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Management Team

Paul Winnowski , Chief Executive Officer

Paul Winnowski is the Chief Executive Officer for Mainstream Energy and its subsidiaries. Paul brings 20-plus years of experience at the helm of large corporations in highly-competitive markets. He previously served as President of United Technologies Fire & Security in North Europe & South Africa, where he was responsible for well over $1Bn in sales and more than 13,000 employees. Prior to this, he managed UTC’s Fire & Security business in Asia with over $500M in sales and 4,000 employees. Winnowski also held a number of leadership roles at General Electric, where he built GE Security’s business in China and Asia, and began his career scaling a private company from $30M to $650M in revenues, ultimately leading to acquisition by GE. “Making solar more affordable and accessible is core to Mainstream’s vision and vital for the continued growth of the company,” Winnowski said. “As I’ve learned in the fire and security industry, companies that focus on improving customer benefits and lowering cost while building scalable business processes are the ones which will ultimately emerge as sustainable and profitable industry leaders. Mainstream’s reputation, experience, relationships and resources provide a solid foundation to build on as we strive to make solar increasingly attractive to a rapidly expanding range of customers.”

Ken Ambur, General Counsel

Ken Ambur is the General Counsel for Mainstream Energy and its subsidiaries. He is responsible for advising the board and executive management team, leading the law department and overall risk management. With 13 years in the energy industry, Ken is passionate about using his business and legal expertise to help Mainstream Energy grow and thrive. He contributes to Mainstream’s overall business strategy, using law as a tool to help them do business in a smart way. Prior to Mainstream, Ken was General Counsel for NAES Corporation in Issaquah, WA, where he led negotiations for commercial agreements, managed technology licensing and directed complex transaction documentation. Ken holds a JD from the University of Washington School of Law and a BA in Political Science from the University of Washington. He is an accomplished mountaineer, and credits leading mountain climbing trips for beginners as a key to sharpening his leadership skills.