Emission factors in the GCC: DEFRA vs IEA vs local utility factors (and how to govern them)

Emission factors can change your reported footprint even when operations stay the same, especially in electricity-heavy GCC businesses. The safest approach is to prioritize the most geographically representative factors available (utility/subnational for Scope 2 where possible), use IEA as a consistent fallback for multi-country portfolios, and use UK DESNZ conversion factors mainly for travel and fuels, then freeze factors by reporting year with a change log so results stay reproducible under assurance.
Primary references: UK Government (DESNZ) conversion factors for company reporting, IEA emissions factors dataset, and the GHG Protocol Scope 2 Guidance.

Key takeaways:

Use the most representative electricity factor available (utility/subnational first), and document why.
Treat emission factors like controlled data: versioning, “closed years,” audit logs, and change notes.
Avoid “factor drift” (different entities silently using different sources/years).
Report Scope 2 location-based and market-based where relevant, and keep factor evidence aligned to each.
CBAM and assurance pressure make factor governance a finance-grade control, not a sustainability preference.

Why emission factors become a governance issue in the GCC

If a board member asks, “Why did our emissions go up when nothing changed?”, the answer is often not operational. It’s a factor change.

In the GCC, that risk compounds because many groups operate across:

multiple entities and utilities,
multiple countries,
multiple reporting pressures (e.g., CBAM, IFRS S2-style disclosures, exchange guidance, lender questionnaires).

A single swap in Scope 2 electricity or business travel factors can ripple through totals, intensity metrics, targets, and year-on-year narratives.

Definition (keep this consistent):
An emission factor is a coefficient used to convert activity data (e.g., kWh, litres, passenger-km) into emissions (e.g., kg CO₂e). It’s the “conversion rule” behind your calculated footprint.

The common failure mode: “factor drift”

Factor drift \= when different parts of the organization use different factor sources, years, boundaries, or units (often unintentionally), and the group can no longer reproduce last year’s numbers exactly.

Typical examples:

One business unit uses a local utility factor for electricity.
Another uses IEA national factors.
A third uses a database/API that updates silently.

Result: totals don’t reconcile, assurance becomes painful, and year-on-year changes are hard to explain.

If you want the broader foundation first, see: Introduction to carbon accounting protocols

DEFRA/DESNZ vs IEA vs local GCC factors: what to use when

UK Government conversion factors (often called “DEFRA factors”)

What many teams call “DEFRA factors” are the UK Government’s conversion factors for company reporting, now published under DESNZ and updated annually.

Where they work well for GCC teams:

Business travel (air, rail, car), fleet fuels, and common categories needing a consistent default set
When you need broad coverage across activity types with a clear annual update cadence

Where they can mislead in the GCC:

Electricity (Scope 2) if you use UK grid factors as a proxy for GCC grids
Any category where local conditions materially differ (grid mix, desalination intensity, waste routes, fuel specs)

How to use them responsibly outside the UK:

Treat it as a representativeness judgement and document why it is acceptable for your activity/geography.

IEA Emissions Factors (electricity/heat by country)

The IEA Emissions Factors dataset provides annual country-level emission factors for electricity and heat generation.

Where IEA works well for GCC teams:

Multi-country footprints needing one consistent methodology for location-based Scope 2
Portfolio reporting across GCC + EU + Asia where comparability matters

Where IEA is not enough:

When you need utility-level or emirate-level representativeness (operational reality differs by utility and network)
When assurance expectations require “best available geographically representative” factors

Local utility / national sources (often best for representativeness)

For Scope 2 electricity in particular, local utility factors are often the most geographically representative when they exist and are credible.

Example (Dubai): DEWA’s Sustainability Report 2023 includes a 2023 grid emission factor/carbon intensity figure for its electricity. Source: DEWA Sustainability Report 2023 PDF

Real-world adoption example: Salik’s sustainability reporting references DEWA’s grid emission factor for Scope 2 electricity and UK Government conversion factors for certain Scope 1 categories.

A GCC decision tree for choosing electricity factors (Scope 2)

Use this “answerable-by-auditors” hierarchy for location-based Scope 2 electricity:

Utility/subnational factor exists and is credible (e.g., utility territory, emirate-level)
→ Use it. Save the report/PDF and record the exact version/year.
If not, national grid factor is published by an authoritative source
→ Use it. Record assumptions and year.
If not, IEA country factor
→ Use it as a consistent global fallback. Record the dataset release and year.
Last resort: conservative proxy
→ Document it as a proxy, justify why it’s the best available, and set a plan to replace it.

This hierarchy is aligned with a simple principle: representativeness first, consistency second, proxy last.

Scope 2 reporting: location-based vs market-based (and why it affects factor choice)

Scope 2 is where factor decisions get scrutinized the most.

Location-based Scope 2 reflects grid-average emissions intensity where consumption occurs.
Market-based Scope 2 reflects emissions based on contractual instruments (e.g., supplier-specific products, certificates) when valid and available.

GHG Protocol Scope 2 Guidance is the key reference for these concepts.

GCC-specific implications:

Many groups purchase certificates/instruments across multiple markets (availability and rules vary).
Large-customer electricity arrangements differ by country and utility.
If you claim market-based reductions, you need evidence and traceability aligned to the instruments—not just a grid factor.

For operational boundaries and mapping support, see: Scope 1, 2, and 3 mapping

Run emission factors like governed data (not spreadsheet cells)

1) Write a factor selection policy (per category)

Document a hierarchy for each category (electricity, fuels, travel, water, waste, refrigerants). Keep it short and enforceable.

For Scope 1 stationary combustion, the IPCC 2006 Guidelines explain the concept of moving from default factors toward more specific approaches where feasible.

2) Maintain a controlled factor library (minimum fields)

Your factor library should include:

Factor ID (unique)
Activity type + unit (kWh, litres, passenger-km)
Scope + category mapping
Geography (country / emirate / utility territory)
Source link + source document name
Version + “valid from / valid to”
Boundary notes (combustion-only vs lifecycle; TTW vs WTT vs WTW)

3) Versioning rules that prevent surprises

Adopt three rules:

Rule A: Freeze factors per reporting year (“closed year”).
If FY2025 is closed, the factor set used for FY2025 is locked.

Rule B: Any change requires a change note.
What changed, why, and the quantified impact on totals and intensity metrics.

Rule C: Restate only with a policy.
If you restate prior years for comparability, do it explicitly and explain the delta.

4) Produce a one-page “factor memo” per reporting year

Include:

Sources used (linked)
Selection logic
Boundary choices
Known limitations + next improvements

This is often what auditors and internal assurance teams actually want.

5) Lightweight change control workflow (but real)

Request update (reason + source)
Validate units/geography/boundaries
Run impact analysis (last quarter + last year)
Approve (Finance + Sustainability, or accountable owners)
Apply from an effective date
Log + notify stakeholders

Worked example: a Dubai + KSA group preventing factor drift

Scenario: A group has:

Dubai HQ + facilities billed by DEWA
KSA operations across multiple sites
Frequent travel across GCC and Europe

A defensible setup:

Dubai electricity (location-based): use DEWA’s published factor for the relevant year; record the exact report and page reference in your factor memo. Source: DEWA Sustainability Report 2023 (PDF)
KSA electricity (location-based): use the best available authoritative national/utility factor; if utility-level is not published in a usable way, use IEA’s country factor as the documented fallback. Source: IEA Emissions Factors dataset
Travel: use UK DESNZ conversion factors (air/rail/car) for consistent coverage across categories and years. Source: UK Government conversion factors 2025

Governance controls:

Lock FY2025 factors at year close.
Any change in FY2026 must include an impact note (e.g., “Switch from proxy to utility factor reduced reported Scope 2 by X% for Dubai sites”).

This is how you keep the narrative stable: changes become explainable events, not mysteries.

What’s changing in 2025-2026 (and why governance matters more, not less)

1) GHG Protocol Scope 2 guidance updates are in motion

GHG Protocol ran public consultations on Scope 2/Electricity topics (consultation now closed). Even before formal updates are issued, expectations are moving toward clearer evidence and stricter application of Scope 2 methods.

2) Electricity factors are trending toward more granularity

IEA is also exploring more time-sensitive approaches (e.g., real-time emissions factors in test contexts), which increases the need for strong versioning and reproducibility.

3) CBAM moves from reporting toward cost exposure

CBAM’s transitional phase (2023–2025) precedes its definitive implementation pathway, and data quality/assumptions can translate into real cost and compliance risk.

If CBAM is relevant to your supply chain, the practical message is simple: weak factors and weak documentation have consequences.

For GCC policy context, see our blog on COP outcomes

Copy/paste checklist: implement factor governance in 4 weeks

Week 1: Decide and document

Define factor hierarchy per category (electricity, fuels, travel, water, waste, refrigerants)
Define approved source list (utility/subnational first for GCC electricity where available; IEA fallback; DESNZ for travel/fuels)
Confirm Scope 2 approach (location-based required; market-based where valid instruments exist)

Week 2: Build the library

Create controlled factor table (IDs, versions, validity dates, links, boundary notes)
Map each factor to the activity fields you collect

Week 3: Enforce versioning

Lock the FY2025 factor set (“closed year”)
Create a change log template
Write restatement rules (when you will / won’t restate)

Week 4: Operationalize change control

Add approval and impact analysis steps
Set quarterly review cadence (not ad hoc edits)
Require “factor memo” sign-off at year close

If you want to operationalize this with evidence management and audit-ready controls, see:

FAQ

Are UK (DESNZ/“DEFRA”) conversion factors acceptable for GCC reporting?

Often yes for travel, fuels, and common activity categories when you need a consistent, well-documented default set. Because these factors are designed for UK company reporting, using them in GCC reporting should be documented as a representativeness judgement, including why local factors were not used where relevant. Source: GHG Reporting

Should IEA replace local GCC grid factors for Scope 2 electricity?

Usually no. Local utility/subnational factors are often more geographically representative when available. IEA is best positioned as a consistent fallback when local factors are unavailable or not usable for your reporting needs.

Do we need both location-based and market-based Scope 2?

Location-based reflects grid-average emissions intensity and is the baseline view. Market-based becomes important when you have valid contractual instruments or supplier-specific products and you are making claims based on them.
Source: GHG Protocol

How often should we update emission factors?

Most organizations update on an annual reporting-year cycle, then freeze the set once the year closes. Update more frequently only if decision-use requires it and if you do, strengthen version control, audit logs, and reproducibility.
(Recommended practice aligned to governance needs; always document the chosen cadence and rationale.)

The bottom line

In the GCC, emission factors are not “just inputs.” They are part of your credibility.

When you govern factors properly, you get:

Comparable year-on-year reporting
Faster assurance and fewer audit questions
Stronger CBAM, tender, and financing readiness
A reduction story stakeholders trust

If you want a copy of a factor governance template (policy + change log + factor library fields), we can share one, and show how teams operationalize this approach in Coral.
Book a demo and get started.

Emission factors in the GCC: DEFRA vs IEA vs local utility factors (and how to govern them)