Hi, I recently found out that current tagging for substations (power or pipelines) with substation=* key actually merge two distinct concepts. It deals with hierarchy levels and specific network functions a substation can host. It's hardly possible to document the substation=* key properly with the values voted in the last pipeline extension proposal. Main issue is a "compression substation" can also be a transmission or distribution substation and it hasn't been solved during the review process.
I wrote a new proposal to move the less used values of substation=* in more detailed and dedicated functions subkeys. It also adds substation=generation (formerly substation=transmission) and substation=delivery which are missing currently. https://wiki.openstreetmap.org/wiki/Proposed_features/Substation_functions This not-so-big change on < 2000 existing objects (out of +300k power substations and 7k pipeline substations) would enable OSM to have a better matching with IEC definitions and a more usable tagging. We will be able to tag more objects with substation tagging (delivery substation mainly) than before. Most of function subkeys has defaults that allow us to add them on specific situations if required only. I'll add more example before vote start (surely next Febuary or March depending on how RFC goes) All the best François
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