Green Finance: Sustainable Financing Instruments for Mid-Sized Companies

Sustainability is no longer a niche topic but a central factor in corporate finance. Banks, investors and development institutions are increasingly aligning their lending criteria with ESG standards. For mid-sized companies, this creates not only new obligations but, above all, attractive financing opportunities. Those who understand the instruments and requirements can secure more favourable terms while strengthening their competitive position.

The Key Green Financing Instruments

Green Bonds

Green Bonds are fixed-income securities whose proceeds are earmarked for environmentally sustainable projects. What was long reserved for large corporations and sovereign issuers is becoming increasingly relevant for mid-sized emitters through the EU Green Bond Standard (EU GBS).

The key features of a Green Bond are:

Earmarking of proceeds (Use of Proceeds) for taxonomy-aligned projects
External verification by an authorised reviewer
Regular reporting on the use of proceeds
Transparency towards investors regarding the environmental impact

The EU Green Bond Standard, which has been applicable since the end of 2024, requires full alignment with the EU Taxonomy. For mid-sized companies, the conventional Green Bond only becomes economically viable from a volume of approximately 50 million euros due to issuance costs. Smaller companies can, however, participate through Green Schuldscheindarlehen or bundled issuances.

Sustainability-Linked Loans (SLL)

Sustainability-Linked Loans are arguably the most practical instrument for mid-sized companies. Unlike the Green Bond, the use of proceeds is not earmarked; instead, the loan terms are linked to the achievement of sustainability targets.

The mechanism is straightforward:

The company agrees on Sustainability Performance Targets (SPTs) with the bank
If the targets are met, the credit margin decreases; if missed, it increases
Typical KPIs include CO2 reduction, energy efficiency, waste reduction or social metrics
The proceeds themselves can be used freely

Practical tip: When negotiating SPTs, ensure that the targets are ambitious yet realistic. Targets that are too easy to achieve may be perceived as greenwashing, negating the reputational benefit.

KfW Climate Action Programme for Mid-Sized Companies

The KfW offers the Climate Action Programme for Mid-Sized Companies (Programme 293), a funding programme specifically tailored to small and medium-sized enterprises. The terms are particularly attractive:

Subsidised loans of up to 25 million euros per project
Repayment subsidies of up to 6 per cent of the loan amount
Financing of investments contributing to EU Taxonomy alignment
Application through the company's regular bank

Eligible investments include renewable energy, energy-efficient building renovation, sustainable mobility and the circular economy. The KfW requires a taxonomy conformity assessment, demonstrating that the investment makes a substantial contribution to one of the six environmental objectives without significantly harming any of the others (Do No Significant Harm principle).

Green Schuldscheindarlehen

The Schuldscheindarlehen has been an established financing instrument in the German mid-market for decades. In its green variant, it combines the flexibility of the traditional Schuldschein with the requirements of sustainable finance.

Advantages over the Green Bond:

Lower transaction costs and fewer regulatory requirements
Lower minimum volumes (from approximately 10 million euros)
No stock exchange listing required
Bilateral structuring with a small number of investors possible

The documentation follows the Green Loan Principles of the Loan Market Association (LMA) and typically includes a Green Finance Framework, a Second Party Opinion and regular impact reporting.

Carbon Credit Financing

A comparatively new instrument is financing through CO2 certificates and carbon credits. Companies that participate in emissions trading on a voluntary or mandatory basis can use their certificates as collateral or finance CO2 compensation projects.

For mid-sized companies, this instrument is particularly relevant when:

The company is subject to the EU Emissions Trading System (EU ETS)
Surplus certificates can serve as additional loan collateral
Investments in proprietary CO2 reduction projects need to be financed

Comparison of Instruments

Instrument	Minimum volume	Complexity	Cost	Suitable for
Green Bond	from EUR 50m	High	High	Large mid-sized companies
Sustainability-Linked Loan	from EUR 1m	Medium	Low	All mid-sized companies
KfW Climate Action Programme	up to EUR 25m	Medium	Very low	SMEs with green investments
Green Schuldschein	from EUR 10m	Medium	Medium	Upper mid-market
Carbon Credit Financing	variable	High	Medium	EU ETS participants

Documentation and Reporting Requirements

Regardless of the chosen instrument, mid-sized companies face significant documentation requirements. These typically include:

Green Finance Framework

A company-specific framework describing the sustainability strategy, the selection criteria for eligible projects, the management of proceeds and the reporting obligations. This document forms the basis for any green financing.

Second Party Opinion (SPO)

An independent assessment of the Green Finance Framework by a specialised provider such as ISS ESG, Sustainalytics or CICERO. The SPO confirms alignment with recognised standards and enhances credibility with investors.

Ongoing Reporting

Annual reports on allocation of proceeds (Allocation Reporting) and environmental impact (Impact Reporting) are mandatory for most instruments. Requirements regarding granularity and audit vary depending on the instrument and investor base.

Avoiding Greenwashing Risks

The increasing regulation of sustainable financial products also entails risks. Greenwashing — the misleading presentation of financial products or corporate activities as sustainable — can have significant legal and reputational consequences.

Avoid the following pitfalls:

Vague sustainability commitments without measurable KPIs
Lack of taxonomy alignment for investments labelled as "green"
Cherry picking — selective presentation of positive aspects while concealing negative impacts
Insufficient data to support claimed environmental benefits

The EU Taxonomy Regulation defines six environmental objectives and establishes technical screening criteria for assessing the sustainability of an economic activity. A thorough review of taxonomy alignment before issuance or borrowing is essential.

Practical Entry Points for Mid-Sized Companies

The entry into Green Finance need not begin with complex capital market instruments. The following steps have proven effective in practice:

Stocktaking: Identify existing and planned investments with a sustainability dimension
Discussion with your bank: Many banks already offer ESG-linked credit products — ask proactively
Check KfW funding: The Climate Action Programme offers the most favourable terms with manageable effort
Build sustainability data: Begin systematically recording environmental metrics at an early stage
Seek advice: Structuring green financing requires specialised expertise

Conclusion

Green Finance offers mid-sized companies genuine opportunities: more favourable financing terms, access to new investor groups and a strengthened market position. The key lies in selecting the right instrument, ensuring robust documentation and credibly embedding sustainability in the corporate strategy. Requirements for transparency and taxonomy alignment are continuously increasing — those who lay the foundations now will gain a lasting competitive advantage.

compleneo advises mid-sized companies on structuring sustainable financing, evaluating funding opportunities and meeting regulatory requirements in the field of Green Finance.