The financing of large-scale infrastructure has increasingly shifted toward private capital as governments confront fiscal constraints, rising public debt, and expanding investment needs. Private participation through public-private partnerships, project finance structures, infrastructure funds, and institutional investors has reshaped how risks are allocated across the infrastructure lifecycle. While this shift promises efficiency gains, innovation, and accelerated project delivery, it also introduces complex financial stability considerations that warrant careful scrutiny. From a risk allocation perspective, private capital reallocates construction, operational, demand, and financing risks away from sovereign balance sheets toward private sponsors, lenders, and investors. When designed effectively, such allocations align incentives, improve cost discipline, and enhance asset performance. However, poorly structured contracts, optimistic demand forecasts, or implicit government guarantees can re-socialize risks during periods of stress, undermining the intended fiscal benefits. The growing role of leveraged vehicles, long-duration assets, and cross-border capital flows further amplifies exposure to interest rate volatility, refinancing risk, and macroeconomic shocks. From a financial stability standpoint, the deepening involvement of banks, pension funds, insurers, and alternative asset managers in infrastructure financing links essential public services to broader capital market dynamics. Concentration risks, valuation opacity, and procyclicality may transmit stress across financial systems if not adequately regulated. This perspective underscores the need for robust governance frameworks, transparent risk-sharing mechanisms, and prudential oversight that balances investment mobilization with systemic resilience. Ultimately, sustainable infrastructure financing depends not only on attracting private capital, but on structuring it in ways that preserve long-term financial stability and public value.