Turning the Tide A Financier's Guide to Investing in Blue Carbon Ecosystems 2026

Barriers to private finance flows in infrastructure TABLE 10 Lack of awareness of available solutionsAt a threshold level, coastal blue infrastructure solutions must compete with well-established grey infrastructure models. Many actors across the infrastructure value chain – governments, asset owners, financiers, insurers, design, engineering and construction firms, including local SMEs – are unaware of the coastal blue infrastructure options available and the benefits of integrating them into coastal infrastructure assets. Government planning and procurement prioritization of grey infrastructureMany national infrastructure plans and government procurement systems are attuned to established grey infrastructure solutions. Without their explicit recognition in infrastructure planning and tender processes, coastal blue infrastructure solutions may not qualify for public financing or public-private partnership (PPP) structures nor secure required permits or approvals from government. Further, cost-benefit analyses to select infrastructure solutions often do not involve adequate consideration of the significant, long-term additional benefits provided by coastal blue infrastructure solutions, including potential carbon credits, climate mitigation, biodiversity maintenance and livelihoods benefits.32 Data and research gaps Grey infrastructure models are highly predictable, with design and material decisions informed by well-understood engineering standards.33 Though evidence is building, comparatively little research into the effectiveness and longevity of coastal blue infrastructure solutions is available across geographies and different use cases.34 Lack of integration into engineering standards and codesRelated to the above, coastal blue infrastructure is often not integrated into engineering standards, codes and practice guides.35 Beyond providing the technical pathway to mainstream coastal blue infrastructure solutions, inclusion in these standards and codes is critical for design, engineering and construction firms to manage their own risk and liability when advising on the integration of these solutions into coastal infrastructure assets. Comparatively unfamiliar opex and capex cost curves Coastal blue infrastructure solutions are likely to have capex and opex profiles that are unfamiliar to investors and financiers, who in turn are used to grey infrastructure cost curves. While grey infrastructure will generally have high upfront capex and relatively low opex (until decommissioning and replacement), coastal blue infrastructure often has comparatively lower upfront capex, but higher ongoing opex requirements for monitoring, adaptive management and maintenance. Also, grey infrastructure eventually diminishes in effectiveness and requires decommissioning and replacement, while well-designed and maintained coastal blue infrastructure can be resilient and self-sustaining. Solutions to unlock private finance in blue infrastructure TABLE 11 Direct finance Design sustainability-linked loans for asset owners deploying/integrating coastal blue infrastructure solutions into assets. Enable equity participation in hybrid blue-grey infrastructure projects that embed blue carbon ecosystems to enhance resilience to physical climate risks. Provide tailored working capital for local SME contractors and service providers engaged in the design, construction and maintenance of coastal blue infrastructure, helping to build a reliable delivery ecosystem around these assets. Implement performance-based financing (akin to energy savings performance contract) where investors fund blue-grey upgrades and are repaid through verified savings such as reduced maintenance costs, avoided losses or insurance premium reductions. Structured finance Arrange or underwrite blue or sustainability-linked instruments or blended finance vehicles that allocate proceeds towards blue carbon-aligned infrastructure. Design thematic infrastructure bonds explicitly including/targeting coastal blue infrastructure solutions. Aggregate small/fragmented project sites to meet minimum ticket thresholds. Enabling finance Provide catalytic concessional capital to support mainstreaming of coastal blue infrastructure solutions, building technical capacity and investor confidence. Extend concessional or catalytic finance for feasibility studies, early-stage pilots and valuation of blue carbon ecosystem services in key areas for new infrastructure, and the integration of blue carbon ecosystem values into infrastructure design standards. Financial solutions to unlock private finance flows Various financial solutions can serve to unlock private finance flows to blue nature-based infrastructure. These interventions are likely to be sequenced across the life cycle of a coastal blue infrastructure project. As noted above, the appropriateness of each finance intervention will be dictated by a project’s commercial and operating context. Turning the Tide: A Financier’s Guide to Investing in Blue Carbon Ecosystems 18