Carbon Management

Mar 27, 2026

Carbon Management for Multi-Entity Groups: From Scattered Data to One Source of Truth

Your group has 50 subsidiaries. Each uses a different ERP, stores invoices in a different format, and reports data on a different timeline. Getting a single, consistent carbon number across all of them? That is the real carbon management challenge for multi-entity groups.

17+ERP systems in a single
group (real customer example)

Monthsto consolidate carbon data
across subsidiaries manually

~80%of carbon data still collected
via spreadsheets and email

Fabian Merup

Writer

Mattias Nad

Research Analyst

What is carbon management?

Carbon management is the systematic process of measuring, consolidating, and reducing greenhouse gas emissions across an organization. This article focuses on corporate carbon management for Scope 1, 2, and 3 reporting, not carbon capture and storage (CCS/CCUS) or government climate policy.

In most multi-entity groups the sustainability team surfaces the data gap first; group finance still needs one consolidated footprint that survives limited assurance. Industry matters less than structure: many subsidiaries, many ERPs, one reporting boundary.

A Nordic engineering group with 50+ subsidiaries told us something that stuck: “What we're struggling with when it comes to reporting is just to get the data. It's an enormous amount of data. It's quite immature processes.” That struggle, getting consistent carbon data from dozens of decentralized entities, is the defining problem of carbon management for multi-entity groups.

Carbon management for multi-entity groups is the systematic work of measuring, consolidating, and reporting Scope 1-3 emissions across subsidiaries so the parent can meet CSRD with one auditable group view built on high-quality carbon data. The core challenge is not calculation: it is data collection from subsidiaries with different ERPs, formats, and levels of digital maturity.

For groups with dozens to hundreds of subsidiaries (we regularly speak with groups ranging from 12 to 650+ entities), the work is not only consolidation but action: entity-level visibility, category and supplier signals, and reduction levers you can execute without drowning the organization in administration.

Why carbon management is different for multi-entity groups

Carbon management at group scale is different because complexity multiplies with every subsidiary, ERP, country boundary, and language, long before anyone debates emission factors.

HOW COMPLEX IS YOUR GROUP?

Adjust the numbers to match your group. The point is not the exact product. It is that complexity compounds at every layer.

companies

ERP systems

countries

languages

4,800 data paths to consolidate

“This can become a monster, I'm telling you. How can one get good at this work and be able to show improvements without administering ourselves to death?”

Group sustainability lead, 50-company Nordic industrial group

How groups manage carbon data today

Today, most groups live in a painful loop: manual collection from subsidiaries, inconsistent formats, heroic spreadsheet consolidation, and a final report that is already out of date before it ships.

The consolidation problem

The core issue is not calculation. It is data collection. Getting invoice data from 200 subsidiaries, each with its own system, controller, and priorities, is an organizational challenge before it is a technical one.

"A significant pain point is the manual consolidation work required from controllers at the mills to create group-level reports."

Forest industry group CFO

FINANCE VS CARBON GAP

Use the tabs to compare financial versus carbon reporting. This gap is the day-to-day reality for most group sustainability teams.

DimensionFinancialCarbon

Data collectionAutomated from ERPManual emails and spreadsheets

ConsolidationStandardized across entitiesDifferent formats per subsidiary

Drill-downEntity, cost center, GL accountGroup-level totals only

Audit readinessAssurance-grade trailNo traceable path from source to total

Time to closeDays after period endMonths of chasing subsidiaries

“What we're struggling with when it comes to reporting is just to get the data. It's an enormous amount of data. It's quite immature processes.”

CFO, Nordic engineering group (50+ subsidiaries)

The 5 structural challenges for multi-entity groups

These five challenges show up in most industrial holdings. Carbon management breaks when any one is ignored.

Decentralized ERP systems

Every subsidiary runs its own system.

Inconsistent methodologies

Some use spend-based, some activity-based, some nothing.

Paper and binders still exist

Small entities haven't digitized.

Multi-country complexity

German HQ, Swedish ops, Finnish factories.

Stale data from manual collection

Financial data flows continuously; carbon data is rebuilt in an annual scramble.

"That's positive from a contact point perspective. Because that's usually the challenge when we talk to customers. They have 17 purchasing systems or 17 ERP systems, which makes it harder to automate this type of calculation."

Big 4 climate advisory

“We have no central ERP. All companies have their own. We have 12 companies in Denmark, all have a CEO, a CFO, their own system. So you would have to export from a lot of companies.”

Group CFO, Nordic industrial group (decentralized M&A)

BEFORE / AFTER FLOW

●Emails and ad-hoc file drops from subsidiaries

↓

●Manual uploads and one-off templates

↓

●Inconsistent units and hidden assumptions

↓

●Annual scramble to hit the disclosure deadline

↓

●Report with gaps and weak audit trail

What to look for in carbon management software

Carbon management software for a multi-entity group should be judged on whether it produces high-quality carbon data (traceable, activity-based where it matters, consistent across entities), not on generic dashboards.

CRITERIA

Works with any ERP (your 200 entities don't all use SAP)

If deployment requires a bespoke integration per subsidiary, you will never cover the long tail of small entities. The right system meets each company where its financial data already lives.

Invoice-level ingestion, not survey-level

You cannot survey 50 subsidiary CFOs quarterly and expect accuracy back. Source documents beat self-reported estimates every time, especially under limited assurance. Systems that use AI to extract line items from invoices and PDFs, with minimal manual entry, scale that discipline across hundreds of entities. That same line-level approach is what makes a defensible product carbon footprint possible when you need product-level granularity, not only group totals.

Consistent methodology across entities

Comparing spend-based Entity A with activity-based Entity B is meaningless. Central governance of methodology is what makes group totals defensible.

Audit trail per calculation for CSRD

Limited assurance requires traceability from reported tons back to factors and source transactions. If you cannot show the path for a single entity, you cannot show it for the group.

Drill-down by entity, category, supplier

Group-level averages hide the subsidiaries and suppliers that drive the footprint. Reduction work happens where the transactions are, not at the holding company PowerPoint slide.

What CSRD requires from group-level carbon reporting

CSRD expects group-level climate disclosures that survive limited assurance: ESRS E1 emissions must consolidate across entities with documented methodology, not incompatible local spreadsheets.

ESRS E1 and group consolidation

ESRS E1 covers energy and gross Scope 1-3 emissions (see 15 Scope 3 categories) and calculation methods. Groups need consistent boundaries, documented factors, and audit trails from transactions to tons for each material entity.

REGULATORY TIMELINE

2026

Second wave brings medium undertakings and more group subsidiaries into scope. You are here.

CSRDEUR-Lex Directive 2022/2464: Corporate Sustainability Reporting\u2197 ESRS E1EFRAG Climate Change Disclosure Standard\u2197 GHG ProtocolCorporate Value Chain (Scope 3) Accounting and Reporting Standard\u2197 SBTiScience Based Targets Corporate Net-Zero Standard\u2197 VerdantixGreen Quadrant and market benchmarks for carbon and EHS software\u2197

From carbon reporting to carbon reduction

The payoff from serious carbon management is not a thicker PDF: data precise enough to steer procurement, operations, and capital across the group.

“The other part of it that is more interesting to get at is how we actually reduce our emissions for real.”

Sustainability director, Nordic technology consulting group

At entity-level resolution, carbon data reveals operational reality: expensive carbon-heavy suppliers, energy intensity outliers, categories where cost and tons fall together.

You do not reduce what you cannot see. Spreadsheet consolidation hides resolution; automated entity-level ingestion makes data actionable for procurement and operations.

One group customer moved from a months-long annual scramble to continuous data across 50+ subsidiaries on one pipeline, any ERP.

Product carbon footprintHow to calculate PCF at transaction level with activity-based data.15 Scope 3 categoriesWhat each category covers and where footprint concentrates in complex groups.

Frequently asked questions about carbon management

Carbon management is measuring, consolidating, and reducing greenhouse gas emissions. For multi-entity groups it means collecting data from subsidiaries, standardizing methodology, and using the dataset for procurement and operations.

Carbon management software automates collection, calculation, and reporting. For groups, prioritize multi-ERP and invoice-level ingestion, consistent activity-based methodology, entity drill-down, and audit-ready outputs under CSRD assurance.

Most groups combine manual collection, spend-based estimates, and spreadsheet consolidation, often limiting reporting to once per year. Advanced groups move to automated invoice ingestion with consistent methodology across entities.

Under CSRD and ESRS E1, consolidated disclosures must survive limited assurance and later may face reasonable assurance. Auditors test consistent category definitions, factor hierarchy, and consolidation boundaries. Mixed spreadsheets fail those tests even when totals look fine.

CSRD sets annual disclosure. Many groups align a monthly or quarterly carbon close with finance (e.g. files by BD10 after month-end) so controllers are not double-booked. Sustainable frequency is limited by ingestion and master data, not slide deadlines.

Defensible CSRD reporting, procurement levers when rollups are clean, clearer bank and insurer conversations, and internal steering (shadow pricing, charges, capital packs) without rebuilding the model yearly.

Carbon accounting is quantifying emissions with GHG Protocol categories. Management adds governance over methodology, onboarding, M&A, and targets. Consultants can help baseline; you still need an internal owner for master data and sign-off or the model drifts when the project team leaves.

See how Bardo handles multi-entity carbon data

Book a demo. See how your subsidiaries' financial data becomes consolidated, audit-ready carbon reporting.

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See how your data performs in a quick CSRD check

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