July 30 (Reuters) - TC Energy on Tuesday announced the sale of a minority stake in its Nova Gas Transmission System for C$1 billion ($722.13 million) to certain indigenous Canadian communities as part of a plan to reduce its debt and fund investments. ($1 = 1.3848 Canadian dollars) (Reporting by Tanay Dhumal, Seher Dareen and Arunima Kumar in Bengaluru; Editing by Shilpi Majumdar)