Darren and Arryn at Kogan

Executive leadership team

Darren Busine 

darren busine

Chief Executive Officer

Darren Busine commenced as CS Energy's Chief Executive Officer on 1 July 2023. He has more than 30 years' experience in senior commercial and executive roles.

Prior to his appointment as CEO, Darren was CS Energy's Executive General Manager Energy Markets, Technology and Commercial where he was responsible for functions including trading and analytics, strategy and planning, information technology, commercial resources, procurement and purchasing.

Darren joined CS Energy in 2016 as Chief Financial Officer. In 2017 he was appointed as Executive General Manager Revenue Strategy and in September 2021 he was appointed to the Executive General Manager Energy Markets, Technology and Commercial role.

Prior to joining CS Energy, Darren was the Chief Financial Officer with a number of energy industry businesses including the two major Queensland Distribution entities Energex and Ergon Energy and also at energy retailer QEnergy.

Prior to joining the energy industry, Darren spent 10 years with Suncorp in senior finance roles.

Darren is currently a director on the Board of the Australian Energy Council.


Leigh Amos 

leigh amos

Executive General Manager Plant Operations
BEngTech, MBA

Leigh Amos joined CS Energy as Executive General Manager Plant Operations in 2019. In this role he manages the operational performance of CS Energy’s generation assets, as well as the environment, and health and safety functions.

Leigh has built an impressive track record as a collaborative and effective leader managing complex and geographically diverse operations in the energy industry both in Australia and overseas. 

He has a nuanced understanding of the challenges facing the energy industry and has a real passion for empowering people to build a constructive culture.

Prior to joining CS Energy, Leigh fulfilled a variety of roles at Western Australian energy company Synergy across their coal, gas and renewable assets. Before that, he worked for the NZX listed Contact Energy managing their gas-fired assets in Auckland, Hamilton and Napier, as well as the Oakey Power Station in southern Queensland.

Leigh began his career in the energy industry as an I&C Technician at Callide Power Station in 1997.


Cameron Collins 

Cameron Collins

Chief Financial Officer

Cameron Collins was appointed as Chief Financial Officer in April 2024 after acting in the role for 12 months. He leads CS Energy’s Finance & Corporate Services division, and is responsible for functions such as people and culture, finance, energy and financial risk and risk, compliance and assurance.

Prior to this, Cameron was CS Energy’s Head of Finance where he was responsible for financial reporting and management accounting, budgeting and forecasting, treasury, taxation, investment governance and finance shared services.

Cameron joined CS Energy in 2009, during which time he has developed a thorough knowledge of the energy sector and demonstrated strong commercial and financial acumen and leadership capability, which has resulted in Cameron also holding other senior leadership and executive leadership roles including Head of Risk and Compliance and Acting Chief Financial Officer.

Prior to joining CS Energy, Cameron held several senior finance roles working in industry across both business advisory and audit and assurance disciplines.


Barry Millar 

Barry Millar

Executive General Manager Asset Management
B. Eng (Hons) Mechanical Engineering

Barry Millar joined CS Energy in the September 2022. He leads our Asset Management division, which includes asset strategy, engineering, capital projects, unit overhauls and plant data analysis .

Barry join CS Energy from AGL, where he held numerous strategic leadership roles in asset management over the past decade, most recently across the entire generation, mining, and gas portfolio. Prior to this Barry had been working in engineering and asset management in the energy industry in the UK since the 1990s.

He brings significant expertise in maximising the performance of plant and engineering services. Barry is focused on a holistic approach to asset management, combining engineering, technology, analytics, process safety, governance and risk and compliance to deliver outcomes.

Barry has a track record of transforming culture through his approach to coaching and supporting people.


Emma Roberts 

emma roberts

Executive General Manager Customers and Growth
LLB (Hons), BAppSc (Ecology)

Emma Roberts leads CS Energy’s Customers and Growth division, spearheading the development of a new low-cost, decarbonised, and flexible energy portfolio for the business. The division includes business development, future energy asset design and project management, retail sales, commercial partnerships, customer products, corporate affairs, and policy and regulatory advocacy.

Her in-depth knowledge of the National Electricity Market, coupled with her commercial acumen and leadership skills, has seen Emma hold a variety of senior roles since joining CS Energy in 2012. These include Senior Legal Counsel, Acting Executive General Counsel and Company Secretary, and Head of Future Energy.

Emma has developed a strong reputation for leading cross-functional teams to deliver positive business outcomes. She led the establishment of CS Energy’s retail function and has driven CS Energy’s pivot towards a customer-focused culture as the business diversifies in response to the transformation of the energy system.

Emma holds degrees in law and applied science. Prior to joining CS Energy, she was a senior associate at McCullough Robertson Lawyers for eight years, working in the corporate and intellectual property teams.


 Andrew Varvari

Andrew Varvari

Executive General Manager Transformation
LLB, B-Bus, G Dip App Fin (Sec Inst), F Fin, Grad ICSA, GAICD

Andrew Varvari is responsible for the transformation, trading and analytics, digital and technology, resources and commercial, industry collaboration, people and culture, and company secretariat and legal functions. He has more than more than 18 years’ experience in senior executive roles in the energy, resources and utilities sectors.

Andrew joined CS Energy in 2012 and has led various teams and corporate divisions across the business, with a focus on safety, integrity, and people.

Andrew served as CS Energy's Acting Chief Executive Officer from March to June 2023. Prior to this he was CS Energy’s Chief Financial Officer, a role in which he led the finance; energy and financial risk; people and culture; corporate affairs; legal; risk, compliance and assurance; and Board secretariat functions. He is a director of CS Energy’s various subsidiaries.

Andrew developed his commercial experience through his involvement in some of the Queensland’s largest projects and commercial transactions. Prior to joining CS Energy, Andrew was a member of QGC’s Executive Leadership Team where he led BG Group plc’s legal function in Australia, and QGC’s Secretariat, Business Services and IT functions. Andrew played a key role in the development of the $20 billion Queensland Curtis LNG project, including the integration of the existing Queensland Gas Company and BG Australia businesses following the 2008 takeover of QGC by BG Group plc and the subsequent development of its upstream and midstream businesses.