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Green Rock Energy Partners
Green Rock Energy Partners LLC is a sustainable infrastructure-focused private equity firm which invests in renewable energy companies and projects.
Green Rock Energy Partners
Green Rock Energy Partners LLC is a sustainable infrastructure-focused private equity firm which invests in renewable energy companies and projects. Green Rock primarily focuses on waste-to-value energy assets, which play a critical role in the ongoing energy transition to a low-carbon future. The firm deploys equity capital within the circular economy to develop, purchase, and operate environmentally responsible and financially attractive businesses & infrastructure which produce renewable natural gas, renewable diesel, renewable fertilizer, and other similar products.
General information
Firm type
Asset Manager
Year founded
—
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Stamford
Corporate office
One Dock Street, Stamford, CT 06902
Additional offices
28 Liberty Street, 6th Floor, New York, NY 10005
Principals
Andy Kelleher
Managing Partner & Co-founder
William Forster
Managing Partner & Co-founder
Steven Schmitz
Managing Partner & Co-founder
Martin Mitchell
Managing Partner & Co-founder
Cody Myers
Managing Partner & Co-founder
Ryan Connell
Principal
Ian Kelleher
Vice President
Gunnar Dancer
VP of Commercial
Ariel Bittelman
Senior Analyst
Jack Klinger
Senior Analyst
Sector focus
Frequently asked questions
Who runs investment decisions at Green Rock Energy Partners?
A five-person managing partner group — Andy Kelleher, William Forster, Steven Schmitz, Martin Mitchell, and Cody Myers — jointly leads the firm. The team page does not designate a single CEO or CIO, suggesting a partnership governance model. All five are co-founders who came from commodities executive and trading backgrounds, per the firm's own website.
Is Green Rock structured as a single family office or a traditional private equity firm?
It is structured as a private equity firm, not a family office. There is no disclosed single-family wealth origin. The firm was founded by a team of commodities executives who invest in and operate sustainable infrastructure companies.
Does Green Rock invest through fund commitments or only direct deals?
Available evidence points to direct investing. The firm describes owning and operating its portfolio companies, with three named holdings — BioTown Biogas, Neu Energy Solutions, and Viridi Energy — suggesting a control-oriented, balance-sheet model rather than a fund-of-funds or LP-commitment approach to external managers.
What investment stages does Green Rock typically target?
The firm self-identifies as an early-stage investor targeting companies that are currently profitable within the renewable fuels space. It also maps a pipeline of near-future technologies — green hydrogen and electrification — that it expects to become highly profitable, alongside longer-term expansions into bio-plastics and marine energy.
Which sectors does Green Rock explicitly avoid?
No explicit negative sector list is published. The firm's public strategy concentrates exclusively on sustainable infrastructure and renewable fuels, and it does not profile investments outside of renewable natural gas, renewable diesel, renewable jet, green hydrogen, electrification, bio-plastics, or marine energy.
Does Green Rock maintain philanthropic structures or a foundation?
No philanthropic foundation, impact-investment carve-out, or donor-advised structure associated with Green Rock is publicly disclosed. The firm's sole stated focus is generating economic value through environmentally responsible infrastructure investments.
Where does Green Rock's capital come from?
The firm does not publicly disclose its limited partners or capital source. The five co-founders brought commodities and logistics operating experience to the launch, but no wealth-origin narrative — such as a single-family fortune or institutional anchor investor — is stated on its site.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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