Chair Barbara Chapman said he had led Genesis through an intensive period of change "and positioning it for the future as a more sustainable, inclusive and customer-focused business".
Hickman has been with Genesis for 25 years and joined the executive team in 2012.
In 2019, she took on a new portfolio as executive general manager retail operations.
Prior to moving into the retail business, Hickman led Genesis' generation, wholesale and fuels portfolio businesses as executive general manager.
In her current role, she is accountable for the Genesis retail brand.
In its latest first-half result, released in February, Genesis delivered ebitdaf of $210.3 million and a net profit of $84.7m, which was 63 per cent up on the same period last year.
The 2022 ebitdaf guidance range for the current year to June 30 has been updated to $430m to $440m, subject to hydrological conditions.
