The investigation will "dig as deep as humanly possible" into the astroturfing campaign, said Council President Jason Williams.
The council has asked Entergy to preserve evidence of its astroturfing campaign.
The company said it has ended its relationship with The Hawthorn Group. It hired Crowds on Demand, which hired the actors.
Dozens of people in orange shirts showed up at meetings to support Entergy's new power plant. But for many of them, it was just an acting gig. They were paid to show up and speak on the company's behalf. The Lens interviewed a few of them and reviewed messages outlining the astroturfing effort.