Clark Energy Center, New York Power Authority - Marcy, NY https://maps.app.goo.gl/hvQi4qzgSTbs84296
to another (HQT):
Hydro-Québec - Poste Châteauguay - Saint-Étienne-de-Beauharnois, QC https://maps.app.goo.gl/duDA5wbBPrgVBxc19
but, reporting of other attached lines stops there because the datasource doesn't include Canadian-only lines.
Live overview status here, but not for a specific power line: https://www.eia.gov/electricity/gridmonitor/dashboard/electr...