Shares of utility giant AES Corp (NYSE: AES) jumped as much as 11.5% in trading Thursday after it was revealed that activist investor ValueAct Capital Management's founder Jeffrey Ubben has been given a board seat and will push for more renewable energy. At 11:55 a.m. EST, shares were still trading 9.1% higher on the day. Ubben and ValueAct are pushing for AES to accelerate selling coal assets and reinvesting the money into renewable energy assets that have attractive investment profiles.