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Scope 1, 2 and 3 Emissions: What They Mean and How Australian Businesses Calculate Them

Scope 1, 2 and 3 Emissions: What They Mean and How Australian Businesses Calculate Them

Published: March 2026 | Updated: March 2026

Understanding your organisation’s greenhouse gas (GHG) emissions is foundational to environmental ESG strategy and regulatory compliance in Australia. The environmental impact pillar of ESG requires organisations to measure, report and act on emissions across three distinct scopes—a framework mandated by Australian Accounting Standards (AASB S2) for listed companies and increasingly expected by investors, regulators and stakeholders.

This article explains the GHG Protocol’s three-scope framework: what each scope encompasses, why the distinctions matter, how to calculate them using Australian methodologies, and how they align with your ESG strategy. Whether you’re preparing for AASB S2 disclosure, meeting Safeguard Mechanism reporting requirements, or building your net zero roadmap, this practical guide will help your organisation classify and quantify its carbon footprint accurately.

The Three-Scope Framework: An Overview

The Greenhouse Gas (GHG) Protocol, developed by the World Resources Institute and the World Business Council for Sustainable Development, defines three scopes of emissions:

  • Scope 1 (Direct Emissions): Greenhouse gases produced directly by your organisation
  • Scope 2 (Indirect Emissions): Emissions from purchased electricity, steam, heating and cooling
  • Scope 3 (Indirect Emissions): All other indirect emissions across your value chain

This three-part framework allows organisations to identify where emissions arise, understand their relative significance, and prioritise reduction strategies. For Australian businesses, AASB S2 mandates disclosure of Scope 1 and 2 emissions for climate-related financial disclosures, with Scope 3 recommended where material.

Scope 1 Emissions: Direct Emissions Your Organisation Controls

What Counts as Scope 1

Scope 1 encompasses all direct emissions produced by equipment and processes your organisation owns or controls. In the Australian context, this typically includes:

  • Fuel combustion: Natural gas in boilers, heating systems, or cooking facilities
  • Transport emissions: Company vehicles, fleet operations, and private vehicles used for business purposes
  • Manufacturing and processing: Chemical reactions, emissions from production lines
  • Refrigerant and fugitive emissions: Leakage from air conditioning, refrigeration, or pressurised systems
  • Land and waste decomposition: Landfill gas, wastewater treatment

The key distinction: if your organisation directly owns or operates the equipment emitting the gas, it’s Scope 1.

How to Calculate Scope 1 Emissions

Scope 1 calculations follow the activity-based approach under the GHG Protocol. The formula is straightforward:

Emissions (tCO₂e) = Activity Data × Emission Factor

For Australian organisations, the National Greenhouse and Energy Reporting (NGER) Act requires eligible facilities to report Scope 1 and 2 emissions to the Clean Energy Regulator. NGER provides Australian-specific emission factors aligned with IPCC guidance.

Example: If your business operates a delivery fleet consuming 50,000 litres of petrol per year, you’d multiply 50,000 by the emission factor for petrol (approximately 2.31 tCO₂e per 1,000 litres for Australian contexts) to derive ~115 tCO₂e of Scope 1 emissions.

Data Collection for Scope 1

Effective Scope 1 measurement requires:

  • Fuel purchase records: Litres, cubic metres, or kilograms of fuel consumed
  • Fleet management systems: Mileage, fuel consumption data from vehicles
  • Maintenance and servicing records: Refrigerant top-ups, fugitive emission events
  • Energy bills: For gas consumption where applicable
  • Waste and wastewater data: Tonnage and treatment methods

Scope 2 Emissions: Electricity and Energy Purchases

What Counts as Scope 2

Scope 2 covers emissions from purchased electricity, steam, heating and cooling that your organisation consumes but doesn’t generate itself. In Australia, the largest source of Scope 2 emissions is typically purchased electricity from the grid, which varies in emissions intensity by state:

  • NSW: Grid dominated by coal and renewables; medium emissions intensity
  • Victoria: Historically coal-heavy; declining as renewables increase
  • Queensland: Significant coal generation; higher baseline intensity
  • South Australia: High renewable penetration; lower grid intensity
  • WA & Tasmania: Varied grid composition; regional variation

Scope 2 also includes purchased steam or chilled water from third-party providers, though this is less common in Australian commercial operations.

How to Calculate Scope 2 Emissions

Scope 2 uses the same formula as Scope 1, but requires state-specific grid emission factors published annually by the Clean Energy Regulator:

Emissions (tCO₂e) = Electricity Consumed (MWh or kWh) × Grid Emission Factor (tCO₂e/MWh)

The GHG Protocol distinguishes between two calculation approaches:

Location-Based Method: Uses the average emissions intensity of the electricity grid where your organisation operates. The Clean Energy Regulator publishes updated factors annually; for 2024, NSW grid factor was approximately 0.78 tCO₂e/MWh.

Market-Based Method: Reflects actual GHG intensity of electricity you’ve contractually purchased. If you purchase renewable energy through a PPA (Power Purchase Agreement) or subscribe to GreenPower, you use the emission factor associated with that renewable source (often zero or near-zero for wind, solar).

AASB S2 requires disclosure of both methods; market-based is often preferred for net zero strategies as it recognises your renewable energy commitment.

Data Collection for Scope 2

Collecting accurate Scope 2 data requires:

  • Electricity bills: Consumption in kWh or MWh, breakdown by tariff or meter
  • Grid emission factors: Downloaded annually from Clean Energy Regulator (www.cleanenergyregulator.gov.au)
  • Renewable energy documentation: PPA contracts, GreenPower certificates, renewable energy credits
  • Meter readings: Where bills don’t reflect actual consumption

Scope 3 Emissions: The Extended Value Chain

What Counts as Scope 3

Scope 3 captures all other indirect emissions across your value chain that result from your business activities but occur in sources you don’t own or control. The GHG Protocol defines 15 Scope 3 categories, which for most Australian businesses cluster around:

  • Upstream: Purchased goods and services, capital goods, fuel and energy-related activities
  • Operations: Business travel, employee commuting, waste disposal
  • Downstream: Transportation and distribution, use of sold products, end-of-life treatment

For many organisations—particularly retailers, manufacturers, and service providers—Scope 3 represents 70–95% of total emissions. Ignoring it understates your environmental impact and misses critical decarbonisation opportunities.

Scope 3 Calculation Challenges

Unlike Scope 1 and 2, which involve assets you control, Scope 3 requires estimation and supplier engagement:

  • Purchased goods and services: Requires supplier data or industry spend-based models
  • Business travel: Distance data multiplied by emission factors per km/mode
  • Employee commuting: Often estimated by survey and headcount
  • Product use phase: For manufacturers, requires modelling customer usage
  • End-of-life: Assumes waste treatment methods; requires assumptions about recycling rates

AASB S2 recommends Scope 3 disclosure where material; the Clean Energy Regulator provides Australian-specific guidance for facility-based reporters.

Scope 3 Calculation Methods

Three approaches exist, each with increasing precision:

Spend-Based Accounting: Multiply total spend on a category by an industry-average emission factor (emissions per dollar spent). Easiest for initial assessments but least precise.

Average Data: Use typical emission factors for your industry sector. Better than spend-based; suitable for mid-sized organisations.

Supplier-Specific Data: Collect actual emissions from suppliers or partners. Most accurate but resource-intensive. Many large Australian corporates now require suppliers to disclose emissions.

For more detail on Scope 3, see our dedicated guide on Scope 3 emissions reporting.

Australian Regulatory Framework: NGER and AASB S2

The National Greenhouse and Energy Reporting (NGER) Act

The NGER Act, administered by the Clean Energy Regulator, sets a mandatory reporting threshold: any facility emitting ≥25,000 tCO₂e per year must report Scope 1 and 2 emissions annually. This applies to direct operations; Scope 3 is not mandated under NGER, though recommended for comprehensive strategy.

The NGER Act provides standardised calculation methodologies and emission factors; these align closely with GHG Protocol but are tailored to Australian sources (e.g., Australian coal emission factors, grid intensity by state).

AASB S2: Mandatory Climate Disclosures

AASB S2 (issued 2022, effective from 1 January 2024 for some entities, phasing in through 2025–2027) requires listed entities and certain large unlisted entities to disclose:

  • Scope 1 and 2 emissions (absolute and intensity metrics)
  • Scope 3 where material
  • Climate-related financial risks and opportunities
  • Targets and progress towards net zero

AASB S2 requires both location-based and market-based Scope 2 figures, allowing stakeholders to understand your grid reliance and renewable energy strategy respectively.

Integrating Scope 1, 2 and 3 Into Your ESG Strategy

Calculating your three scopes is the foundation for strategic action:

  • Baseline and benchmark: Establish year-zero emissions; compare to peers using industry databases
  • Hotspot identification: Which scopes and activities drive your footprint? Prioritise high-impact reduction levers
  • Science-based targets: Set reduction targets aligned to Paris Agreement pathways (see our SBTi guide)
  • Roadmap development: Scope 1 typically targets fuel switch or electrification; Scope 2 targets renewable energy; Scope 3 targets supplier engagement and circular economy
  • Governance and monitoring: Assign ownership, establish data systems, verify quality

For many Australian organisations, the priority sequence is: (1) measure all three scopes, (2) reduce Scope 1 through fuel switch and electrification, (3) transition Scope 2 to 100% renewables, (4) engage suppliers and customers on Scope 3.

Frequently Asked Questions

Do all Australian businesses need to report Scope 3 emissions?

Not mandated by NGER unless your facility exceeds 25,000 tCO₂e (then Scope 1/2 only). However, AASB S2 recommends Scope 3 disclosure where material for listed entities. Investors increasingly expect Scope 3 given its often-dominant size. Best practice is to measure and assess materiality; report if material to stakeholders.

Can we use international emission factors if Australian ones aren’t available?

The Clean Energy Regulator provides Australian-specific factors for common activities. These are preferable for NGER compliance. IPCC factors (international) are acceptable where Australian factors don’t exist, but using Australian data improves accuracy for local context (grid intensity, fuel sources, transport modes).

Should renewable energy reduce our Scope 2 to zero?

Under the market-based method, yes—if you purchase renewable energy via PPA or GreenPower with appropriate vintage and tracking. However, location-based Scope 2 reflects the grid’s average intensity regardless of your renewable purchase. Both are reported; market-based shows your commitment; location-based shows grid progress. Neither approach permits “zero” claims without verified, additional renewable generation.

How often should we recalculate emissions?

At minimum, annually. This aligns with financial reporting cycles and regulatory requirements. Many organisations recalculate quarterly for internal management and annual reporting for external disclosure. As your business grows or operations change, reassess scope boundaries to avoid misclassification.

What’s the difference between tCO₂ and tCO₂e?

tCO₂ is carbon dioxide only. tCO₂e (CO₂ equivalent) accounts for other greenhouse gases (methane, nitrous oxide, fluorinated gases) converted to a common unit using Global Warming Potential (GWP) factors. All scope calculations use tCO₂e to capture total climate impact. Methane, for example, has a GWP of 28–34 over 100 years, so 1 tonne methane = ~30 tCO₂e.

How do we handle outsourced operations in scope boundaries?

Use the “financial control” or “operational control” approach. Financial control: if you own/control the entity financially, include its emissions as Scope 1. Operational control: if you operate it directly, include as Scope 1 regardless of ownership. Boundaries must be clearly documented and consistent year-on-year for valid trend analysis.

Take the Next Step in Your Environmental ESG Strategy

Understanding your Scope 1, 2 and 3 emissions is critical for AASB S2 compliance, stakeholder confidence and strategic net zero planning. Our ESG specialists help Australian organisations measure, validate and act on their emissions data with confidence.

Book a Free ESG Strategy Session and discover how your organisation can integrate emissions measurement into a credible net zero roadmap.