AndiHutch @ AndiHutch @lemmy.zip

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I would say it is mostly an awareness thing. Electric vehicles are thought of as the best for the environment and people aren't really aware or don't care that they can cut their Co2 related output by about ~50% with their existing ICE vehicle. People just don't know that they can choose to use a different fuel and have environmental benefits that way because no one from the car makers to the gas pumps really advertised or educated them on it.

A few car makers did have branded Flex fuel cars but really they were only branded that way to take advantage of a poorly crafted government tax credit. Many existing cars that can run e85 have no indication that they can run it and run cleaner with it which can lead to less maintenance issues and make the mechanic's job easier.

With that said ethanol is in some respects a worse fuel, since it attracts water which doesn't play nice with burning and as you mentioned is not as dense, but it is a much better fuel from an environmental perspective. Neither of those issues are deal breaker's since you can just fill up a little more often or add a fuel additive occasionally to dehydrate the fuel.

I also think maybe the politics of farm subsidies for corn and ethanol are also somewhat of an issue, since massive government subsidies for corn growing and ethanol production are unfairly distorting the market quite a bit. But then again that's par for the course compared with oil.

I have heard that most of the producers of ethanol have been bought out and taken over by oil companies, so I wouldn't expect them to make a serious effort to promote it's benefits or compete well since the oil companies wouldn't like that.

Yeah I looked it into a bit recently, and found it very interesting mostly on the basis of production per acre. Are you planning on solar for the home's energy or some other source? Now that I think about it something like biomass would work quite well as a supplemental energy source for the winter when the sun isn't out much. If you are going for solar will you have a battery system as well for evenings / winter or are you grid-tieing for that?

Processing the biomass could take some planning if you produce it on a large scale. I ran some rough numbers for total energy production per acre per year for giant miscanthus and it is quite shockingly high. It takes 2-3 years to get established but once it does it is a powerhouse. It can produce 15-20 tons (short) of biomass per acre depending on growing climate/conditions once it is fully established. With 20t/acre, it has a 17 MJ/kg LHV(heat from burning) and it would contain about 85,679 kWh of energy; At 40% electrical conversion efficiency, you can expect around 34,271 kWh of usable electrical energy. That's enough to power and heat 3-4 houses if you burn it in a CHP power plant.

So you could potentially plant 1/3 - 1/4 acre of a home's yard and have easily have enough biomass to heat and/or power a home. Definitely could be worth looking into giant miscanthus (wiki link) depending on the area and site. Being a plant, it tends to produce more the warmer the weather is in the area as long as it has sufficient water to grow. At that scale all you would probably need is a scythe, a shed, and a fireplace for heat. A small hay-baler might be nice too, even if not strictly necessary. It may not be as efficient per area as solar but I imagine is a whole lot cheaper.

I also read that with torrefaction it could be a drop-in fuel for existing coal plants which would be stellar from an environmental perspective. I think it would compliment solar well particularly in the winter when you burn excess harvested sun for heat so you could have a battery / fuel usage then for when you can't produce any energy. Anyway I hope you / someone finds it useful. I hope I didn't overshare, I feel like I wrote a book lol.

Edit: I'd also be interested in hearing about your planned house. I have read about house building some from an energy use / conservation perspective and found it interesting. Have you read / heard about Passive House's? I suspect they overlap pretty well with carbon negative housing in general.

Good suggestions. Speaking of carbon negative and biogas digesters, have you heard of Giant miscanthus? It is both carbon fixing a great feedstock for biomass energy. It is a lot more productive per area planted than a wood would(heh) be since it is a fast growing perennial grass. It stores a lot of carbon and nutrients in it's roots which it then reuses to regrow when warmer weather comes.