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Re:NetworkX – Network Analysis in Python by maliker on Saturday December 09, 2023 @06:49AM (#38581125)
That data is privately held by utilities, and the high voltage transmission infrastructure is highly confidential (CEII/NERC CIP). If you just need sample data, I'd recommend checking out the test data provided with power flow simulators like OpenDSS for distribution systems [1] or MATPOWER for generation + transmission [2]. The IEEE test systems are what are used in research, they have the component specs you're looking for, and are provided with those tools.

[1] https://sourceforge.net/projects/electricdss/ [2] https://matpower.org

Re:NetworkX – Network Analysis in Python by rwlincoln on Saturday December 09, 2023 @09:20AM (#38582110)
MATPOWER and OpenDSS test cases are also available in CSV format:

https://github.com/casecsv

https://github.com/cktcsv

Re:NetworkX – Network Analysis in Python by ok_dad on Saturday December 09, 2023 @02:04PM (#38584728)
Thanks to you and the next commenter up, these synthetic data sets are perfect for my current use case.