• Partnership targets climate-related private equity co-investments with measurable sustainability outcomes.
• Builds on CalSTRS’ $333 billion portfolio strategy to scale its Sustainable Investment and Stewardship initiatives.
• Expands Carlyle AlpInvest’s responsible investment platform for institutional investors seeking long-term climate value creation.

New Private Market Channel for Climate-Aligned Capital

Carlyle AlpInvest Partners and the California State Teachers’ Retirement System (CalSTRS) have launched a climate-focused co-investment partnership aimed at expanding institutional access to private market opportunities that drive the global energy transition.

The initiative will identify and co-finance deals across sectors aligned with decarbonization, clean infrastructure, and resource efficiency, combining AlpInvest’s global private equity platform with CalSTRS’ Sustainable Investment and Stewardship Strategies (SISS) division. The program broadens CalSTRS’ reach beyond its existing direct climate investment program by enabling participation alongside external managers and funds pursuing climate-aligned growth.

The collaboration reflects a growing institutional shift toward embedding climate risk and opportunity into mainstream private equity strategies. For CalSTRS—the world’s largest educator-only pension fund, managing about $333 billion—such partnerships are increasingly seen as key to achieving both fiduciary and sustainability goals.

Scaling Climate Co-Investments

Carlyle AlpInvest, which manages over $64 billion in assets and specializes in private equity co-investments, will source and underwrite opportunities that align with CalSTRS’ climate investment objectives. The platform is expected to target transactions across North America, Europe, and emerging markets where private capital can accelerate decarbonization or strengthen adaptation measures.

“This partnership expands access to co-investment opportunities with a focus on climate,” said Todd Ruggini, Partner and Managing Director at Carlyle AlpInvest. “It builds on our long-term relationship with CalSTRS and our experience sourcing and executing transactions that meet the evolving needs of large institutional investors.”

For CalSTRS, the initiative forms part of a wider effort to embed sustainability across asset classes while maintaining its core mandate to provide secure retirements for California’s public educators.

“Partnering with Carlyle AlpInvest adds the scale and execution expertise needed to advance our investment objectives,” said Nick Abel, Portfolio Manager for CalSTRS’ Sustainable Investment and Stewardship Strategies. “The collaboration enhances how we access opportunities that deliver both financial results and positive sustainability outcomes.”

Intent-Based Investment Framework

Unlike thematic climate funds with rigid criteria, the AlpInvest–CalSTRS program will employ a flexible, intent-based framework. This structure allows for investments across a wide range of decarbonization themes—such as low-carbon fuels, sustainable manufacturing, and climate-resilient infrastructure—while maintaining alignment with CalSTRS’ broader net-zero commitments.

The approach reflects the growing preference among institutional investors for adaptable climate frameworks that integrate ESG materiality without constraining portfolio diversification. For AlpInvest, it also reinforces its strategy of co-developing long-term value creation models with partners.

“Carlyle AlpInvest is focused on building partnerships that deliver value while supporting investors’ sustainable objectives,” said Maaike van der Schoot, Head of Responsible Investment at Carlyle AlpInvest. “This collaboration reflects our commitment to responsible investment and to helping partners pursue strategies that drive positive, strategic outcomes.”

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Institutional Momentum Toward Climate Finance

The partnership comes as pension funds and sovereign investors are under increasing pressure to align capital allocation with climate transition pathways. Regulatory frameworks such as the EU’s Sustainable Finance Disclosure Regulation (SFDR) and the U.S. Securities and Exchange Commission’s proposed climate-risk rules are pushing asset owners to demonstrate measurable sustainability impacts.

CalSTRS has been gradually increasing its allocation to sustainable and climate-aligned assets through initiatives like its Low-Carbon Transition Readiness strategy and $20 billion Net Zero Portfolio. The new collaboration allows it to further diversify across private equity co-investments, a segment where transparency and active ownership are becoming essential ESG levers.

For Carlyle, whose $425 billion global platform increasingly integrates ESG analytics and stewardship principles, the partnership strengthens its positioning as a conduit between institutional capital and climate-positive growth opportunities.

Broader Implications for ESG-Driven Private Capital

Institutional partnerships of this kind are becoming critical to bridging the capital gap between public climate pledges and real-economy implementation. By combining large pension fund capital with private equity’s execution agility, such frameworks can accelerate financing into hard-to-abate sectors and emerging climate technologies.

For C-suite executives and asset owners, the CalSTRS–Carlyle AlpInvest partnership demonstrates how fiduciary duty and sustainability performance are converging in private markets. The collaboration’s global reach and intent-based flexibility suggest a pragmatic model for scaling climate finance without sacrificing risk-adjusted returns—a priority likely to define the next phase of institutional ESG integration.

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