Share this page!

Enter URL or ID to Unroll

You can paste full URL like: https://x.com/threadreaderapp/status/1644127596119195649
or just the ID like: 1644127596119195649

How to get URL link on X (Twitter) App

  1. On the Twitter thread, click on or icon on the bottom
  2. Click again on or Share Via icon
  3. Click on Copy Link to Tweet
  4. Paste it above and click "Unroll Thread"!
  5. More info at Twitter Help
Colin Murphy Profile picture
Colin Murphy
@scianalysis
Deputy Director at #UCDavis Policy Institute for Energy, Environment, and the Economy. Clean fuels, #climatechange policy, #scicomms. Thoughts are my own.
Feb 19, 2024 • 33 tweets • 7 min read
The LCFS team at @ITS_UCDavis is happy to announce the release of new research on the proposed LCFS amendments and recent alt. fuel developments. Just in time for a relaxing holiday afternoon read, or y'know, the upcoming LCFS comment deadline. Long🧵

escholarship.org/uc/item/5wf035… Paper is still in manuscript form, but the substantive material is final and only changes should be copyediting and layout. Big thanks to my colleagues Jin Wook Ro and Julie Witcover for helping get a significant update to the FPSM model and subsequent report produced quickly. 2/
Nov 28, 2022 • 16 tweets • 4 min read
Good thread from @noahqk on the debate over ethanol. I wanted to add a bit of perspective from the fuel policy wonk world. 1/ First, a clarification: Ethanol's first entry into fuel was as an oxygenate, replacing MTBE, but you only need around 7.4% (by volume) ethanol to achieve oxygenation targets so the extra 2.6% is largely due to fuel policy and/or underlying economics. 2/
Jan 31, 2021 • 22 tweets • 13 min read
@daveregrets @bradplumer Been a while since I've put out a good tweet thread and this is a nice juicy subject for one. Thanks @daveregrets for flagging this. TL;DR version: It's not nearly the comprehensive review it claims to be, but the conclusions are generally sound. 1/ @daveregrets @bradplumer My biggest issue with this is that it claims to be a lit review / meta-analysis (thought a somewhat informal one, which is totally fine since there isn't a ton of lit in this space), but most of the cases they find are different versions of GREET. 2/
May 14, 2020 • 4 tweets • 1 min read
Great thread on solar costs. The only thing I'd add is that the secret sauce for rapid cost reductions appears to be scale. Both solar and Li-ion batteries have massively exceeded expectations about cost decline (maybe wind has, too). The common thread, to me, is scale. 1/ Policies like the RPS for solar and ZEV Mandate for Li-ion batteries (with a big assist from the emergence of cellphones and laptops) created enough of a guaranteed market that early players could invest at commercial scale. 2/
Dec 11, 2019 • 17 tweets • 5 min read
New report on medium and heavy duty vehicle transitions in California just released, from @Cal_ETC @NRDC @UCSUSA @Earthjustice and others. @ICF was the lead author. This is a comprehensive, deep-dive into costs & benefits of different approaches.

caletc.com/comparison-of-… 1/ Image It's really, really hard for the MD/HD sector in California to meet 2030 GHG targets without aggressive electrification. RNG can play a role, but projections of total supply indicate limited potential resource, enough to displace a few hundred million gal of diesel. 2/
May 14, 2019 • 17 tweets • 4 min read
In light of recently released report regarding effects of ride-hailing (e.g. Lyft, Uber) on congestion, I wanted to highlight some work by @ITS_UCDavis scholars on the subject and offer a couple of perspectives. (This great infographic came out of ITS research)
1/ First, the study (available here: advances.sciencemag.org/content/5/5/ea…) reinforces the results of multiple other researchers in this field, including my @ITS_UCDavis colleague Dr. Caroline Rodier (available here in brief form, w/ links to full report: escholarship.org/uc/item/4vz524…) 2/
Apr 23, 2019 • 17 tweets • 4 min read
Lots of people commenting on recent @UChiEnergy study on costs of renewable energy requirements. @JesseJenkins and @drvox both make good, specific critiques, which I recommend. Since I've got time while my train is broken down in an almond orchard, I'll add my own. 1/ I think one effect the study seems to miss is that part of the point of RPS policies was to drive technological progress and cost reductions. It was known back in the mid-2000's that wind and solar were more expensive than fossil fuels. That's precisely why we needed an RPS. 2/
Sep 10, 2018 • 12 tweets • 3 min read
Jerry Brown dropped massive announcement to kick off GCAS: Not only will the state legally commit itself to carbon neutral electricity by 2045. It's going to do that for the WHOLE DANG ECONOMY.

gov.ca.gov/wp-content/upl…

Let that sink in for a moment. This is going to take some time to unpack, but I'll give a few initial thoughts.

First, how big is this. Massive. I struggle to think of a metaphor equal to the task without diving into war imagery, which just doesn't fit here.
Jul 11, 2018 • 25 tweets • 5 min read
Unpacking today's great news on California's GHG progress in a brief thread:

arb.ca.gov/cc/inventory/d… The headline you're probably hearing is accurate. CA has officially met its 2020 target early, returning GHGs to 1990 levels by 2016. This is legitimately cause for (brief) celebration. I'll pause a moment to let you bask in the warm glow. 2/