Greg Schivley
@gschivley.bsky.social
Energy systems data, code, hiking, bikes, and more. Building stuff in the ZERO Lab at Princeton.
My new favorite bathroom sign
October 17, 2025 at 1:16 PM
My new favorite bathroom sign
The #USRSE (research software engineering) conference wrapped up today. I was excited about 1) the number of undergrads attending, and 2) that there are already recent college grads working in the field. It's great to see the field expand beyond those of us with PhDs that stumbled into it.
October 8, 2025 at 7:28 PM
The #USRSE (research software engineering) conference wrapped up today. I was excited about 1) the number of undergrads attending, and 2) that there are already recent college grads working in the field. It's great to see the field expand beyond those of us with PhDs that stumbled into it.
Reposted by Greg Schivley
I visited the apartment building ICE raided on Tuesday today. Story to come, but you can walk right in. Half of the apartments have no doors on them. Children's stuff abandoned in some flats. *Citizen* residents told me they were arrested and held for hours in zipties. This is America
October 4, 2025 at 8:49 PM
I visited the apartment building ICE raided on Tuesday today. Story to come, but you can walk right in. Half of the apartments have no doors on them. Children's stuff abandoned in some flats. *Citizen* residents told me they were arrested and held for hours in zipties. This is America
Me, a rock climber: I have calluses on all my fingers.
Me, after getting a new set of GravelKing tires on my bike: Oww, my thumbs hurt 🥺
Me, after getting a new set of GravelKing tires on my bike: Oww, my thumbs hurt 🥺
October 4, 2025 at 8:48 PM
Me, a rock climber: I have calluses on all my fingers.
Me, after getting a new set of GravelKing tires on my bike: Oww, my thumbs hurt 🥺
Me, after getting a new set of GravelKing tires on my bike: Oww, my thumbs hurt 🥺
Reposted by Greg Schivley
statmodeling.stat.columbia.edu/2025/09/24/m...
"Levitt was a University of Chicago professor, he has (by academic standards) nearly infinite resources, he could study whatever he wants, and he’s going for . . . clicks?"
"Levitt was a University of Chicago professor, he has (by academic standards) nearly infinite resources, he could study whatever he wants, and he’s going for . . . clicks?"
More on the decline and fall of Steven Levitt | Statistical Modeling, Causal Inference, and Social Science
statmodeling.stat.columbia.edu
September 26, 2025 at 12:15 AM
statmodeling.stat.columbia.edu/2025/09/24/m...
"Levitt was a University of Chicago professor, he has (by academic standards) nearly infinite resources, he could study whatever he wants, and he’s going for . . . clicks?"
"Levitt was a University of Chicago professor, he has (by academic standards) nearly infinite resources, he could study whatever he wants, and he’s going for . . . clicks?"
Reposted by Greg Schivley
NEW TOOL: a one-stop, searchable home for 250+ state energy and climate policies, targets, and incentives. Perfect for planners, policy-makers, and analysts.
apps.epri.com/energy-polic...
apps.epri.com/energy-polic...
September 24, 2025 at 5:20 PM
NEW TOOL: a one-stop, searchable home for 250+ state energy and climate policies, targets, and incentives. Perfect for planners, policy-makers, and analysts.
apps.epri.com/energy-polic...
apps.epri.com/energy-polic...
Just found out that EIA downscales annual generation to monthly at most hydro plants using a sample of surveyed plants. ORNL has a paper where they reconstruct monthly generation from 1980-2019 at plants >10MW using local proxies. #EnergySky
@catalyst.coop
www.nature.com/articles/s41...
@catalyst.coop
www.nature.com/articles/s41...
Forty-year hydropower generation reanalysis for Conterminous United States - Scientific Data
Scientific Data - Forty-year hydropower generation reanalysis for Conterminous United States
www.nature.com
September 3, 2025 at 6:50 PM
Just found out that EIA downscales annual generation to monthly at most hydro plants using a sample of surveyed plants. ORNL has a paper where they reconstruct monthly generation from 1980-2019 at plants >10MW using local proxies. #EnergySky
@catalyst.coop
www.nature.com/articles/s41...
@catalyst.coop
www.nature.com/articles/s41...
Living the dream. All 6 of biked to the beach!
August 27, 2025 at 12:09 AM
Living the dream. All 6 of biked to the beach!
Reposted by Greg Schivley
Today on SHIFT KEY Summer School: how do electricity markets work? I give @robinsonmeyer.bsky.social a primer on marginal generators, bid curves, and capacity markets. Listen @heatmap.news or wherever you get your podcasts. 🔌💡
August 13, 2025 at 1:57 PM
Today on SHIFT KEY Summer School: how do electricity markets work? I give @robinsonmeyer.bsky.social a primer on marginal generators, bid curves, and capacity markets. Listen @heatmap.news or wherever you get your podcasts. 🔌💡
#EnergySky I noticed that Idaho Power lists ALL of their existing/proposed storage units as flow batteries (FLB) in EIA860. They also show max discharge rates as 4-10x the charge rate. Duration is 4 hours in all cases.
Anyone know if these are just LiB, or actually something different?
Anyone know if these are just LiB, or actually something different?
August 13, 2025 at 4:52 PM
#EnergySky I noticed that Idaho Power lists ALL of their existing/proposed storage units as flow batteries (FLB) in EIA860. They also show max discharge rates as 4-10x the charge rate. Duration is 4 hours in all cases.
Anyone know if these are just LiB, or actually something different?
Anyone know if these are just LiB, or actually something different?
With Copilot and Claude 4 it finally feels like I have a tool that can take instructions (or vague ideas) and implement them in my code. I *could* have written a decorator that fills function args using dict values in a class singleton, but I would have taken days. Just did it in an afternoon 🤯
July 31, 2025 at 8:08 PM
With Copilot and Claude 4 it finally feels like I have a tool that can take instructions (or vague ideas) and implement them in my code. I *could* have written a decorator that fills function args using dict values in a class singleton, but I would have taken days. Just did it in an afternoon 🤯
Reposted by Greg Schivley
Anyone have a good analysis of the GW of potential gas plants by COD in the US, based on known gas turbine supply deliveries? #energysky
July 31, 2025 at 12:33 AM
Anyone have a good analysis of the GW of potential gas plants by COD in the US, based on known gas turbine supply deliveries? #energysky
I'm digging into the EIA 860 Energy Storage file, where there are a bunch of columns that describe its application (arbitrage, frequency reg, backup power, etc). Values are "Y" or "PR". But PR isn't described anywhere!
After some digging, I'm pretty sure that PR is "primary".
You're welcome.
After some digging, I'm pretty sure that PR is "primary".
You're welcome.
July 23, 2025 at 7:23 PM
I'm digging into the EIA 860 Energy Storage file, where there are a bunch of columns that describe its application (arbitrage, frequency reg, backup power, etc). Values are "Y" or "PR". But PR isn't described anywhere!
After some digging, I'm pretty sure that PR is "primary".
You're welcome.
After some digging, I'm pretty sure that PR is "primary".
You're welcome.
It’s helpful to remember that not everything in the world is turning to shit. Last week my family went to Banff, which was absolutely incredible. Thanks Canada, for working to keep it wild.
July 3, 2025 at 8:10 PM
It’s helpful to remember that not everything in the world is turning to shit. Last week my family went to Banff, which was absolutely incredible. Thanks Canada, for working to keep it wild.
Reposted by Greg Schivley
Later today, 12pm ET
Launching tomorrow: Valerie Karplus and I have a piece in a @cepr.org collection “The Economic Consequences of The Second Trump Administration: A Preliminary Assessment”. Register for a webinar to hear the organizers speak on a panel about the book: cepr.org/events/onlin...
Online Launch - The Economic Consequences of The Second Trump Administration: A Preliminary Assessment
Search the site
cepr.org
June 18, 2025 at 1:10 PM
Later today, 12pm ET
Reposted by Greg Schivley
ICE just arrested Brad Lander, the NYC Comptroller and one of the leading candidates for Mayor, without grounds.
He was conducting routine immigration court work, escorting individuals from hearings.
He asked ICE for their warrant - well within his legal rights.
This is political intimidation.
He was conducting routine immigration court work, escorting individuals from hearings.
He asked ICE for their warrant - well within his legal rights.
This is political intimidation.
Whoa! NYC mayoral candidate and current city Comptroller Brad Lander seemingly arrested at the NYC immigration court while attending to escort someone attending their hearing.
Lander just got detained by federal agents as he tried to escort a man out of the courtroom. Lander was taken in an elevator with masked agents, along with one member of his NYPD security detail.
June 17, 2025 at 4:59 PM
ICE just arrested Brad Lander, the NYC Comptroller and one of the leading candidates for Mayor, without grounds.
He was conducting routine immigration court work, escorting individuals from hearings.
He asked ICE for their warrant - well within his legal rights.
This is political intimidation.
He was conducting routine immigration court work, escorting individuals from hearings.
He asked ICE for their warrant - well within his legal rights.
This is political intimidation.
Reposted by Greg Schivley
And again, the measles vaccine is estimated to have saved more than 90 million lives globally in the last 50 years.
ourworldindata.org/measles-vacc...
ourworldindata.org/measles-vacc...
June 16, 2025 at 2:05 PM
And again, the measles vaccine is estimated to have saved more than 90 million lives globally in the last 50 years.
ourworldindata.org/measles-vacc...
ourworldindata.org/measles-vacc...
Reposted by Greg Schivley
Not true.
I see you're a luxury watch dealer. I'm also interested in watches. Let me show you how free and easy migration has allowed you to earn a living. 🧵
I see you're a luxury watch dealer. I'm also interested in watches. Let me show you how free and easy migration has allowed you to earn a living. 🧵
June 10, 2025 at 11:59 PM
Not true.
I see you're a luxury watch dealer. I'm also interested in watches. Let me show you how free and easy migration has allowed you to earn a living. 🧵
I see you're a luxury watch dealer. I'm also interested in watches. Let me show you how free and easy migration has allowed you to earn a living. 🧵
Reposted by Greg Schivley
You and your children will breathe more air pollution because of this action. People will have more asthma attacks. People will have more heart attacks. All while climate impacts accelerate.
The Trump administration plans to get rid of all limits on climate-warming pollution from the nation's fossil fuel power plants. Fossil fuel interests hailed the proposal, which likely faces legal challenges from environmental groups.
Trump's EPA plans to repeal climate pollution limits on fossil fuel power plants
The Trump administration plans to get rid of all limits on climate-warming pollution from the nation's fossil fuel power plants. Fossil fuel interests hailed the proposal, which likely faces legal challenges from environmental groups.
n.pr
June 12, 2025 at 1:36 AM
You and your children will breathe more air pollution because of this action. People will have more asthma attacks. People will have more heart attacks. All while climate impacts accelerate.
Reposted by Greg Schivley
The EPA's reasoning to justify repealing greenhouse gas regulations for power plants is so tortured, I feel like my brain has been waterboarded after reading it 🤯
The justification goes like this...🧵(1/8)
The justification goes like this...🧵(1/8)
www.epa.gov
June 11, 2025 at 7:33 PM
The EPA's reasoning to justify repealing greenhouse gas regulations for power plants is so tortured, I feel like my brain has been waterboarded after reading it 🤯
The justification goes like this...🧵(1/8)
The justification goes like this...🧵(1/8)
Reposted by Greg Schivley
🚨 NEW RESEARCH: The energy transition is more disruptive—and could move much faster—than most people think.
It’s not just about swapping old tech for new.
Shift to clean energy is a complex web of feedback loops, tipping points & surprises.
Our new 📖 👇
www.scurveeconomics.org/publications...
🧵
It’s not just about swapping old tech for new.
Shift to clean energy is a complex web of feedback loops, tipping points & surprises.
Our new 📖 👇
www.scurveeconomics.org/publications...
🧵
June 5, 2025 at 2:32 PM
🚨 NEW RESEARCH: The energy transition is more disruptive—and could move much faster—than most people think.
It’s not just about swapping old tech for new.
Shift to clean energy is a complex web of feedback loops, tipping points & surprises.
Our new 📖 👇
www.scurveeconomics.org/publications...
🧵
It’s not just about swapping old tech for new.
Shift to clean energy is a complex web of feedback loops, tipping points & surprises.
Our new 📖 👇
www.scurveeconomics.org/publications...
🧵
Reposted by Greg Schivley
Cuts have consequences, illustrated. As seen on TV 📺
June 3, 2025 at 12:45 AM
Cuts have consequences, illustrated. As seen on TV 📺
Reposted by Greg Schivley
It has long been clear DOGE's numbers are made up, but here in response to my comment they're giving up the game: They're not doing anything like cost-benefit analysis. "Savings" is a transfer from U.S. households to businesses.
It's grift all the way down.
www.nytimes.com/2025/05/30/u...
It's grift all the way down.
www.nytimes.com/2025/05/30/u...
May 30, 2025 at 1:41 PM
It has long been clear DOGE's numbers are made up, but here in response to my comment they're giving up the game: They're not doing anything like cost-benefit analysis. "Savings" is a transfer from U.S. households to businesses.
It's grift all the way down.
www.nytimes.com/2025/05/30/u...
It's grift all the way down.
www.nytimes.com/2025/05/30/u...
Thanks to the incredible folks at EIA who responded to many emails as I tried to understand the data in NEMS.
Long before EIA had an open NEMS GitHub repo, I started using a 2019 AEO report on existing generator O&M costs. It splits plants into a few cost bins by size. Turns out EIA doesn't use those values! In an addendum they say plants are split into further subgroups. 1/n
www.eia.gov/analysis/stu...
www.eia.gov/analysis/stu...
May 28, 2025 at 1:46 PM
Thanks to the incredible folks at EIA who responded to many emails as I tried to understand the data in NEMS.