New Delhi, May 3 -- India has stepped up the security of its national power grid as heightened tensions with Pakistan revive memories of cyberattacks in recent years, three people aware of the development said.

The power ministry has tightened security protocols at the load despatch centres which manage the demand and supply of power. The goal is to repel potential cyber and physical attacks that could bring down the grid, a calamity for any transmission utility.

"The National Load Despatch Centre (NLDC) and other regional and state load despatch centres are highly secure and safe. However, the security of these load despatch centres is usually enhanced in the light of the national security situation," one of the three people said on th...