Mercury NZ Names Tomas Toomata Chief Generation Officer and Duane Makin Inaugural Chief Technology Officer

Shwetambri Chauhan

12 November 2026 10:15 AM AEDT

Mercury NZ Names Tomas Toomata Chief Generation Officer and Duane Makin Inaugural Chief Technology Officer

Image Source: Krish Capital Pty Ltd

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Mercury NZ Limited (ASX:MCY) has announced two new executive appointments and two title changes to its Executive Leadership Team, with Tomas Toomata appointed Chief Generation Officer effective 5 December 2026, and Duane Makin appointed to the newly created role of Chief Technology Officer effective 8 March 2027.

Key Points

Tomas Toomata, currently General Manager Health, Safety and Wellbeing, appointed Chief Generation Officer effective 5 December 2026
Duane Makin, currently General Manager Digital, Data and Technology at Orion Group, appointed to the new role of Chief Technology Officer effective 8 March 2027
Tim Thompson's title changes from Executive General Manager Wholesale to Chief Commercial Officer, effective 12 November 2026
Matt Tolcher's title changes from Executive General Manager Generation Development to Chief Generation Development Officer, effective 12 November 2026

Appointment of Tomas Toomata as Chief Generation Officer

Tomas Toomata has been appointed Chief Generation Officer, effective 5 December 2026. Mr Toomata joined Mercury in 2023 and currently serves as General Manager Health, Safety and Wellbeing. He has also previously served as Acting Chief Operating Officer – Generation. Prior to joining Mercury, he spent more than a decade in senior operational and leadership roles with Rio Tinto in Australia. The filing noted that outgoing Chief Operating Officer – Generation Kevin Taylor will retire in December, with Chief Executive Stew Hamilton acknowledging his contribution to the company.

Creation of Chief Technology Officer Role and Appointment of Duane Makin

Duane Makin has been appointed to the newly created role of Chief Technology Officer, effective 8 March 2027. Mr Makin joins Mercury from Orion Group, where he holds the position of General Manager Digital, Data and Technology. He has experience across the energy, healthcare and technology sectors, including senior technology leadership roles at ProCare Network, Atlantis Healthcare, and Vector. According to the filing, the Chief Technology Officer is described as a new and dedicated function for Mercury, reflecting the growing importance of technology in the company's operations.

Executive Title Changes for Tim Thompson and Matt Tolcher

Two existing members of Mercury's Executive Leadership Team received updated titles, effective 12 November 2026. Tim Thompson's title changed from Executive General Manager Wholesale to Chief Commercial Officer. The filing states he is responsible for Mercury's overall electricity portfolio, including wholesale market activities and sales to large commercial and industrial customers. Matt Tolcher's title changed from Executive General Manager Generation Development to Chief Generation Development Officer. He leads Mercury's generation development programme and is responsible for planning, developing and delivering new renewable generation projects.

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