I noticed that the nearest power plant nearby isn’t here. It’s really small, so I’m not surprised but I’m not sure how to flag the discrepancy and share details about the station.
If you leave a note anonymously on http://osm.org and then link it here in a reply. I would be happy to add it for you, link to the wikipedia/wikidata page for the power station if there is one. There is a lot that can be tagged if you look at the documentation try to include as much information as possible.
Go to openstreetmap.org, sign up for an account, login (top right) and then press the "Edit" button.
There will be offer of tutorial, I recommend going though it.
This in editing: select that you want to add point/area, create it and search for power plant in top left. Select it, add more detail if able and save the edit (save button in top right, then enter description of edit in sidebar on the left and press save button).
Edits go live immediately, but data consumers update with some delay depending on their setup (ranges from up to 60 second delay for ones using minutely updates to "no updates").
