Greg Schivley

Hey #EnergySky! This summer we are organizing a 2-day energy data lab for early career researchers from August 11-12 at Georgia Tech. It will be a mix of tutorials, open lab time, and networking. Applications are due April 3 – for more info, see our blog post: bit.ly/catalyst-dat...

Best heat pumps lists are great, but it's also good to know what to avoid. Can't say I love my Bosch system and I know someone else with a newer model who thinks it's too loud. @kyrib.bsky.social you also have a Bosch, right?

This is why Emily, Josh, and so many others like us have been thinking and organizing for the necessary public ownership transitions that we _must_ put in place to succeed.

We can both make sure we see the end of fossil fuels and make sure the phase out builds more justice, not more catastrophe.

Thanks for validating. Other details I know are Qcell 595 panels and expected CF of 14%.

Apparently ME is ending community solar — I don’t blame them, retail credits for large ground-mounted is kinda crazy. Might be the last chance and it also qualifies for the ITC.

Can’t hurt to call it out 🤷‍♂️

It’s ground mounted, south facing, 35°, in Maine. I’m looking at 10-20kW (offset small commercial use). I bet it’s still cheaper than Maine retail power, but paying rooftop rates for part of a project like this rubs me the wrong way.

@commercialsolarguy.com am I right to think that $3500/kW for a share of a ~1MW community solar farm seems steep?

What’s a reasonable price per kW for building 1MW commercial (community solar) these days? And how much should a customer expect to pay for buying a fraction of the project?

#energysky

According to a new court filing, the Trump administration has a six-page list of banned words that Head Start locations are forbidden from using when describing their programs.
Among the censored words: "disability," "race," "women," "trauma," "Gulf of Mexico." Short thread with the full list. 🧵

ReEDS has tx line capacity in both direction. Many cap expansion models use a single value. Better to use the avg or max? Max makes sense if power flows continue in the same direction.

Any thoughts? @wilsonar.bsky.social @nworbmot.bsky.social @oetenergy.bsky.social @bistline.bsky.social
🔌💡

🧪Let’s set the record straight. AGAIN

Andrew Wakefield’s paper was RETRACTED by The Lancet in Feb 2010.

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

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.

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.

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 🥺

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.

Forty-year hydropower generation reanalysis for Conterminous United States - Scientific Data Scientific Data - Forty-year hydropower generation reanalysis for Conterminous United States

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!

If 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.

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. 🔌💡

#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 🤯

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

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.

Chasing fireflies with the kids was enough to get me sweating tonight. Then I realized the Porto/Al Ahly game was just up the road 🥵

Later today, 12pm ET