What is a Sustainable Bond?

How Does It Work and Why Is It Important?

The questionof what is a green bond is answered in the context of "sustainable finance", one of the fastest growing areas of finance today. Sustainable bonds (or ESG-oriented debt instruments in general) are designed to channel capital into environmentally and socially beneficial projects. These instruments are a critical part of the Financial Sustainability dimension in the ESGF (Environmental, Social, Governance and Financial) model, as they enable companies to finance green transformation and access a lower cost of capital.

What is a Sustainable Bond?

A sustainable bond is a debt instrument where the proceeds are allocated exclusively to specific environmental (green) or social projects. In this context, the answer to the question of what a green bond is is more specific: They are bonds whose proceeds are dedicated exclusively to environmental projects such as renewable energy, energy efficiency or low-carbon transportation.

Investors around the world are shifting their capital to projects that are aligned with "Net Zero" targets. For example, green bond financing for the construction of the Istanbul metro is an important example of how these instruments are translating into concrete infrastructure projects.

How Do Sustainable Bonds Work?

The working principle of sustainable bonds is similar to conventional bonds, with the main difference being the "intended use of funds" and reporting requirements.

How Does the Sustainable Bond Issuance Process Work?

The question ofwhat is a green bond issuance implies a technical process of verification and classification. The issuance process is based on the following steps:

Classification (Taxonomy): The issuer must prove that the project to be financed is "green". Frameworks such as the EU Taxonomy define which economic activities are considered sustainable, ensuring that capital flows to the right projects.

Verification: To ensure investor confidence, the environmental impacts of projects should be verified by independent organizations. Platforms such as CimpactPro provide the necessary data infrastructure for a green bond solution by reporting companies' emissions data (Scope 1-2-3) and project impacts.

Market Examples: Examples such as tskb green bonds, which are frequently sought by investors in the Turkish market, increase the awareness of these instruments in the local market(Note: Although there is no data specific to TSKB in the sources, it is generally stated that multilateral development banks provide financing to green projects in Turkey).

Transparency and Reporting in Sustainable Bonds

Investors want to be sure that funds are spent where promised. Therefore, issuers of sustainable bonds should provide integrated reports in line with ISSB or GRI standards.

Transparency: Companies report on whether they have achieved their sustainability KPIs (e.g. CO₂ reduction targets). Successful performance can reduce credit costs.

Risk Management: Transparent reporting reduces the risk of "greenwashing" and maintains investor confidence.

Why are Sustainable Bonds Preferred?

Compliance with ESG (Environmental, Social, Governance) criteria is no longer just a reputational issue, but a financial strategy.

Advantages of Sustainable Bonds for Investors

Institutional investors (e.g. asset managers such as BlackRock) want to remove climate risks from their portfolios.

Hedging: Companies with high ESG performance are considered better able to manage long-term risks and are more resilient.

Impact Investing: Investors act according to the principle of "double materiality", which aims to create environmental impact (impact materiality) in addition to financial return.

Benefits of Sustainable Bonds for Companies

For companies, issuing green bonds facilitates access to finance and lowers costs.

Lower Cost of Capital: Companies with high ESG scores or EU Taxonomy compliance can borrow at lower interest rates through "sustainability-linked loans" or green bonds.

New Sources of Funding: Issuing green bonds broadens the company's investor base and provides access to funds that only invest in sustainable assets.

Reputation and Competition: As in the case of Ørsted, a sustainability-based financial transformation increases company value and market confidence.