Indian Energy Exchange, the nation’s largest electricity trading platform and a stock that had 100% 'buy' recommendations till recently, just got two back-to-back ‘sell’ ratings.Spark Capital and Axis Capital downgraded the stock to ‘Sell’. The other 10 brokerages that track the company recommend ‘Buy’.That comes when IEX has surged more than 37% year-to-date, beating most power sector peers and benchmarks. The Sensex fell 1.7% and t...