Longford Gas Plants will have a new manager from the beginning of next month.
Esso confirmed the current manager, David Anderson, would begin an extended period of long service leave, effective November 1.
His replacement will be Kartik Garg, who will be returning to Gippsland operations, where he began his career.
In the past decade Mr Garg has managed ExxonMobil assets in Russia and North America.
Mr Anderson had been Longford plants manager for almost four years.
He joined Esso Australia in 1981, beginning as an apprentice at the Longford plants.
Following several maintenance and management assignments at Longford, Mr Anderson was appointed Long Island Point plant manager in 2009, and in 2012 was appointed manager of the Adriatic LNG regasification plant in Italy.
He returned to Longford in February 2016 when he became Longford plants manager.
During his leadership, Mr Anderson has overseen the successful completion of major projects including the $1 billion Longford Gas Conditioning Plant, the $400 million Esso pipeline replacement project and the introduction of a new apprenticeship program, which, an Esso spokesperson said, had delivered highly skilled jobs and business opportunities locally.
He has been an active and engaged member of the community and as a Committee for Wellington member, has been an advocate for increased opportunities in the region.
An Esso spokesperson said Mr Garg looked forward to building on Mr Anderson's success at Esso's Longford plants - one of the state's most important industrial facilities.
The appointment comes soon after Esso announced it was putting all its Gippsland Basin assets on the market.
The sites up for sale include offshore oil and gas platforms, the Longford Gas Plants and Long Island Point facilities.
It is understood ExxonMobil will maintain its interests in the huge Gorgon gas project in Western Australia, and its interests in Papua New Guinea.