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Sandbrook Capital
Sandbrook Capital opened in 2022, founded by Alfredo Marti and John Cavalier after long careers at Riverstone Holdings, the energy-focused private-equity...
Sandbrook Capital
Sandbrook Capital opened in 2022, founded by Alfredo Marti and John Cavalier after long careers at Riverstone Holdings, the energy-focused private-equity giant. The firm was purpose-built to own and operate real climate infrastructure rather than trade energy financial assets. Marti and Cavalier brought a Riverstone playbook — heavy operational involvement, hard-asset ownership — to a market that was still dominated by project-finance shops and utility-scale developers. The firm raised its inaugural fund with a reported target of $4.5 billion, making it one of the largest first-time climate funds ever attempted. The firm commits to construction-stage and development-stage projects across North America and Europe, with a particular focus on onshore wind, solar photovoltaic, battery storage, and transmission infrastructure. Sandbrook acquires controlling stakes and brings in-house operating partners to manage construction risk, supply-chain complexity, and offtake contracting. The model resembles a permanent-capital industrial company more than a typical closed-end infrastructure fund. Confirmed investments include a majority stake in rPlus Energies, a Utah-based utility-scale solar and storage developer, and a partnership with Neoen to acquire and operate a portfolio of European renewable assets. The firm has stated it will pursue additional platform investments in grid interconnection and standalone storage. Sandbrook operates from a single office in Stamford, Connecticut, and does not disclose its total team size. Cavalier and Marti have both emphasized the fund's focus on control-oriented, build-and-hold strategies rather than the flip-and-sell model common among development-stage investors. The firm's known adjacent structures include an in-house operating platform for construction management, though it has not spun out separate philanthropic or family-office vehicles. In November 2023, Sandbrook announced its first major platform acquisition, taking a majority stake in rPlus Energies alongside continued investment from Gardner Group, signaling its commitment to deploying at scale early in the fund's life. The structural differentiator is Sandbrook's insistence on vertically integrated operational ownership. Unlike most climate-infrastructure firms that hire third-party EPC contractors or rely on development partners to manage assets, Sandbrook builds an internal operating company around each platform investment. This gives the firm direct control over construction timelines, equipment procurement, and offtake negotiations — a costly model that demands deep sector expertise but promises margin capture that passive infrastructure investors cannot access.
General information
Firm type
Asset Manager
Year founded
2022
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Stamford
Corporate office
Stamford, CT, United States
Principals
Alfredo Marti
Managing Partner & Co-Founder
John A. Cavalier
Managing Partner & Co-Founder
Sector focus
Frequently asked questions
Who runs investment decisions at Sandbrook Capital?
Alfredo Marti and John Cavalier serve as Managing Partners and co-founders, and they make investment decisions jointly. Both spent significant portions of their careers at Riverstone Holdings, where they developed the operational, control-oriented approach that Sandbrook now applies to climate infrastructure. The firm has not disclosed a separate CIO or independent investment committee.
How does Sandbrook Capital source proprietary deal flow?
Sandbrook sources opportunities through deep developer relationships and its partners' decades of energy-sector networks. The firm targets construction-stage projects that require significant operational oversight — a profile that screens out many passive infrastructure funds. By offering to build and operate assets in-house rather than relying on third-party EPC contractors, Sandbrook positions itself as a differentiated partner for developers who want a hands-on, long-term capital provider.
Is Sandbrook structured as a private equity firm or an infrastructure fund?
Sandbrook operates as a closed-end private equity fund but behaves more like a permanent-capital industrial holding company. The firm takes controlling stakes in renewable energy and grid assets, builds internal operating teams around those platforms, and intends to hold them long-term rather than exiting on a typical three-to-five-year cycle. This hybrid model distinguishes it from both conventional infrastructure funds and energy buyout shops.
Does Sandbrook participate in fund commitments or only direct deals?
Sandbrook exclusively makes direct platform investments. The firm does not commit capital to third-party funds or pursue minority-stake club deals. Its model requires control positions — typically majority stakes — so it can deploy its in-house operating platform to manage construction, procurement, and commercial operations directly.
What investment stages does Sandbrook Capital target?
The firm targets construction-stage and late-development-stage energy projects and platforms. Sandbrook intentionally avoids early-stage technology risk, preferring assets with permitted sites, secured grid interconnection, and credible offtake contracts. Its focus on actual steel-in-the-ground construction risk rather than pre-revenue development risk is a defining feature of its investment mandate.
How is Sandbrook related to Riverstone Holdings?
Sandbrook Capital was founded in 2022 by Alfredo Marti and John Cavalier, both former senior partners at Riverstone Holdings. The new firm applies a similarly operationally intensive, control-ownership model to climate infrastructure — a sector Riverstone historically approached through conventional energy private equity. Sandbrook is entirely independent, with no disclosed financial or governance ties to Riverstone.
What is Sandbrook Capital's known posture on co-investments alongside external GPs?
Sandbrook has not offered co-investment rights to external limited partners. The firm's control-orientation and in-house operational model make passive co-investment alongside other GPs impractical. When Sandbrook bought rPlus Energies, it structured the deal to retain Gardner Group as a minority partner, but that reflected the specific asset's legacy ownership rather than a broader co-investment program.
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