About me
Dr. Thomas Sonntag-Rösing
I have been managing the engineering firm C4SP for consulting and support in plant and mechanical engineering since 2023.
With over 25 years of international experience in energy plant construction, I support companies in making their projects, processes and business models future-proof.
Whether it is offer strategy, project planning or business development – I support you with technical expertise, entrepreneurial understanding and an eye for the essentials.

Professional Consulting & Support
My Philosophy
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Sustainable optimization of structures and processes as well as sustainable strengthening of the operational business
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Long-term strengthening of my clients' employees, organizations and businesses
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Collaboration with multicultural and interdisciplinary teams
Highlights of my professional career
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Leadership Responsibility:
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Tender and department manager for the planning of turnkey EPC projects
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Head of Sales, Marketing & Communication, Project Planning and Cost Calculation
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"SVP Sales & Proposals" with a focus on strategic business development and order planning in the European market
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Project references:
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Thermal power plants for electricity and heat generation (coal, gas, biomass)
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Innovative technologies such as synthesis gas generation / gasification technologies, hydrothermal carbonation, carbon capture (CCS/CCU) and fuel cells
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Future-oriented projects: Power plant modernizations (fuel metabolism), hydrogen/electrolysis plants, heat pumps and storage systems (battery storage/solid heat storage)
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Additional qualifications
In addition to my technical expertise, I have further qualified myself through various management training courses, including:
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Hitachi - Ready to Inspire - Global Management Development Program (London, 2009)
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Mitsubishi Heavy Industries - MHI Inter-Regional Talent Management Leadership Program (Sydney, 2019)
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Mitsubishi Power Europe - Executive Leadership To Go Program (Duisburg, 2020)
These further training courses underline my competence in the strategic management and implementation of complex projects and organizational issues.