The energy giant reappointed the incumbent following a pitch involving several rival agencies.
Zibrant will manage Centrica’s UK venue-sourcing, with the client using the agency’s newly-developed technologies, including online booking platform Zapp.
Fay Sharpe, Zibrant’s managing director, said: "The Centrica account management and operations teams have worked hard to produce innovative and creative solutions for the client."
Allison Webb, Centrica’s procurement category manager, added: "We went out to tender with an open mind, conducted a thorough marketing analysis and solicited a request for proposal.
"Ultimately Zibrant was found to be the most fitting provider for Centrica and we are delighted with this decision."