Reliance Industries, controlled by Mukesh Ambani, India’s wealthiest man, is set to take a rival group run by his younger brother Anil to the Supreme Court in a gas dispute that promises to become a test case.

Reliance Industries is fighting a ruling last month from the Bombay High Court that it should supply gas to Anil’s Reliance Natural Resources at about half the price agreed with the government, in a wrangle linked to a succession battle between the brothers.