Climate solutions and sustainable infrastructure investment firm HA Sustainable Infrastructure Capital (HASI) and alternative asset manager KKR announced the expansion of the investment capacity of their clean energy infrastructure-focused co-investment platform, CarbonCount Holdings 1 (CCH1), through the issuance of $508 million in senior unsecured notes in a private offering.

CCH1 intends to use the proceeds to acquire or invest in new and existing sustainable infrastructure projects across the U.S.

Launched in 2024 as a strategic partnership between HASI and KKR, CCH1 provides long-term capital solutions for sustainable infrastructure projects across the U.S. The platform’s investments are aligned with HASI’s existing investment strategy, including a focus on behind-the-meter, grid-connected, renewable natural gas (RNG), and transportation infrastructure projects.

The platform was initially established with $1 billion commitments from each investor, to be invested over 18 months. In December 2025, KKR and HASI each agreed to commit another $500 million. The new transaction marks the second senior note issuance by CCH1, following an inaugural $592 million issuance completed in June 2025. According to the companies, the latest transaction increases the platform’s total investment capacity to nearly $5 billion.

Cecilio Velasco, Managing Director, KKR said:

“The strong investor reception of CCH1’s second issuance reflects the quality and diversity of the underlying asset base. With more than $4 billion of investment capacity at CCH1, we are well-positioned to continue collaborating with HASI to deliver sustainable, reliable, and affordable energy infrastructure to meet the significant demand we see across the U.S.”

HASI Senior Managing Director of Syndications Dan McMahon added:

“We are excited to further expand the investment capacity of CCH1 to support the strong growth in investment activity we are experiencing and continue to enhance our capital efficiency.”

Morgan Stanley and HASI Securities served as Joint Lead Placement Agents on the transaction.