would otherwise be wasted or generation capacity reduced? If anything, I’d say the opportunity cost is of not doing this with over generation on the grid/plant
jj4211@lemmy.world 13 hours ago
How much do we have an over generation problem in general though? I suppose the argument would be that solar is curtailed because they don’t want to deal with the potential for overgeneration, but we already have a number of approaches for energy storage. Their pricing for generating at most a gallon a day is a price exceeding a battery system of LFP that could do a lot more than a gallon of gas. This is ignoring the rather significant potential of Sodium batteries.
So this doesn’t look to be cheaper than battery systems, it looks to be way less efficient than battery systems. The biggest use case as energy storage in general seems to be if you want it to spend a few months (but not too many months, fuel degrades in the tank after all). The more narrow use case is to cater to scenarios where you absolutely need the energy density of gasoline, so boats and airplanes critically so, maybe some heavy equipment. I’ll grant that, but if particularly sodium batteries will be an acceptable approach, it’ll be better than this solution in that very wide variety of circumstances.
NotMyOldRedditName@lemmy.world 11 hours ago
Over generation is big. I agree batteries are better, though.
We need to be to support peak winter heating and peak summer cooling.
Everything in between we have excess power, unless it’s something like hydro dams which are easy to control.
We generally use gas peaker plants to help which we can turn off or on, but it’s more efficient to not do that, and those are expensive.
It would also make it easier to build big nuclear plants if we could manage the off peak load into batteries for the day.