Growth Capital for the Clean Economy

Financing the Next Generation of Energy Innovation

WindSail Capital provides flexible debt solutions to companies advancing sustainability and clean energy, accelerating growth without unnecessary dilution.

Our ApproachView Portfolio
Who We Are

A Different Kind of Growth Capital Partner

WindSail Capital Group is a leading provider of growth capital to companies advancing energy innovation and sustainability. Our unique investment approach provides flexible financing that facilitates growth while minimizing dilution, filling a critical gap in the market for energy innovation and sustainability businesses.

01
Deep Energy Industry Expertise

Decades of relationships across clean energy, sustainability and climate technology.

02
Creative Capital Structures

Financing designed around each company’s growth trajectory.

03
True Partnership Model

Guidance, introductions and strategic counsel beyond capital.

04
Underserved Market Focus

Capital for segments between traditional venture equity and institutional lending.

05
No Institutional Equity Required

Founder-backed, between rounds or alongside a raise.

06
Growth Capital, Less Dilution

Founders retain control.

Learn more about our approach

Companies We’ve Backed

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Get In Touch

Let’s Start a Conversation

Whether you’re a climate tech founder seeking growth capital or part of the broader clean energy ecosystem, we’d love to hear from you.

133 Federal Street, 9th Floor
Boston, MA 02110