Who We Are


Led by our founders Rollie Armstrong and Steffen Kammerer, we are an energetic and committed team of professionals, sharing our knowledge and experience to offer tailored energy concepts and solutions to our clients.



Rollie Armstrong

Managing Director
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As one of our Managing Directors, Rollie is focused on developing and implementing growth opportunities in the rapidly evolving market of renewable energies.

Prior to founding CRONIMET Power Solutions, Rollie co-founded and served as a director of SOLEA Capital GmbH, an internationally active PV development, investment and transaction structuring company. Under his leadership SOLEA successfully developed, built, operated and transferred utility scale PV projects in Italy, Germany, Romania and South Africa.
As responsible manager of a Munich based private equity group, Rollie profitably managed investments in the renewable energy sector. Further, Rollie spent six years with Ernst & Young Germany as a Corporate Finance and M&A Manager.
Rollie earned an MBA in Corporate Finance from Northeastern University in Boston and holds an undergraduate degree (B.Sc.) in Financial Services from UNLV.

Steffen Kammerer

Managing Director
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Besides his general management focus, our Managing Director Steffen is responsible for transaction- and project management, project financing and structuring of energy projects worldwide.
The business lawyer with degrees from the HFWU Nürtingen and the University of Economics Bratislava started his career at the international consulting company Ernst & Young in the area of mergers & acquisitions with a specialization in financial and advisory services to banks.
For an international investment company Steffen further actively led a considerable number of transactions and financing deals in the field of renewable energies.
In his previous role as Co-Founder and Director of SOLEA Capital GmbH, Steffen successfully managed the international expansion of the SOLEA group into Africa and Australia.

Sabrina Steinhauser

General Manager
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Sabrina heads our corporate team at CRONIMET Power Solutions. Committed to ensure a steady organizational development, Sabrina manages CRONIMET Power Solutions’ international subsidiaries and teams as well as the coordination of international projects.

She therefore directs the company group’s operations on a daily basis, including overseeing strategic execution in critical areas such as marketing, workforce development, project management, accounting, finance, and business administration. As a member of the board, Sabrina is involved in forward-thinking business stewardship and roadmaps.

Sabrina earned a M.A. in International Business with focus in Marketing from the University of Applied Science in Kufstein, Austria and holds a Bachelor’s degree in Economical Geography from the Ludwig-Maximilians-University in Munich.

A team of experts crafting efficient solutions


Nkosi Nkube

Executive Director CRONIMET Power Solutions SA
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Nkosi serves as CRONIMET Power Solutions South Africa’s Executive Director. He gathered extensive experience in the sourcing and implementation of financial transactions while working for financial institutions and specialist advisory boutiques including Old Mutual Specialised Finance, Nedbank and Basis Points Capital. Prior to his directorship at CRONIMET, Nkosi was a co-Director at SOLEA Renewables (Pty) Ltd (SA), a subsidiary of SOLEA Capital. Nkosi has gained years on domestic development and project execution experience in the renewable energy sector and continues to drive new project development opportunities for CRONIMET..

As Executive Director of CRONIMET’s South African Team, Nkosi is responsible for the organization of the corporate management, project coordination as well as financing in our South African subsidiary.

Alex Vassev

Executive Managing Director, Head of SADC
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Alex is in charge of our team of professionals in the SADC region and further heads our Legal Department in his capacity as an English and South African-qualified lawyer.
Alex previously founded Vassev Attorneys, a boutique law firm concentrating on Private Equity, Mining and Renewables and further practiced as an M&A lawyer at White & Case LLP.

Luc Tanoh

Head of West Africa
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Bringing over 30 years of experience in the Telecom, IT, Power Utility and Engineering industries throughout Africa, US and Europe to CRONIMET, Luc is a highly regarded Senior Executive, GSM and Energy specialist, combining significant board-level experience with in the field regional and continental leadership roles .
As Head of West Africa, Luc is responsible for business and project development throughout West Africa and the Francophone regions of Africa. He holds a Master’s Degree of Sciences in Electrical Engineering from the Swiss Federal Institute of Technology and a Master’s Degree of Sciences in Industrial Engineering and Operations Research from the University of Berkeley in California.


Dr. Georg Wirth

Technical Director
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As head of our technical department, Georg is responsible for the coordination of the technical feasibility studies, engineering analyses and procurement as well as for the development of hybrid PV, Diesel and energy storage system designs. Prior to joining CRONIMET, Georg led the photovoltaic grid integration team at the University of Applied Sciences Munich’s solar energy lab since 2010. During his four year stint, Georg managed a number of complex grid stability research projects outsourced to his lab by companies such as E.ON, General Electric, Siemens, and research institutions including the Technical University of Munich, DLR, and the Fraunhofer Institute.

Georg’s educational background started with a training at Siemens across the electrical engineering division. Georg achieved his Ph.D. Degree from the Carl von Ossietzky University at Oldenburg on modelling the meteorological effects of grid distribution physics under high photovoltaic penetration scenarios.

Lauren Sheldon

Legal Counsel
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As a member of CRONIMET’s legal team, Lauren is responsible for the management of all legal, compliance and permitting aspects of the Projects.  She holds her Bachelor of Law (LLB) as well as Master’s in Law (LLM) degrees from the University of the Western Cape, Cape Town.  During her LLM degree, Lauren focused on Corporate Governance and International Trade Law. After completing her academic training, Lauren secured a position for her practical training at a leading South African law firm where she was deployed to the Commercial, Banking & Finance, as well as Labour departments.  Before joining CRONIMET, Lauren worked for wealth management department of a multi-disciplinary advisory company, where her duties involved various internal as well as client-related commercial legal work.

Jaque Paul Fouché

Technical Manager
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Jaque Fouché is a Technical Manager at CRONIMET.  He earned his National Diploma in Mechanical Engineering at the Central University of Technology, Free State, after he started his career off in the Minerals and Mining sector. Since then he focussed his career on the Renewable Energy sector during the round II REIPP Programme in 2013.  He has also managed and completed grid tied and hybrid systems in excess of 10MW. As Technical Manager, Jaque is responsible for the electrical and mechanical implementation of off-grid PV systems, PV hybrid systems and PV grid tied systems consisting of rooftop and ground mount structures.  He is specialized in the performance-based implementation and execution of acquired projects until successful completion and handover to the end client.

Niel Lambrechts

Business Development Manager: SADC
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As a Business Development Manager for SADC region at CRONIMET Mining Power Solutions Niel is responsible to establish new relationships and expand CRONIMET’s development and investment portfolio.  Niel has a background in Mechanical Engineering (Mechatronics) but moved into the renewables industry after finishing university.  He spent the early parts of his career travelling throughout sub Saharan Africa providing technical services, product training and then sales support for well-known German renewable energy providers.  He holds a Diploma in Management Development from the University of Stellenbosch Business School and Mechanical Engineering (Mechatronics) from Cape Peninsula University of Technology.

Lonwabo Ntshiba

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As Junior Draftsman at CRONIMET Mining Power Solutions SA (Pty) Ltd Lonwabo supports our technical team and assists in O&M services, yield assessments and the drawing of PV plant layouts. He holds a national diploma in Mechanical Engineering from the Cape Peninsula University of Technology and started his BTech in Mechanical Engineering at the University of South Africa. With previous trainings in Engineering at the Two Rivers Platinum Mine and the Grinaker-Ita Mining, Lonwabo has built his background in the renewable engineering and mining industry.

Thabiso Innocent Makoloi

O&M Assistant
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Managing the power hybrid generation system, Thabiso supports our engineering team on site. He configures an programs the plant controllers and power factor correction equipment. He further manages and maintains the measurement data as well as the measurement equipment.

Shingirai Matunhira

Hybrid system operator
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Shingirai manages the solar hybrid plant at Thabazimbi and ensures the reliable delivery of electricity to the mine. He takes care of the power grid and constantly communicates with our customer as well as with the utility provider. Supporting our engineering team, he evaluates the data of the power systems for operational and consulting purposes. Shingirai holds a Diploma in Mechatronics, Robotics and Automation Engineering from the University of South Africa.


Chevon Koopman

Commercial Assistant
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As Commercial Assistant Chevon performs all administrative and accounting duties for our Namibian subsidiary and is essential for keeping the day to day business going forward and as planned. She further supports the project team in controlling.
Chevon obtained her diploma in Accounting and Finance at the Namibian University of Science and Technology. She has worked for Ohlthaver & List Group of companies which is the biggest private sector company in Namibia outside the mining industry. Chevon also supports OLC Solar Energy (Pty) Ltd which is a joint venture for large scale power projects between O&L Energy (Pty) Ltd and CRONIMET.

Michelle Deville

Management Assistant
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In her role as Management Assistant Michelle supports the management board as well as the corporate department in developing organizational structures and networks with special regards to Western Africa. She is further responsible for the marketing department.
Before joining CRONIMET Michelle worked in the Sales & Marketing department of an international hotel chain. She holds a Bachelor’s Degree in Hospitality Management.

Lena Rommerskirchen

Team Assistant
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As a Team Assistant Lena performs all office administrative and accounting duties for the Eschbach and Starnberg office. Furthermore she supports the team’s day to day business and assists with the organization of business trips. Before joining our team, she has worked in sales at a parcel service and a sales agency. She holds a Bachelor’s degree in British and American Studies as well as a certificate as industrial management assistant.

Anga Finini-Khumalo

Team Assistant
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As a Team Assistant Anga performs all front desk and office administrative duties and supports the team’s day to day business.  Before joining our team, she has worked at exporting as well as construction company. She holds a National Diploma in Food Technology at Cape Peninsula University of Technology and has started BTech in Management Services at University of Johannesburg.

Walking the walk in all we do