India, Oct. 27 -- A power grid is only as dependable as the communication running through it. Substations must talk to each other constantly, and when a fault appears, protection systems have to isolate it within moments so a local failure doesn't become a blackout. As more renewable energy joins the network, this equipment matters even more, and utilities increasingly prefer vendors with a long record in critical infrastructure.

The Nifty 50 was trading at 22,706.05, down 0.21%. Meanwhile, Sensex also fell 0.31% to 73,378.70 on Tuesday. Meanwhile, Shares of Valiant Communications were trading at Rs. 1,613.35, up 16.02 percent from previous close of Rs. 1,390.60. The stock opened at Rs. 1,424.70 and reached an intraday high of Rs. 1,560...