Madras was selected by British as its HQ owing to its geographical location with sea port. when linguistic based states were formed all were provided the same rights and law enforcement there is no favour for Tamilnadu.
If TN tommorow tells that the electricity produced by NLC is orginates from TN and others have no right over it.
Cauvery river originates from Karnataka and it flows thru Tamilnadu to reach sea. The river on its own didnt define it belongs to Kannadiga or Tamils.
please check with your brothers in Bangalore are they ready to cut down the electric cables which carry electricity from NLC. By your definition it should be Tamil Electricity and not be used in Kannada soil.
Madras is a metropolitan of modern days with no riot history. Even during hindi agitation no hindi speaking people were attacked.