"Barbara represents the next generation of leadership required in the energy sector and has the skills and experience to provide the step-change required at this point in the company's transformation," Shipley said in a statement.
"Barbara brings a wide range of experience around product and market innovation and is widely recognised for her strong leadership style, her commercial credentials and her commitment to diversity."
Under Shipley's watch, Genesis shares have climbed to $2.515 from the $1.55 initial public offering price in April 2014, a 62 per cent increase and just lagging behind a 73 per cent gain on the S&P/NZX 50 index over the same period.
Shipley said highlights of her tenure included the acquisition of the Tekapo hydro assets, a better relationship with iwi, and the transition from an SOE into a partially privatised and listed company.
"Having also managed the transition between CEOs and having oversight of two recent important M&A transactions in 2016 and 2017, I feel I am leaving the business strongly positioned for future success," she said.
"I am also confident the board and management are well positioned to tackle market challenges going forward."