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.

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.

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.

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.

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.

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.

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.