RockPort Capital Partners

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Listed in Venture capitalists (VCs)

Investor type: Venture capital investor
This firm invests in the following funding stages: Seed stage, Early stage, Growth stage, Expansion stage, Late stage
This firm invests in the following industries: Energy efficiency, Energy storage, Smart grid, Solar energy, Wind energy, Misc.
Team (partners, executives and staff):
William E. "Wilber" James, Managing General Partner
David J. Prend, Managing General
Alexander "Hap" Ellis III, General Partner
Janet James, General Partner & COO
Charles J. "Chuck" McDermott, General Partner
Victor Westerlind, General Partner
Stoddard M. "Todd" Wilson, General Partner
Abel Yokell, Partner
Daniel Hullah, Partner
Dhiraj Malkani, Partner
Kevin Kopczynski, Partner
Diane Yung, Partner & CFO
Recent investments / portfolio companies:
Achates Power, Aspen Aerogels, Clean Diesel Technologies, Comverge, Deerpath Energy, Drillmap, EcoFactor, EcoSMART Technologies, Eka Systems, Enki Technology, ENOVIX, Enphase Energy, Evergreen Solar, Exclara, FirstFuel Software, Flywheel, GaN Systems, Gazelle, GlassPoint, Gridco Systems, Honest Buildings, Hycrete, HydroPoint Data Systems, InVisage Technologies, Lilliputian Technologies, LUXIM, Microseismic, Nanogram Corporation, Nanogram Devices Corporation, NeoPhotonics, NewLeaf Symbiotics, Northern Power Systems, Project Frog, Qnovo, Recurve, Renaissance Lighting, Solar Universe, Soliant Energy, Southwest Windpower, Streetline, SustainX, Tioga Energy
Regional and local offices:
3000 Sand Hill Road
Building 2, Suite 110
Menlo Park, CA 94025-7120
Phone: 650-854-9300
Fax: 650-854-9302

RockPort Capital is a multi-stage venture capital firm that invests in the areas of alternative and traditional energy, mobility, and sustainability. For more than a decade RockPort has partnered with entrepreneurs to foster growth and create value in a broad range of industrial and consumer facing companies whose technologies and products provide innovative solutions to significant worldwide markets.

RockPort has a collaborative approach to investing, deep domain expertise, and insights into all aspects of energy and cleantech.


It all begins with partnership – a collegial and collaborative spirit that infuses our own team and extends to the companies in which we invest. We believe that the open exchange of ideas that results from our close collaboration with entrepreneurial management is essential to building strong companies and lasting value.

We were one of the first to identify the investment opportunity in clean energy and related technologies, and have been helping to build companies ever since. We know that given the complexity of the markets in which we operate, success requires a depth of expertise far beyond providing access to capital. Our industry reach, deep market understanding, and first-hand experience in building substantial businesses enable us to successfully transform ideas into marketable products.

RockPort itself is founded on the entrepreneurial experience of our partners in various energy-related fields. We understand that winning companies are built by superior managers, not technology alone. We share the vision, urgency, creativity and determination of our entrepreneurs.


We categorize our primary focus into three segments: Energy, Mobility and Sustainability. Within these segments we invest in companies at all stages of development, from seed stage to companies with substantial commercial revenues. Depending on stage and risk profile, we may invest between $500,000 and $25 million in a round or company. We typically seek significant ownership in return for our invested capital and often lead the initial round in which we participate.

We are long-term partners and understand that it can take time for companies to realize their full potential in our sector. However, we seek companies that address what we consider a near-term need and whose solutions create value on a stand-alone economic basis. We focus on companies that offer highly differentiated and defensible solutions with strong value propositions that drive superior returns.

We know that exceptional management is crucial to executing a winning strategy, and we carefully consider the management teams and investment syndicates with whom we invest. In addition, given our role as active partners alongside management, we generally seek board representation.

Having invested in the energy sector for many years, we have a broad and diverse base of knowledge and contacts, as well as a large portfolio of existing companies, that we make available to our management teams. Since this capability sets RockPort apart, we focus on opportunities in which we can leverage these strengths to add value beyond investment capital.

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