** Indian Energy Exchange IIAN.NS shares jump nearly 4% to 154.45 rupees - its highest level since July 24, 2025
** Stock surged 11% on Tuesday after electricity tribunal's scrutiny of market coupling rules seen as favourable for IIAN
** Last year, the electricity regulator moved to implement market coupling from January; IIAN slumped 30% next day
** Market coupling would create uniform electricity pricing across platforms, threatening IIAN's market dominance
** "We reckon coupling is not likely before Dec'27 in light of the challenges to its implementation," JM Financial says in a note
** JM Financial says given IEX's technological prowess and organisational capabilities, market share may taper to 60% in FY30E from 75% in FY28E if market coupling implemented
(Reporting by Brijesh Patel in Bengaluru)
((Brijesh.Patel1@thomsonreuters.com; Ph no. +91 9590227221;))