Consolidating sustainability: much more than adding up tonnes of CO₂
A consolidator knows it well: consolidating is never just adding up. Before even looking at the result, several questions arise — about scope, about double counting, about variances. Financial consolidation has solved these questions long ago. Sustainability is rediscovering their importance every day. Second instalment of the mini-series on what extra-financial reporting can learn from the consolidator's mindset.
Scope: build on the same foundations, but not mechanically
The first question any consolidator asks is simple: what scope am I consolidating? The same question arises on the sustainability side — but the answers don't overlap exactly with the financial scope.
Financial consolidation scope — subsidiaries (IFRS 10)
Core criterion: control over relevant activities and decisions — power, exposure to variable returns, ability to affect those returns. Not just an ownership criterion.
CSRD / ESRS scope (Scope 1 & 2)
Base: financial consolidation scope. Extension: assets, sites and entities under operational control but outside accounting consolidation — to be reported separately (ESRS E1).
Scope 3 — Value chain
Suppliers, customers, product use, end-of-life… A value-chain logic entirely distinct from financial consolidation. No direct equivalent in IFRS.
and document the sustainability-specific extensions — especially for Scopes 1 & 2.
The three GHG scopes: what we measure, and where
Each scope has a different relationship with the financial perimeter. That's what makes ESG consolidation rich — and complex.
| Scope | What it covers | Relation to financial scope |
|---|---|---|
| Scope 1 Direct emissions |
On-site combustion, industrial processes, fleet vehicles. ESRS E1 scope: consolidated group + sites, assets and entities under operational control. | ✓ Strong convergence with financial scope |
| Scope 2 Purchased energy |
Electricity, heat, steam consumed but produced by a third party. Same scope as Scope 1 — with specifics linked to energy attributes and intra-group flows. | ✓ Strong convergence — purchased energy specifics |
| Scope 3 Value chain |
Purchases, transport, product use, end-of-life, financial investments… Indirect emissions outside Scopes 1 and 2. Estimation methods, external sources. | ⚠ Value-chain logic — largely distinct scope |
Same underlying reasoning, but boundaries and methods that don't mechanically overlap with the financial scope.
Careful: consolidating ≠ adding up (the intra-group electricity example)
Here's a concrete example of why simple addition isn't enough. Imagine two subsidiaries of the same Group: A produces electricity and sells it to B.
Financial treatment
- A records an intercompany revenue
- B records an intercompany expense
- ↓ Consolidation: systematic elimination, revenue and expense cancel out. A single, codified rule.
GHG treatment
- A produces electricity → direct emissions in Scope 1
- B consumes this electricity produced within the Group
- ⚠ Risk: counting the same physical emissions twice in the Group inventory. Must define who accounts for it, in which scope, and eliminate double counting.
The reflex is the same — identify internal flows and prevent double counting. But on the sustainability side, there's no single automatic rule: every internal flow must be given explicit GHG treatment.
-8% CO₂: performance or not? Variance analysis as a management tool
Is an 8% emissions drop a performance? Not necessarily. A number without variance analysis isn't yet a management tool — it's just a number. Financial consolidation developed long ago a variance analysis grid that sustainability can reuse as-is.
Operational performance
Real decarbonisation: fewer emissions at constant activity. The only effect that reflects genuine improvement.
Activity decline
Volume effect. Less production = fewer emissions, with no particular effort. Careful not to confuse the two.
Divestment / acquisition
Scope effect. Selling a polluting business mechanically reduces emissions. Must be isolated.
Methodological change
Method effect. A new emission factor, a new scope definition changes the figure without changing reality.
New emission factor
Factor effect. Databases (ADEME, GHG Protocol) evolve. The same kWh may see its intensity change.
Mix change
Mix effect — for example, more produced on a less carbon-intensive site. Real, but not always repeatable.
variance analysis matters as much as the number itself.
From reporting to steering: bringing Finance & Sustainability closer
This is when we start moving from sustainability reporting to true performance management. Two concrete examples illustrate this rapprochement.
Example 1 — Investments: accounting CAPEX ↔ Taxonomy CAPEX ↔ tCO₂e avoided
An investment can be tracked from three complementary angles:
- Accounting CAPEX: what Finance has historically tracked
- EU Taxonomy eligible / aligned CAPEX: the ESG regulatory reading
- tCO₂e avoided: the actual carbon impact of the investment
Careful: Taxonomy CAPEX ≠ decarbonisation investments. These are two distinct logics that must be identified, reconciled and tracked separately.
Example 2 — Activity: volumes, revenue/margin, energy, CO₂ emissions in one dashboard
When we put volume, financial and environmental indicators side by side, we start seeing the real activity performance. A 10% revenue growth with 12% MWh growth and 15% emissions growth is not the same performance as growth at constant or declining intensity.
Don't lose the traceability of green investments
A typical problem when Finance and Sustainability operate in silos: decarbonisation investments validated in strategic committees get lost in the standard ERP pipeline, and it becomes impossible to track the tCO₂e actually avoided.
Strategy
Decarbonisation trajectory, ambition, objectives by pillar.
Levers & projects
Project identification, emission pockets, prioritisation.
Business case
Finance + Sustainability: ROI, NPV, payback + tCO₂e avoided, Taxonomy eligibility.
ERP accounting
Standard CAPEX. Risk: loss of the project identifier or sustainability attributes at accounting stage.
Tracking
Financial ✓ actual vs budget CAPEX · Extra-financial ✗ actual tCO₂e hard to retrieve. Taxonomy reconciliation complex and manual.
attached at validation, tracked throughout the life cycle.
Concretely: same project code in decision bodies AND in accounting / consolidation tools. Sustainability attributes (decarbonising yes/no, Taxonomy eligibility and alignment, environmental objective, planned tCO₂e) attached from initial validation, carried through to actuals.
Coming next — Episode 3: Integrate & steer
Collect ✓ Control ✓ Consolidate ✓ Analyse ✓ Then one essential question remains: do we really need to build two parallel processes and systems to achieve this? That's the topic of the third and final episode.
Structure your sustainability consolidation with the consolidator's reflexes
Scope, double counting, variance analysis, Finance-Sustainability reconciliation: I help you intelligently transpose these proven reflexes to your extra-financial reporting.
Let's discuss your project raul.noriega@tesode.com