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Jeremy Michalek @jmichalek.bsky.social · 16d

signatory @jfdecarolis.bsky.social also on bsky!

Jeremy Michalek @jmichalek.bsky.social · 16d

EPA's proposal: www.epa.gov/regulations-...
Our comment: www.cmu.edu/cit/veg/publ...
Brief summary: www.cmu.edu/cit/veg/publ...

w/ @paulijllo.bsky.social @costasamaras.com et al.

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Jeremy Michalek @jmichalek.bsky.social · 16d

Today we submitted our public comment on critical flaws in EPA's rationale for rescinding its authority to regulate greenhouse gas emissions.

This proposed move is a big deal with profound implications for our future. Today's the last day to comment. www.cmu.edu/cit/veg/publ...

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Reposted by Jeremy Michalek

Destenie Nock, PhD @destenie.bsky.social · 29d

Transportation + electricity = most U.S. emissions. EVs can cut both—if we don’t slam the brakes on investments.

Jeremy Michalek @jmichalek.bsky.social · Sep 8

Our new @pnas.org study, out today, finds #EVs are not only clean cars, they can be catalysts in building a cleaner power grid too. Here's what that means for the U.S.

study /w Lily Hanig, @destenie.bsky.social & @cdharper.bsky.social www.pnas.org/doi/10.1073/...

Trump reversed policies supporting electric vehicles − it will affect the road to clean electricity, too

An analysis finds that fewer electric vehicles will also mean less investment to clean up the electricity sector.

theconversation.com

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Jeremy Michalek @jmichalek.bsky.social · Sep 8

Our new @pnas.org study, out today, finds #EVs are not only clean cars, they can be catalysts in building a cleaner power grid too. Here's what that means for the U.S.

study /w Lily Hanig, @destenie.bsky.social & @cdharper.bsky.social www.pnas.org/doi/10.1073/...

Trump reversed policies supporting electric vehicles − it will affect the road to clean electricity, too

An analysis finds that fewer electric vehicles will also mean less investment to clean up the electricity sector.

theconversation.com

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

Still, if I were going to fast charge a lot, I'd prefer LFP.

LFP tends to be used on the lower-range EVs, which are the ones we need to fast charge more often (bonus!).

If I were buying a used EV, I'd also feel batter about an "iron-clad" LFP battery. It keeps going and going and going...

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

Automakers design battery management systems to protect against early death (e.g. by slowing charging or using less of the battery's capacity), so our standardized lab tests don't necessarily mean that fast charging your NCA/NMC EV will kill its battery.

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

LFP is cheaper and relies on fewer critical materials (www.nature.com/articles/s41...). Its main disadvantage is lower energy density (shorter range). But since LFP can take so much more abuse, more of its capacity can be used in practice, reducing or eliminating its key weakness

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

Replacing the battery every time it died would be prohibitively expensive in the extreme cases

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

Restricting the portion of the battery's capacity that the vehicle can use (as automakers do) can make NMC and NCA batteries last longer, at the cost of reduced range

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

When we used the entire battery capacity
- Fast charging killed NCA batteries (bottom, used in long range Teslas) rapidly.
- Heavy fast charging also killed NMC batteries (middle, used by most US automakers).
- LFP batteries (top, used in standard range Teslas) can take the abuse.

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

We cycled NMC, NCA and LFP batteries (the 3 types used in today's EVs) with varying amounts of slow charging (e.g. at home, level 2) and fast charging (e.g. highway rest stop, DCFC).

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

Will fast-charging kill your EV battery?

We have some answers in our new study, out today
www.sciencedirect.com/science/arti...

w/ Hannah Morin, Jay Whitacre; @cmu.edu

Quantifying the degradation cost of frequent fast charging across multiple electric vehicle battery chemistries

We investigate the relative impact of fast charging on degradation in commercial lithium-ion battery cells with electric vehicle-relevant chemistries …

www.sciencedirect.com

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Jeremy Michalek @jmichalek.bsky.social · Jun 12

TNCs generally increase VMT relative to personal vehicle travel unless (1) more rides are pooled or (2) personal vehicle travel requires *very* extensive search for parking.

Jeremy Michalek @jmichalek.bsky.social · Jun 12

We don't have exactly that comparison in the study, but broadly TNC electrification addresses a smaller portion of externality costs than VMT reduction (because of congestion and collision costs).

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Jeremy Michalek @jmichalek.bsky.social · May 28

“Superb” from Granger Morgan’s take

Jeremy Michalek @jmichalek.bsky.social · May 28

Superb piece by David Victor in @foreignaffairs.com on the strategic national importance of innovation investment, incl. stability, pipeline of ideas, people & scale. www.foreignaffairs.com/united-state...

Trump Is Killing American Innovation

China will reap the benefits.

www.foreignaffairs.com

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Jeremy Michalek @jmichalek.bsky.social · May 14

@destenie.bsky.social

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Jeremy Michalek @jmichalek.bsky.social · Apr 18

@destenie.bsky.social

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Reposted by Jeremy Michalek

Destenie Nock, PhD @destenie.bsky.social · Mar 14

During extreme heat events, urban travelers adjust their transportation choices unequally. Using NY City ride-hailing data, we find wealthy neighborhoods increased trip freq at higher rates than low-income areas. W/ @jmichalek.bsky.social & @cdharper.bsky.social
www.sciencedirect.com/science/arti...

Analyzing disparities in app-hailed travel during extreme heat in New York City

To understand extreme weather effects on travel behavior, we examine changes in New York City app-hailed travel during extreme-heat days and estimate …

www.sciencedirect.com

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Jeremy Michalek @jmichalek.bsky.social · Mar 1

Made me want to vomit

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Jeremy Michalek @jmichalek.bsky.social · Feb 27

Another example of work I presented at TRB recently that could be targeted now.

We found that ride-hailing technology mitigates effects of driver racial discrimination, but effects of residential segregation persist

www.pnas.org/doi/10.1073/...

www.pnas.org

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Jeremy Michalek @jmichalek.bsky.social · Feb 27

Massive implications

Jeremy Michalek @jmichalek.bsky.social · Feb 4

Slow down, and stop breaking things you don’t know how to fix

www.nytimes.com/2025/02/03/u...

Elon Musk’s Blitz Shakes U.S. Government as He Sweeps Through Agencies

The billionaire is creating major upheaval as his team sweeps through agencies, in what has been an extraordinary flexing of power by a private individual.

www.nytimes.com

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Jeremy Michalek @jmichalek.bsky.social · Jan 22

Trump signs exec order on 1st day back to “eliminate the EV mandate”.

There was no national EV mandate, but changes to EPA standards and a successful revocation of California’s waiver to set its own policy would have big effects for the country’s top GHG-emitting sector.

I discuss w/ PolitiFact:

MAGA-Meter: Trump's Second Term: | PolitiFact

PolitiFact is a fact-checking website that rates the accuracy of claims by elected officials and others on its Truth-O-Meter.

www.politifact.com

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