One New Energy

Our Team

The people behind ONE.


Rob Rohrlach

B.Sc., B.E. (Hons.), Grad. Cert. Mrktg., FAIE

Rob is the founder and Managing Director of One New Energy and brings over 30 years of industry expertise in all aspects of energy generation from renewable energy, evolving technologies, tariffs, wholesale electricity markets, demand side management and commercial and industrial applications.

He currently supports the back-end delivery of all of our projects and campaigns across Solar PPA’s, decarbonisation, ESA’s and microgrid solutions.


Jack Spencer Cotton

Project Manager

Jack is our Project Manager for all Solar PPA and battery installs, being the point of contact between our contracting partners, suppliers and clients. He has been involved in the field of engineering for over 20 years and has held a range of senior engineering roles in international manufacturing companies, as well as established his own business in electronics engineering and consulting.

Jack is experienced in automation engineering, project planning, and team management in large scale projects. He has previously held senior engineering positions at ERG Group Ltd, Sanmina-SCI Corporation, and SRX Global, and is passionate about applying his knowledge to renewable projects and innovation.


Carolina Goulart

Renewable Energy Engineer

Carolina is our Renewable Energy Engineer. She is responsible for solar predesign, energy rate calculations, proposal elaboration, and project follow-up.

Carolina holds a bachelor’s degree in Renewable Energy Engineering with honours and a Diploma in Project Management. She has experience in topics ranging from electric vehicles, charging, renewable energy, market analysis, and project management in Brazil, Austria, and Australia.

Carolina is a committee member of WIE – Women in Energy, a member of the AIE – Australian Institute of Energy, and she is also accredited by the Institution of Engineers Australia. She is deeply passionate about renewable energy and applies her expertise in her current role at One New Energy.


Rosie Payne

Decarbonisation Consultant

Rosie is responsible for supporting clients on their decarbonisation journey, providing end-to-end solutions to measure, reduce and report their carbon emissions.

Rosie holds a Graduate Certificate in Energy and Carbon Studies, and a Bachelor of Science – Double Major in Extractive Metallurgy and Biological Science, First Class Honours. She has skills in renewable energy system design, carbon accounting, techno-economic analysis, greenhouse gas reporting, developing Net Zero strategies, life cycle analysis (LCA) and project management.

Transferring experience developed working as a process engineer, she loves data analysis, interpretation and partnering with companies to develop solutions to reduce their environmental impact.