This post made me think a bit.
Sorry
@Babin Farms kinda throwing you under the bus here
It's not personal
I went and researched a bit. Just a quick bit. To see how accurate that meme might be. I didn't want to muddy that thread (its too light hearted to throw this grenade in there), but wanted to discuss it at some level. Since we're already WAY off thread title topic here, I figured this would be a good place to put it.
So the premise of the meme is, the electricity we use to power EV's is still "dirty" because it comes from coal.......which at first hand looks pretty obvious. I was curious though; how true is that?
Essentially, I quickly googled the output of coal and natural gas power plants. Then I looked up the emissions of a single gallon of gasoline. I broke those down to an emissions per unit energy. This looks GOOD for gasoline, however I also need to consider the relative efficiency of the vehicles. This is to say, how much energy is required to travel a mile. An EV (a model 3 shown above, goes 1 mile with ~250Wh of energy used, while the national average vehicle goes 22 miles on ~3,370Wh of energy. That boiled down to the numbers on the right there that gets us to consistent units of kWh/mi. Finally, you multiply the CO2/kWh of the fuel with the kWh/mi of the vehicle, and you get a total CO2/mi number. Similar units that you can easily compare.
Here's what I worked out.
View attachment 175590
We can see that, on average, the EV is still a significant lower polluter, on a per mile basis as compared to an ICE. I thought this might be the case, however this clearly isn't an exhaustive analysis. It's just some simple back of the napkin math. It doesn't consider production CO2 generated by the mining process and other issues with manufacturing each vehicle. It doesn't account for the CO2 created in the transportation of the energy from the source (power plant, or oil field) to the final destination (storage on the vehicle).
I ran a few more scenarios to see how sensitive the values are. Someone always asks me to anyway when I do this kind of thing
This one assumes all coal electricity, and sees what kind of fuel economy "breaks even" with the EV.
View attachment 175591
This one checks a Rivian against my old Sierra. Assuming all coal electricity. Much closer results.
View attachment 175592
This is the first analysis again, but with electricity sources averaged.
View attachment 175593
Overall, I think it's just like the rest of the math we've run in this thread. You can swing the numbers either way depending on what assumptions you make and run with. Ultimately it does show, again, how much more efficient an EV is at turning energy into distance travelled. I think the last scenario really shows how the EV's benefit greatly from improved efficiencies upstream, where as the ICE is forced to maintain the same chemical reaction physics along the way.
Anywho, thanks for coming to my Ted/Math talk
Sources:
Gasoline CO2 values -> Greenhouse Gas Emissions from a Typical Passenger Vehicle | US EPA.
Power Plant CO2 Emissions ->
.