Zen Energy has appointed a new chair, after economist and climate expert Ross Garnaut officially resigned from the role in February.

Garnaut was filling in after Raymond Spencer resigned in August last year, and the company reported his exit in a corporate filing on April 29, The Australian reports.

Zen Energy chief Anthony Garnaut declined to comment on the change, saying the renewable energy generator and retailer may have an update in a few weeks.

The recently-appointed new chair is Mark Butcher, a former Ernst & Young managing partner and who counts five other current chair positions on his LinkedIn, including that of waste company Bingo Industries.

Other newcomers to the board include Pacific Blue chief Domenico Capomolla and Michael Larkin, who has a long track record as a corporate finance boss, following the departure of directors Raymond Spencer and Michael Lane, The Australian reports.