@gschivley.bsky.social
Energy systems data, code, hiking, bikes, and more. Building stuff in the ZERO Lab at Princeton.
A bathroom gender sign with a mermaid on one side and a pirate on the other. Underneath it says “whatever, just wash your hands”
My new favorite bathroom sign
17.10.2025 13:16 — 👍 0 🔁 0 💬 0 📌 0The #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.
08.10.2025 19:28 — 👍 1 🔁 0 💬 0 📌 0
X1 TLR here, not that I know the difference. More that I needed something wider (40mm) and with some tread for rides on rail trails with my daughter on the back.
05.10.2025 00:27 — 👍 1 🔁 0 💬 0 📌 0I 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
04.10.2025 20:49 — 👍 17678 🔁 7428 💬 464 📌 307Me, 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 🥺
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?"
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...
Paper figure showing that EIA's estimate of monthly generation at smaller hydro plants in the Mountain region can be wildly over-smoothed compared to a more accurate estimate. The EIA estimates are strongly influenced by the largest dams (i.e. Glen Canyon and Hoover).
Apparently EIA's method results in an over-smoothed distribution of energy across the year, especially for smaller dams. Figure from an earlier paper by the same authors showing how Hoover and Glen Canyon profiles are applied to other dams in the region.
www.nature.com/articles/s41...
Using dam release or streamflow is more accurate than surveyed plants. They provide generation estimates using both historical capacity (where plant cap has changed over time) and *current* capacity, which is useful for power system models representing today's capacity in historical weather years.
03.09.2025 18:50 — 👍 0 🔁 0 💬 1 📌 0
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...
Living the dream. All 6 of biked to the beach!
27.08.2025 00:09 — 👍 5 🔁 0 💬 0 📌 0If they're actually LIB, any reason to believe that charge rates are much lower than discharge rates? I wouldn't expect them to be but suppose they could be setting operational limits.
14.08.2025 18:03 — 👍 0 🔁 0 💬 1 📌 0
Shift Key Summer School podcast episode: how do power markets work?
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. 🔌💡
13.08.2025 13:57 — 👍 20 🔁 5 💬 0 📌 1#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?
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 🤯
31.07.2025 20:08 — 👍 1 🔁 0 💬 0 📌 0Anyone have a good analysis of the GW of potential gas plants by COD in the US, based on known gas turbine supply deliveries? #energysky
31.07.2025 00:33 — 👍 1 🔁 1 💬 0 📌 0
Questions 40a and 40b from EIA-860 Schedule 3, Part B. They ask what the primary and secondary application(s) are of the energy storage device.
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.
Water cascades down a hill through trees, with a mountain in the background. Taken in Canmore.
A Canadian flag waves in front of the sunset as seen from Sulphur Mountain.
A black bear grazing in Banff.
A panoramic view of Lake Minnewanka and the surrounding mountains.
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.
03.07.2025 20:10 — 👍 2 🔁 0 💬 1 📌 0Chasing fireflies with the kids was enough to get me sweating tonight. Then I realized the Porto/Al Ahly game was just up the road 🥵
24.06.2025 03:42 — 👍 1 🔁 0 💬 0 📌 0Later today, 12pm ET
18.06.2025 13:10 — 👍 7 🔁 2 💬 0 📌 075kWh also makes the fuel over $12/gal at residential rates. Not including whatever it costs to buy the unit.
18.06.2025 14:18 — 👍 0 🔁 0 💬 0 📌 0ICE 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.
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...
Corey Wiley on Twitter writes: "You don’t get it. Foundational immigration law is morally just and has been established over millennia. Disrespecting these rules and ideals is very offensive to folks who highly value civilized society"
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. 🧵
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.
12.06.2025 01:36 — 👍 690 🔁 315 💬 12 📌 7The 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)
Oh god, I hadn’t thought of klout in years.
10.06.2025 01:50 — 👍 2 🔁 0 💬 0 📌 0
🚨 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...
🧵
Cuts have consequences, illustrated. As seen on TV 📺
03.06.2025 00:45 — 👍 23497 🔁 9461 💬 836 📌 1326
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...
