Registered Audit Firm in Germany
Your Official Partner for the ZF Green Electricity Verification You have been selected by ZF for the mandatory verification of your 100% Green Electricity Commitment (Reporting Year 2025). As ZF's official cooperation partner, we provide a streamlined verification path with pre-negotiated, below-market rates, eliminating the need to search for an external auditor.
Fast-Track Your ZF Green Electricity Verification
✓ No auditor search or onboarding
✓ We know ZF’s requirements inside out
✓ Streamlined setup → start and finish fast
✓ Pre-negotiated, below-market rates
Our Role as Your Green Electricity Auditor
justReporting is the official cooperation partner of ZF for supplier verifications under the Green Electricity Guideline.
Our work is built on three pillars:
Streamlined Setup
Pre-approved contracts and standardized templates enable an instant start and a consistent, efficient audit workflow.
Familiarity with
ZF requirements
Co-developed with ZF, we know the guideline inside out. Every technical and procedural detail for supplier compliance.
Fair Pricing, Full Value
All ZF suppliers benefit from centrally agreed audit rates — predictable, transparent, and fair.
Your Path to Compliance – ZF Verification Timeline 2025
Stay on track with ZF’s official Green Electricity verification schedule for the 2025 reporting year.
How ZF Green Electricity Verification Works
Different paths, one goal: verified renewable-energy use.
We help suppliers choose the most efficient verification route based on their energy setup.
Verification Approaches – Two Paths to ZF Compliance
Both options simplify your supplier verification while meeting ZF’s technical and assurance standards.
Based on ISRS 4400
- Exclusively performed by us
- Primarily based on document review, with scope agreed between ZF and the auditor.
- Lower external costs.
- Higher internal effort due to preparation and upload of all relevant electricity procurement documents.
- Not suitable for regulatory or third-party reporting purposes.
Based on ISSA 5000/ISAE 3000 (Revised)
- Based on interviews and data analysis.
- Auditor determines scope and methods.
- Higher external costs due to more audit effort.
- Some internal effort from interviews and data clarification.
- May be used for other reporting purposes if agreed in advance.
What We're Built On
justReporting combines Big-4 assurance expertise with a digital, entrepreneurial mindset — making ESG and energy reporting understandable, audit-ready, and actionable.
Frequently Asked Questions
- Proven ZF expertise – We co-authored the ZF Green Electricity Verification Guidance and therefore understand ZF’s assurance expectations and suppliers’
day-to-day realities.
- Fast onboarding – Contracts and workflows are pre-approved by our own Legal and Quality teams, so you can begin almost immediately with minimal administration.
- One-stop solution – No need to hunt for a qualified auditor or brief them on ZF specifics; we already “speak ZF” and can start straight away.
- Preferential pricing – All suppliers in the ZF network benefit from a centrally negotiated daily audit rate below market level, keeping your verification costs predictable.
Prepare the following evidence (exact items depend on how you purchase electricity):
- Meter readings or utility invoices showing consumption volumes
- Power-purchase or supply contracts indicating renewable-energy shares
- Energy Attribute Certificate retirements/cancellation statements
- Any additional proof listed in the ZF Green Electricity Supplier Guide
Collecting these documents in advance shortens the review phase significantly.
| Phase | Month | Key activities |
| Contract & kick-off | November | • Sign agreement • Choose verification pathway |
| Document preparation | December | • Compile initial evidence |
| Detailed review | January – February | • Submit full package • Verification |
| Completion | March | • Finalise procedures • Issue the assurance report |
No. We invoice only the actual audit hours at the discounted ZF rate. Total cost varies with scope, data quality and assurance depth.
| Verification Approach | Internal effort | Audit effort | |
ZF Supply-Chain Green Electricity Verification | Higher | Lower | |
| Limited-Assurance Audit | Lower | Higher |
No. To preserve independence, the engagement contract is solely between your company and our audit firm. ZF neither signs nor influences this agreement.
ZF only receives the final assurance certificate via the ZF SupplyOn Business Directory; our contract already authorises you to share it.
Your company covers the cost of the verification; ZF does not reimburse or co-finance the service.
If you choose to work with us, you benefit from a discounted audit rate negotiated specifically for ZF suppliers, and you save valuable time thanks to our fully aligned administrative and operational setup.
If you select another audit firm, you’ll need to manage onboarding, alignment with ZF requirements, and contracting on your own — and market rates are typically 15–20% higher than those offered through us.
Book your free initial consultation. We will clarify your status (Recommendation vs. Minimum) and define the most efficient audit path for you together.
Meeting the deadline is part of your commitment to ZF. In case of non-compliance, ZF reserves the right to take contractual measures. Our streamlined process is designed to ensure your timely submission.
At the end of the process, you will receive the audit report from us. You must also fill out the 'ZF Supplier GE Declaration'.You will then upload both of these documents to the 'Green Electricity Roadmap' section of the ZF SupplyOn Business Directory.
Yes, we provide comprehensive ESG and sustainability verification services. We can discuss your specific needs during the booking process or feel free to explore our full service offerings at https://justreporting.eu
We perform our services in German or English.
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If you would like to work with us or just want to get in touch, we’d love to hear from you!
