The special resolution was approved by the shareholders at the company's 21st annual general meeting yesterday.
In a BSE filing, the company said the proposal was approved by the shareholders as 95.94 votes were polled in favour.
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The shareholders also approved a special resolution for reappointment of G M Rao as Executive Chairman of the company.
GMR Group is a leading global infrastructure conglomerate with interest in various sectors including airport, energy and transportation.
Of the 15 power projects with the group, 10 are in operation and five are under development.