PyPSA/pypsa-usa

Difference in county level resolution from ReEDS

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#654 opened on Aug 16, 2025

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Description

I had a user reach out with a question that @ktehranchi is probably better suited to answer! Please find below the question.

While comparing data, I noticed that most states have more counties listed in ReEDS than in PyPSA. In the PyPSA config file, the simulations runs smoothly when I set clusters equal to the number of ReEDS counties, but only for Arizona, California, and Wyoming. For instance, in California, setting clusters = 58 matches the 58 counties in ReEDS and works perfectly. However, in Montana, the number of clusters needs to be reduced from 45 (ReEDS) to 38 for the simulation to run successfully. Any thoughts?

Contributor guide

Research direction
Investigate the county filtering logic in PyPSA USA and compare with ReEDS county list. Check for missing counties or clustering constraints in specific states.
Tech stack
python
Domain
backendapi
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50