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Our Executive

The board formally delegates the day-to-day management of Horizon Power to the Chief Executive Officer and Executive management team.

Horizon Power is structured into six divisions, each with a focus on delivering aspects of its operations, customer services and ongoing business developments.

CEO Stephanie Unwin

As Chief Executive Officer of Horizon Power, Stephanie Unwin leads a 500 strong team of energy professionals to deliver power to some of Western Australia’s most remote and regional communities.

Under her leadership Horizon Power is transforming the energy landscape in an increasingly decentralised delivery model to more than 48,000 connections across 35 microgrids through 2.3 million square kilometres of rugged and remote territory.

Stephanie is passionate about inclusion and diversity to build a transparent environment with an engaged workforce.  Her ability to facilitate change on a foundation of safety is delivering Horizon Power’s vision to create customer choice and be a leader in microgrid technology.

Stephanie is a recognised energy industry leader with significant executive and board-level experience with Zenith Energy, Synergy and Verve Energy, following on from a career in corporate and resources law.  She is a Board Member of the Australian Renewable Energy Agency.

Stephanie brings a depth of experience in transformation and information technology, as well as a strong focus on regional communities, cultural awareness and safety to Horizon Power, fostered during her upbringing in Western Australia’s remote Pilbara region.

Stephanie joined Horizon Power in March 2019.

General Manager David Tovey

David Tovey is Horizon Power’s General Manager of Corporate Services, and Company Secretary.

As Company Secretary, David provides advice and administrative services to the Board. As General Manager of the Corporate Services division, David oversees Horizon Power’s legal and risk, communications, procurement, facilities management, health and safety, and human resources functions.

David has extensive experience in the electricity industry in a variety of strategic, business development, operational and corporate governance roles. He is a member of CPA Australia, the Australian Institute of Company Directors and an Associate of the Governance Institute of Australia.

General Manager Mike Houlahan

Mike Houlahan is Horizon Power’s General Manager of Commercial Services and Finance, and Chief Financial Officer.

Mike led the development of new business futures, focused not only on the traditional, centralised generation model, but the growing, highly distributed, stand-alone and remote community models. This is being achieved through the implementation of a new microgrid operating model, incorporating an award-winning digital transformation and revolution of the customer experience. 

The Commercial Services and Finance division is developing an enterprise value roadmap to ensure long-term financial sustainability, and prioritise the development of products and services that benefit both customers and the network.

As well as his nine years in the energy industry with Horizon Power, Mike has held senior consulting, finance and strategy roles across various industries including banking, civil construction and telecommunications, in New Zealand, Singapore, Hong Kong and the UK.

General Manager Darren Hill

Darren Hill is the General Manager of Horizon Power’s Generation and Retail division.

Under Darren’s leadership, the Generation and Retail division develops the products, pricing structures and contract strategies for all customers – from residential, to large and medium enterprise customers as well as independent power producers.

The division manages all facets of customer service, Horizon Power’s retail strategy and the delivery of major generation developments. The division is also responsible for sourcing contracts, which includes power purchase agreements, and gas, diesel and transport contracts.

With strategic leadership and management expertise in the utilities sector, Darren is experienced in managing relationships with stakeholders.

General Manager Tiri Sanderson

Tiri Sanderson is the General Manager of Horizon Power’s Operations division, responsible for the safe and reliable operation of all Horizon Power Systems.

Tiri brings a wealth of experience and expertise to the organisation, having previously worked in operations, safety and improvement roles across mining, transport and consumer goods sectors. She has led large safety critical teams across regional Western Australia in senior leadership roles with Rio Tinto Iron Ore and Aurizon.

General Manager Andrew Blaver

Andrew Blaver is the Acting General Manager of Horizon Power's Consumer Energy division.

The Consumer Energy division is developing a range of new technologies and business offerings that will accelerate access to renewable energy and support reliable, cost-effective electricity for all.

General Manager Laurie Curro  

Laurie Curro is Horizon Power’s General Manager of Power Systems, overseeing a broad range of engineering, asset management and regulatory functions.

Laurie has over 30 years’ experience working in the energy industry, with a particular focus on power transmission and distribution. He has worked in most areas of the electricity value chain with particular interest in design, planning, operations and fault management.

Laurie holds Engineering Executive status with Engineers Australia and is a graduate of the Australian Institute of Company Directors.