Mainspring's mission is to advance global
access to low-carbon, dispatchable energy by
delivering a new category of power generation.

Mainspring Energy was founded in 2010 by three Stanford University engineers seeking a new approach to generating clean, resilient, affordable electricity. Their research into high-efficiency methods of converting fuel to electricity led to the founding of the company and the development and prototype of their first linear generator. Mainspring, originally called EtaGen, has successfully built and tested three generations of its product in preparation for commercial shipment beginning in 2020. The company’s executive team brings deep expertise from a number of leading clean energy companies, and its top-tier venture and strategic investors bring decades of experience in building successful hardware and energy businesses.

Mainspring’s culture is shaped by the company’s strong sense of mission and rooted in three Core Values:

Pragmatic Optimism.
Building a new category of world-class power generation requires the optimism of ambition and creativity, balanced with practicality to solve problems efficiently. The challenges that arise are opportunities for growth.

Excellence without Ego.
We bring expertise and commitment to creating the best customer experience, from sales to deployment and service, just as we apply deep technical rigor to building and delivering world-class products. We strive for excellence and behave as leaders with the humility to acknowledge our challenges, both collectively and as individual contributors.

Proactive Collaboration.
The integration and cross-disciplinary nature of Mainspring’s business requires intentionally seeking out others who bring different skills, perspectives, and priorities. Our culture of inclusion and respect extends beyond our team to interactions with our partners and customers.

Executive Team


Shannon Miller

Chief Executive Officer
and Founder

Shannon Miller co-founded Mainspring (formerly EtaGen) in 2010 and leads the company as CEO. While completing her doctorate at Stanford, where she was a National Science Foundation Fellow, Shannon received funding from the Global Climate Energy Project to advance her research on methods for improving efficiency of fuel conversion to electricity. In conducting this research, Shannon collaborated with Matt Svrcek to design and develop the early prototype that served as the foundation for Mainspring’s high-efficiency, linear generator technology. She holds a B.S., M.S. and Ph.D. in mechanical engineering from Stanford University and was recognized in 2012 by the MIT Technology Review as one of “35 Innovators Under 35″.

Matt Svrcek

Chief Technology Officer
and Founder

Matt Svrcek co-founded Mainspring (formerly EtaGen) and leads research and development as Chief Technology Officer. While completing his doctorate as a Stanford Graduate Fellow, he received funding from the Global Climate and Energy Project to investigate the efficiency and emissions impact of reacting various fuels under high compression. In performing this research, Matt collaborated with Shannon Miller to design and develop the early prototype that served as the foundation for Mainspring’s high-efficiency, linear generator technology. Prior to Mainspring, Matt served as research manager at Renewable Energy Policy Project in Washington DC, where he analyzed the economic benefits of renewable energy manufacturing.  He holds a B.S., M.S. and Ph.D. in mechanical engineering from Stanford University.

Adam Simpson

Chief Product Officer
and Founder

Adam Simpson co-founded Mainspring (formerly EtaGen) and leads product, external affairs, and intellectual property as Chief Product Officer. While completing his doctorate at Stanford, Adam received funding from the Global Climate Energy Project to advance multi-criteria analysis techniques for making decisions in energy with the goal of guiding economically and environmentally sound investments and policies in a complex and evolving sector. Prior to Mainspring and during his graduate work, Adam consulted for Sandia National Laboratory and various energy-focused venture firms in Silicon Valley. He holds a B.S. in mechanical engineering from Lafayette College and an M.S. and Ph.D. in mechanical engineering from Stanford University.

David DeGraaff

SVP Engineering
& Operations

Dave DeGraaff, Senior Vice President of Engineering and Operations, joined Mainspring in early 2017 to help bring linear generation technology to customers. Prior to joining Mainspring, Dave served as vice president of solar panels at SunPower Corp., where he led module engineering, product management, and reliability. He also served as vice president of engineering at startup Ausra, Inc., where he helped to successfully commercialize a state-of-the-art solar-thermal boiler technology for utility-scale power production that was acquired by Areva. Previous to that, Dave held leadership positions in software companies and was a faculty member in the Thermoscience division of Stanford, where his research focused on turbine cooling in collaboration with GE Aircraft Engines. Dave holds a B.S.E. in mechanical engineering from Princeton University and a Ph.D. in mechanical engineering from Stanford University.

Ken Poczekaj

VP of Global Supply Chain
& Operations

Ken Poczekaj, Vice President of Global Supply Chain and Operations, brings more than a decade of senior management experience in global procurement and supply chain operations to Mainspring. As president of global enterprise execution for Emerson Electric, Ken directed $2.1 billion in global procurement and logistics operations and managed a network of manufacturing sites and warehouses worldwide. When Emerson spun out its power network business in 2016, renaming it Vertiv, Ken became Vertiv’s chief procurement officer. Ken has also served in a number of other leadership positions in the U.S. and Europe and helped to establish new best practices for supply chain management in the data center industry. Ken holds a B.S. in industrial engineering from Southern Illinois University and an M.S. in manufacturing and operations from Washington University.

Yannick Roux

VP of New Product Introduction

Yannick Roux, Vice President of New Product Introduction, joined Mainspring in 2018 following 11 years at Tesla, where he most recently served as director of manufacturing engineering. While at Tesla, Yannick directed the design and deployment of drive-unit manufacturing lines for the Tesla Roadster, Model S, Model X and Model 3, as well as the Battery Pack manufacturing line at the Tesla Gigafactory in Nevada. He developed his expertise in automation equipment, manufacturing and factory deployment in Europe at the Automation division of Renault-Nissan and Fiat, and has served in additional technical management roles in Europe and the Middle East. A native of France, Yannick relocated to the U.S. in 2006 and became an American citizen in 2015. He holds an M.S. in mechanical engineering from ENSIAME in France.

John Igo

Head of Business Development

John Igo, Head of Business Development, joined Mainspring in 2013 to shape the first generation product requirements, develop key partnerships, and oversee the launch of commercial sales. Prior to joining Mainspring, John led development of utility-scale power generation projects at Invenergy, where he was directly responsible for strategically siting and starting over 1,800 MW of installed capacity. He also led technology evaluation and market entry into solar power generation, culminating with the company’s first solar installation, a 20 MW thin-film project he originated in Illinois. John holds a B.S. in mechanical engineering from the University of Kansas, an M.S. in mechanical engineering from Stanford University, and an MBA from the University of Chicago Booth School of Business.

Ryan Fletcher

Head of Finance

Ryan Fletcher, Head of Finance, joined Mainspring in 2019 to lead the company’s finance team, bringing nearly a decade of energy experience to Mainspring from his prior role at SunPower Corporation. At SunPower, Ryan served in senior management roles in manufacturing finance, where he was responsible for planning a $1B annual spend, strategic finance, and corporate controllership. Ryan also helped bring 8point3 Energy Partners to the public markets in 2015. Prior to SunPower, Ryan was an auditor at KPMG LLP, serving clients in the semiconductor, contract manufacturing, and other tech industries. He holds a B.S. in accounting from Santa Clara University and is a CPA in the State of California.