KZR certification for biomass traders — what a supplier must hold in 2026

Why procurement asks about KZR first

For a Polish municipal heating plant, a KZR INiG certificate (National Certification System for Biofuels and Bioliquids) is not decorative — it is the formal basis without which a batch of biomass does not count toward the customer's renewable-energy target. Polish RES law requires biomass burned as renewable fuel to come from a sustainable source, documented in line with RED II (Directive 2018/2001).

A trader — a company like Green Fuel Trading, which does not produce raw material but aggregates it from dozens of producers — must hold its own KZR certificate as a trading operator. It is not enough for the certificate to sit with the producers we buy from. There must be an unbroken chain of custody from producer to trader to end user.

What the certification body actually checks

A KZR trader audit covers three areas:

1. Mass balance

This is the core. A trader must prove that a tonne of biomass leaving its warehouse with a KZR certificate corresponds to a tonne entering from a certified producer. Mass balance means:

• every incoming batch weighed on a certified scale and entered into the register
• every outgoing batch to a customer bearing an outgoing batch number, weight, declared calorific value and an assignment to a specific incoming batch (or several, if blended — then pro-rata)
• register maintained in an IT system (Excel with change history, dedicated application or ERP) with a full audit trail
• physical warehouse inventory matching the accounting balance at every point in time

The auditor spot-checks 3–5 batches from the past 12 months and traces them from purchase invoice through warehouse register to sales invoice and KZR certificate issued to the customer. If any document is missing, the whole chain breaks.

2. Evidence of sustainable origin

For woody biomass — origin must be from forests managed to sustainable-forestry principles (in Poland: PEFC or FSC certificates for the forest district), from wood-processing facilities (sawmill chips), or from wood waste.

For agri biomass (sunflower, PKS) — analogous: sustainable cultivation, no violation of protected areas, LULUCF limits, and evidence that the material does not come from land deforested after 1 January 2008.

The trader must hold, from every supplier, an origin declaration (in Poland: PZ form from state forests) or — for certified producers — the producer's own KZR certificate with a current scope.

3. GHG emissions calculation

The batch KZR certificate reports declared life-cycle emissions in kg CO2 eq / GJ of primary energy. The calculation must cover:

• cultivation or harvest emissions (fuel for forest harvesters, for example)
• transport emissions (from source to trader warehouse, then to customer)
• processing emissions (for pellet: electricity and heat for pelleting, and the source of that energy)
• credits for savings (where applicable — e.g., CO2 capture at processing)

RED II sets default values for biomass classes — a trader can use these defaults or calculate its own if own numbers are better (lower emissions). Lower declared emissions = higher RES-target share for the end customer.

Cost and duration

Preparing for a certification audit takes 2–4 months — implementing mass balance, training the team, gathering supplier documentation, running an internal pre-audit.

The certification audit itself is 3–5 days of auditor time at the trader's premises. First-issue certification cost — PLN 12–25 k net plus travel. The certificate is valid for 3 years, but a monitoring audit runs each year (2–3 days, PLN 8–15 k).

On top of that: mass-balance software (from Excel with change history for PLN 0 to dedicated SaaS at PLN 500–2 000 / month) and the internal owner of the system (at GFT — a dedicated ~40% FTE role, Quality Manager).

What a KZR batch from GFT actually looks like

Every delivery to your heating plant ships with a document pack:

• Batch KZR certificate — batch number, net weight, calorific value, declared GHG emissions in kg CO2 eq / GJ, origin (country, source), issue date, signature of the trader's responsible person
• RED II compliance declaration — for the customer calculating the RES share
• Certificate of origin — for wood: forest district or sawmill; for agri: country and cultivation type
• Accredited laboratory quality certificate — technical parameters (calorific value, ash, moisture, chlorides, sulphur, nitrogen, halogens)
• Certified weighing — protocol from loading and unloading scales

Everything as PDF and in our customer system, available before unloading. The customer can hand the pack directly to its RES accounting system without additional corrections.

What happens if a supplier does not have KZR

Short answer: no sales to a municipal heating plant funded from the RES target. Someone might buy the raw material for an industrial process (e.g., drying in the wood industry), but that market shrinks fast.

In practice, traders without KZR sell biomass 8–15% cheaper than certified ones. This is the price of entry into the Polish district-heating market.

Six questions to ask a supplier before the first order

• Do they hold a current KZR trader certificate? (Not: certificates of producers they buy from.)
• What is the certificate number and expiry date? (Verify in the KZR INiG register.)
• What is the scope — all biomass types in the portfolio, or only some?
• How does mass balance work? (A trader can describe it in five sentences.)
• What are typical declared GHG emissions per batch — default values or own calculations?
• Will they deliver the full document pack before unloading, or only afterward?

Six questions that save your procurement team plenty of pain in the next RES audit cycle.

FAQ

Is PEFC/FSC the same as KZR? No. PEFC and FSC are sustainable-forestry certificates (at the forest-district or forest level). KZR is a chain-of-custody certificate for biofuel and biomass operators — producer, trader and end user. KZR requires wood to come from PEFC/FSC forests (or from a sawmill, as a processing entity), but PEFC/FSC alone does not replace KZR in the chain.

Can imported PKS carry KZR certification? Yes — PKS from Indonesia, Malaysia and West Africa can carry KZR if the plantation or the palm-oil mill (from which PKS is a residue) sits in a recognised sustainability scheme (ISPO, RSPO — both recognised in KZR). PKS imports without KZR do not count toward the RES target.

How long is a batch KZR certificate valid? A batch certificate has no expiry — it documents a historical fact (batch of these parameters shipped on this date). The operator (trader) certificate is valid three years and must be renewed.

Is KZR documentation a trade secret? No. The end customer has the right to the full document pack for every batch. GHG emissions, origin and technical parameters are required to calculate the RES share at the heating-plant side.

Summary

KZR certification for a biomass trader is not a nice-to-have — it is the condition of entry into the Polish district-heating market. Without it, sales to a municipal heating plant funded from the RES target practically do not exist.

Green Fuel Trading operates with KZR certification from the first delivery. Every batch leaving our warehouse carries the full document pack before unloading — KZR certificate, RED II declaration, laboratory certificate, certified weighing. The end customer receives everything as PDF and in our customer system, in a format that goes straight into RES accounting.

If your procurement team has a question about KZR — write to the GFT team. We will prepare a certificate excerpt and a history of the last five batches for a similar installation, so procurement can see how a complete chain of custody works in practice.