AI Data Center Buildout Faces Investor Skepticism as Speculative Projects Hit Debt Headwinds

The artificial intelligence infrastructure boom is straining debt markets as investors increasingly pull back from speculative data center projects and demand substantial risk premiums from less established borrowers. The AI sector's ambitions to build out $3 to $5 trillion in data center capacity by decade's end have become heavily dependent on debt financing, with corporate bond issuance from tech companies projected to reach nearly $570 billion in 2026 alone. Yet this borrowing surge is creating fault lines: while investment-grade hyperscalers such as Amazon, Microsoft, and Google can still access capital, smaller and less proven data center developers are finding it far harder to secure financing without making concessions to wary bondholders.