Green Bonds and Sustainability-Linked Loans: Why Borrowers and Lenders Use Them

Green bonds and sustainability-linked loans are frequently grouped together under sustainable finance. From a borrower's perspective, their mechanics are materially different.

A green bond raises capital for eligible green projects or expenditures. The issuer identifies how the proceeds will be used, tracks their allocation and reports to investors on the financed assets and environmental impact.

A sustainability-linked loan, or SLL, does not require the borrower to spend the loan proceeds on a particular green asset. The loan is linked instead to measurable sustainability performance. The borrower agrees key performance indicators and sustainability performance targets with the lender group. Meeting or missing those targets changes an agreed economic or structural feature of the facility, most commonly the interest margin.

Both structures can broaden the financing conversation for companies with credible environmental investment programs or measurable transition strategies. Financely advises issuers seeking green bond financing, structured debt and project capital across renewable energy, infrastructure, industrial and corporate transactions.

How a Green Bond Works

A green bond is debt. The issuer still owes principal and interest under conventional bond documentation. The green designation comes from the use of proceeds and the framework governing eligible projects, allocation and reporting.

Under the ICMA Green Bond Principles, the issuer establishes eligible Green Projects and explains how those projects fit the bond framework. Eligible categories can include renewable energy, energy efficiency, clean transportation, green buildings, pollution prevention, climate adaptation, sustainable water infrastructure and other qualifying environmental activities.

Net proceeds, or an amount equivalent to the net proceeds, are tracked through an internal account, sub-portfolio or other documented process. Investors then receive allocation reporting showing where the capital was deployed.

Impact reporting adds another layer. A renewable energy issuer could report installed generation capacity, estimated annual renewable generation and avoided greenhouse gas emissions using a disclosed methodology. A green-building issuer could report certified floor area, energy intensity or energy savings.

What a Green Bond Does Not Change

The green label does not replace credit underwriting.

Bond investors still examine leverage, interest coverage, liquidity, maturity profile, cash generation, covenant protection, security, seniority and refinancing risk. A weak borrower does not become investment grade because the proceeds finance solar assets.

Project-level issuers face the same requirement. A green bond financing renewable infrastructure still depends on PPAs, resource studies, construction contracts, operating assumptions, permits, insurance and project cash flow.

The sustainable-finance framework creates an additional layer of eligibility and disclosure around otherwise conventional credit analysis.

Why Borrowers Issue Green Bonds

The first advantage is investor diversification.

A conventional corporate bond competes for capital across the full fixed-income market. A properly structured green bond remains available to those investors while also qualifying for portfolios, mandates and funds that specifically allocate capital to green or sustainable assets.

That larger potential order book can matter during issuance. A company already planning substantial renewable-energy, efficiency or clean-infrastructure expenditure can classify qualifying expenditures under a green bond framework and approach investors whose mandates would otherwise exclude a conventional issue.

The result is not necessarily a lower coupon on every transaction. Pricing still depends on issuer credit, market conditions, maturity, currency, liquidity and investor demand. A well-received green issue can, however, produce stronger demand or tighter pricing than the issuer would otherwise achieve when dedicated green capital materially expands the book.

Green Bonds Can Finance Existing Assets as Well as New Projects

Green issuance does not have to fund a single greenfield project.

An operating company can issue against a portfolio of eligible investments. A utility could allocate proceeds across solar farms, wind assets, battery storage, grid modernization and energy-efficiency programs. A property company could refinance qualifying green buildings. A manufacturer could allocate proceeds to qualifying energy-efficiency or clean-production investments.

The eligibility criteria and look-back period for refinancing need to be documented in the Green Bond Framework. Issuers with a sufficiently large recurring green capital expenditure program can use the framework for repeated issuance rather than rebuilding the methodology for each bond.

A Green Bond Framework Becomes Part of the Financing Infrastructure

A serious issuer prepares the framework before marketing the bond.

The framework normally addresses:

• eligible green project categories;
• excluded activities;
• the process used to evaluate and select projects;
• management and tracking of proceeds;
• temporary treatment of unallocated proceeds;
• allocation reporting;
• impact reporting methodology;
• governance and internal approval responsibilities; and
• external review arrangements.

External review adds credibility for investors. Depending on the transaction and market, that work can involve a second-party opinion, verification, certification or another recognized review process.

Green Bond Issuance Has Additional Costs

The borrower incurs the normal cost of issuing debt and a separate sustainable-finance workstream.

Underwriters, legal counsel, auditors, listing venues and settlement infrastructure remain necessary. The issuer also needs a Green Bond Framework, external review and ongoing allocation and impact reporting.

These expenses should be evaluated against the size of the transaction and expected financing benefit. Financely provides a separate breakdown of green bond issuance costs for issuers deciding whether the bond market is appropriate for their capital requirement.

How a Sustainability-Linked Loan Works

Sustainability-linked loans start from the borrower's operating performance rather than the assets financed.

A company could use an SLL as a revolving credit facility, term loan, acquisition facility or another corporate borrowing structure. The proceeds do not have to be allocated exclusively to green expenditure.

The lender and borrower agree one or more KPIs that are material to the business. Each KPI has corresponding Sustainability Performance Targets, or SPTs, establishing the required level of improvement over the loan term.

The loan documents then connect performance to the facility economics. A margin adjustment is the most familiar structure. Achievement of the relevant SPT can reduce the margin. Missing the target can increase it. The precise mechanism is negotiated in the credit agreement.

The KPI Has to Matter to the Borrower's Business

A mining company should not obtain sustainability-linked pricing because it reduced office paper consumption.

The selected KPI needs to address a material sustainability issue associated with the borrower's operations and strategy. For an industrial company, that could involve Scope 1 and Scope 2 emissions intensity. A cement producer could use clinker-related emissions. A logistics company could target fleet emissions. A power producer could use generation emissions intensity or renewable capacity where appropriate to its transition plan.

Water consumption can be relevant for businesses operating in water-intensive sectors. Workplace safety, waste, biodiversity or other indicators can also qualify where they represent material issues and can be measured consistently.

The LMA's 2025 Sustainability-Linked Loan Principles require KPIs to be relevant, core and material to the borrower's business, measurable on a consistent basis, externally verifiable where feasible and capable of being benchmarked where possible.

Sustainability Performance Targets Have to Be Ambitious

The target cannot simply reward the borrower for an improvement that was already going to occur under ordinary operations or because regulation requires it.

SPTs are calibrated against the borrower's historical performance, peer performance, sector standards and relevant scientific or regulatory pathways where appropriate.

The baseline needs to be defined precisely. So does the scope of the KPI. Acquisitions, disposals and major changes in corporate structure can make the original baseline inappropriate, which is why loan documentation usually contains recalculation mechanics for specified events.

Current market principles call for annual SPTs for each KPI during the loan term unless the transaction has a strong reason for another measurement frequency.

An Illustrative Sustainability-Linked Loan

Consider an industrial manufacturer refinancing a USD 150 million five-year revolving credit facility.

The company has measured Scope 1 and Scope 2 greenhouse gas emissions across its operating facilities for several years. The lender group accepts emissions intensity per unit of production as a material KPI.

The loan agreement establishes annual emissions-intensity targets through maturity. Independent assurance confirms the reported performance after each measurement period.

The parties could agree that the credit margin falls by 5 basis points when the relevant SPT is achieved and increases by 5 basis points when it is missed.

Those figures are illustrative rather than market quotations. The commercial point is the mechanism: sustainability performance produces a measurable financial consequence under an otherwise conventional corporate credit facility.

Why Borrowers Use Sustainability-Linked Loans

SLLs are useful for companies with meaningful sustainability objectives but no immediate need to ring-fence debt proceeds for a portfolio of qualifying green assets.

A manufacturer can refinance general corporate debt through an SLL. A commodity company can finance working capital while linking pricing to emissions performance. A logistics business can maintain normal use-of-proceeds flexibility while committing to measurable fleet decarbonization.

The structure also creates a direct financing incentive for management. Treasury, operations and sustainability teams now have a common metric because failure to meet an SPT has a contractual financial consequence.

For borrowers with multiple relationship banks, an SLL also gives the banking group a common sustainability framework instead of negotiating unrelated ESG conditions with each institution.

Why Lenders Offer Sustainability-Linked Pricing

A 5-basis-point pricing reduction is not philanthropy.

Banks compete for corporate lending mandates. Offering a sustainability-linked facility deepens the relationship with a borrower that already has a credible sustainability program and creates additional structuring work for the arranging banks.

The facility also generates data. A lender receives regular information on a material operational indicator that can affect future credit quality. Energy consumption, carbon intensity, water exposure and transition investment can have direct implications for operating costs, regulatory exposure and capital expenditure.

Lenders with internal sustainable-finance targets also need qualifying transactions for their loan books. A credible SLL gives the bank an asset that can be classified under its sustainable-finance framework, subject to the bank's own methodology and the applicable market principles.

Green Bonds Give Investors a Traceable Use of Capital

The investor incentive in a green bond is different.

Dedicated green bond funds, sustainability mandates, insurance portfolios, pension funds and institutional investors can purchase debt with a documented connection to eligible environmental projects.

Allocation reporting allows the investor to identify where the issuer deployed the proceeds. Impact reporting provides data that can feed the investor's own portfolio reporting.

This matters for institutions that have promised clients, beneficiaries or investment committees that a defined portion of the portfolio will finance environmental activities. A conventional unrestricted corporate bond gives them less project-level traceability.

Banks Also Have an Incentive to Arrange Green Bonds

Investment banks earn underwriting and structuring fees from green issuance just as they do from conventional debt capital markets transactions.

A green bond also gives the bank another transaction to distribute to sustainable fixed-income investors. The bank's sustainable-finance or ESG capital-markets team participates in framework development, investor positioning and marketing alongside the conventional debt capital markets desk.

Issuers should still select underwriters based on distribution capability, sector experience, currency, investor access and execution quality. A bank's green credentials do not compensate for weak debt capital markets distribution.

Financely maintains a separate overview of banks active in green bond issuance for corporate and project issuers considering the market.

Green Bonds Can Support a Better Maturity Match for Infrastructure

Renewable energy and infrastructure assets require large amounts of capital upfront and generate cash over long operating periods.

Bond financing becomes attractive once the project or portfolio has sufficient scale, operating stability and investor acceptance. Sponsors can refinance shorter-tenor construction debt with longer-dated capital-market debt after commercial operation.

A renewable portfolio containing several operating assets can also reduce single-project concentration and create a bond issuance large enough for institutional investors.

Sponsors developing these assets can review Financely's renewable energy project finance work alongside green bond financing because the appropriate capital source changes as an asset moves from development through construction into operations.

Sustainability-Linked Loans Preserve Use-of-Proceeds Flexibility

This is one of their most useful commercial features.

A company can use the facility for permitted general corporate purposes while still giving lenders measurable sustainability commitments. The borrower does not need to maintain a separate allocation ledger linking every dollar drawn to an eligible environmental asset.

That makes an SLL well suited to revolving credit facilities. Drawings and repayments fluctuate constantly, so a project-by-project use-of-proceeds methodology would add unnecessary administrative friction.

The borrower trades that flexibility for another obligation: annual KPI measurement, reporting and verification across the life of the loan.

Green Loans Sit Between the Two Structures

Borrowers do not need to access the bond market to obtain use-of-proceeds green financing.

A green loan applies a similar concept through the loan market. The defining characteristic is the use of proceeds for eligible Green Projects. The LMA's Green Loan Principles set out the relevant framework for use of proceeds, project evaluation, management of proceeds and reporting.

A borrower financing a USD 75 million solar portfolio could therefore use a bilateral or syndicated green loan rather than issue a bond. This can make more sense where the financing requirement is too small for efficient capital-market execution or where the sponsor wants greater flexibility to amend the financing with a relationship-bank group.

Green loans and green bonds belong to the use-of-proceeds family. Sustainability-linked loans belong to the performance-linked family.

Green Bond vs Sustainability-Linked Loan

Borrowers Should Calculate Whether the Pricing Benefit Covers the Added Work

Sustainable-finance labels create compliance costs.

An SLL borrower needs reliable baseline data, internal measurement systems, sustainability reporting and independent verification. Legal counsel has to document the KPI definitions, SPTs, observation dates, recalculation events and pricing adjustment.

Consider a USD 100 million facility with a 5-basis-point sustainability margin reduction. If the full facility remains drawn for one year and the borrower achieves the target, the gross annual interest saving is USD 50,000.

That does not mean the SLL is uneconomic. The borrower could also benefit from lender diversification, better alignment with relationship banks and integration of its financing with an existing sustainability program. It does mean a company should not spend USD 200,000 creating an elaborate sustainability framework solely to chase USD 50,000 of annual pricing benefit.

Transaction size matters.

Greenwashing Risk Directly Affects Financing Credibility

Sustainable-finance markets became more demanding after early transactions used weak targets or loose definitions.

A KPI that covers only a small part of the borrower's environmental footprint produces limited credibility. A target already achieved before the loan closes has no incentive value. A baseline that can be adjusted whenever performance deteriorates defeats the purpose of the mechanism.

Green bonds face similar scrutiny. The issuer should be able to demonstrate why financed assets qualify, how proceeds are tracked and whether reported impact is measured consistently.

Poorly designed sustainable-finance documentation creates reputational and refinancing risk for both sides of the transaction. Banks and institutional investors therefore pay close attention to materiality, ambition and external verification before attaching a green or sustainability-linked label.

Missing an SPT Usually Changes the Economics, Not the Borrower's Solvency

Sustainability-linked pricing mechanics should be distinguished from ordinary financial covenants.

If the borrower misses an agreed emissions target, the documented consequence could be a margin increase. That event does not necessarily constitute an event of default under the facility.

The credit agreement determines the consequence. Failure to provide required sustainability reporting or verification can be treated differently from simply missing a performance target.

This distinction deserves attention during documentation. Treasury needs to understand the pricing mechanics while legal counsel ensures the sustainability provisions do not create unintended cross-default or representation issues.

Sustainability-Linked Debt Works Particularly Well for Transitioning Businesses

A company does not need to operate exclusively in a green sector to use an SLL.

An industrial company, mining business, commodity trader, transport group or real estate portfolio can establish KPIs around the material sustainability impacts of its existing operations.

This is useful for sectors where replacing the entire capital structure with project-specific green financing would be unrealistic. The SLL gives lenders a mechanism to attach financing economics to measurable operating improvements while preserving ordinary corporate funding flexibility.

The targets still need to go beyond routine compliance and ordinary business-as-usual performance.

Green Bonds Are Better Suited to Large Identifiable Investment Programs

A utility building USD 500 million of renewable generation has a clear use-of-proceeds pool. A real estate company refinancing a large portfolio of qualifying energy-efficient buildings has another.

The issuer can identify eligible expenditure, issue debt against that portfolio and report allocations to investors.

Bond execution becomes more attractive as transaction size rises because fixed issuance costs can be spread over a larger financing amount and institutional investor distribution becomes more efficient.

Companies assessing the market can review Financely's current overview of issuing green bonds in 2026.

The Same Borrower Can Use Both

Green bonds and sustainability-linked loans do not have to compete for the same position in the capital structure.

A large infrastructure company could issue a green bond to finance renewable-energy assets while maintaining a sustainability-linked revolving credit facility for general liquidity.

The green bond tracks capital allocated to environmental projects. The RCF measures corporate performance against agreed sustainability KPIs. The two facilities serve separate treasury functions.

Larger issuers increasingly treat sustainable finance as part of the overall funding program rather than as a one-off product.

Lenders Still Need a Repayment Source

Environmental eligibility does not answer the central credit question.

A green project needs revenues sufficient to repay project debt. A corporate green bond issuer needs enough cash generation to service the bond. An SLL borrower still has to satisfy leverage, liquidity and debt-service requirements.

Sustainable-finance structuring is most useful after the underlying credit has been defined. The adviser can then determine whether green bond, green loan, sustainability-linked or conventional financing offers the strongest route to market.

Structuring Green and Sustainability-Linked Debt

Financely works with companies, project sponsors and asset owners seeking debt for renewable energy, infrastructure, real estate and corporate investment programs.

For green bond mandates, the work can include transaction assessment, financing structure, framework coordination, capital-markets preparation, data-room organization, underwriter or placement discussions and transaction execution.

Financely also advises property and infrastructure issuers on green and ESG-linked bond issuance where the underlying asset base supports sustainable debt placement.

Renewable sponsors looking for loan-market financing can also use our solar and renewable energy project finance platform before deciding whether later refinancing through a green bond is appropriate.

What a Borrower Should Prepare

A green bond issuer should arrive with a defined funding requirement and a sufficient pipeline of eligible assets or expenditures. The financing team will need the normal corporate or project credit package together with the sustainability documentation supporting eligibility.

An SLL borrower needs historical KPI data before target calibration begins. A bank cannot set a credible reduction trajectory if the company has no reliable baseline.

The initial financing package should therefore include, as applicable:

• historical financial statements;
• current management accounts;
• existing debt schedule;
• financial projections;
• proposed financing amount and tenor;
• eligible green project pipeline for use-of-proceeds financing;
• historical emissions or other KPI data for sustainability-linked financing;
• existing sustainability targets and policies;
• supporting technical documentation;
• capital expenditure program; and
• current lender or investor term sheets where available.

Request Green or Sustainability-Linked Financing

Financely reviews the underlying credit requirement before recommending a sustainable-finance structure. The transaction has to work as debt before a green or sustainability-linked label adds value.

Eligible issuers can submit the financing amount, use of proceeds, current debt profile, project pipeline, sustainability data and available transaction documents for mandate review.