Solar panels on land used for biofuels could power all cars and trucks electric(ourworldindata.org)

20 pointsby alphabetatango16 hours ago3 comments

belviewreview6 minutes ago
Here's a company actually doing this https://www.terraformindustries.com/
GlibMonkeyDeath12 hours ago
Not surprising at all - photovoltaics yield about 50 W/m2 on average at mid-ish latitudes. Last time I checked (see below) biofuels are around 100x less efficient per acre (and in the case of algae-based biofuel, have a lot of post-processing that make them even less attractive.)
1 acre of corn ~ 500 gallons of ethanol (~6kWh/Liter for ethanol) so 50046e3 = 12 MWh/4046 m^2 ~ 3000 Wh/m^2 for corn. If there is one growing season per year, then that energy is spread over 24*365 hours. So about 0.3 W/m2 on average.
Of course, the ethanol can be stored, and has a pretty awesome energy density. So it isn't completely stupid (e.g. aircraft are a thing), although it is pretty stupid.
Ronsenshi14 hours ago
I'm not sure electric trucks that run off of batteries is a practical solution. Given the size and weight of trucks and cargo they require 10-15 times larger battery to provide noticeably smaller range. Throw in refueling time and it's really not the best solution for CO2 reduction. I'd prefer to see hydrogen-powered trucks. Use all that extra energy to produce hydrogen.
Naturally this is relevant only for current battery tech and capacity.
- belviewreview2 minutes ago
  Actually for most trucking batteries are already practical. Most trucks travel only one or two hundred miles a day, like doing deliveries or going from a port to a warehouse, or a warehouse to a location like a factory or store. And even long-range trucking is mostly with loads that are volume constrained, not weight, so the additional weight of batteries is not a big problem. The big advantage of batteries is lower cost per mile
- _aavaa_14 hours ago
  This is an often repeated talking point, but the reality on the ground has proven hydrogen vehicles to be failures every time they are tried.
  Hydrogen trials outright fail or prove to be substantially more expensive overall than EVs every time they’re tried.
  The hydrogen vehicles are more complicated, more expensive, have expensive fuel which is difficult to transport and store, have no economies of scale or a realistic path to on (unlike batteries and electric motors), introduce serious safety concerns, and lack the convenience of being able to refuel on site.
  And EV trucks, like in every other category, are outselling hydrogen trucks by orders of magnitude. See recent China sales [0].
  [0]: https://cleantechnica.com/2025/11/26/chinas-bev-trucks-and-t...
  - Someone13 hours ago
    EV trucks got a head start because we already have extensive electricity networks, though. That makes rolling out charging stations a lot easier than rolling out a hydrogen distribution network (the existing network to distribute gasoline will not work because it’s made for fluids, that of natural gas won’t work either because hydrogen molecules are so small, and the natural gas distribution network often doesn’t have the necessary density)
    Because of that, EV trucks might be a local optimum.
    Having said that, hydrogen is difficult to handle. To get reasonable power density, you have make it liquid, compress it, or do both. Purely liquid is impractical, given that it happens at 33K at normal room temperature, so you need pressure, lots of it.
    _aavaa_6 hours ago
    Yes, and the energy required to compressed it to liquid form is immense, leading to high costs.
    And until it’s made from something other than methane it won’t be a climate solution. In fact hydrogen production is a major climate problem that should be solved first before we consider wasting any green hydrogen on something that can be done cheaper with electricity.