This informal CPD article, ‘Scope 2 in Focus: Practical Pathways for Smarter Energy Reporting and Decarbonization’ was provided by IFRS Lab, a leading ESG advisory and training institution committed to advancing sustainability.
In the journey toward carbon neutrality, organizations increasingly recognize that their emissions footprint cannot be limited to direct, on-site sources. To understand climate impact comprehensively, carbon accounting frameworks segment emissions into three categories known as Scope 1, Scope 2, and Scope 3. Scope 2 represents indirect emissions from purchased energy — electricity, steam, heating, or cooling that a company acquires from external suppliers. Because most businesses purchase energy to operate offices, factories, data centers, or retail locations, Scope 2 typically represents a substantial share of their GHG inventory.
Scope 2 emissions are crucial for two reasons. First, they are relatively easier to quantify compared to the full span of Scope 3. Energy bills or supplier invoices often provide the usage data required to estimate emissions. Second, Scope 2 provides a lever for change: by switching to lower-carbon energy sources, companies can make immediate impact. Yet this simplicity hides complexity: the energy mix, contractual arrangements, and accounting methods all influence how Scope 2 emissions are recognized, compared, and reduced.
Defining Scope 2 Emissions
Scope 2 emissions are indirect emissions generated outside the organizational boundary but incurred through the purchase of energy. That includes electricity, steam, heat, or cooling that is produced offsite and delivered through grids or centralized systems. A useful shorthand is: Scope 2 = “buy,” in contrast to Scope 1 (“own”) and Scope 3 (“value chain, upstream or downstream”).
Important clarifications:
- If your organization purchases district heating, chilled water, steam, or cooling from a supplier (not generated on-site), those emissions count as Scope 2.
- On-site generation from boilers, furnaces, or other fuel combustion falls under Scope 1, not Scope 2.
- The greenhouse gas impact of producing, transmitting, and distributing the purchased energy must be accounted for.
A formal standard for Scope 2 accounting is the GHG Protocol Scope 2 Guidance, which supplements the Corporate Accounting and Reporting Standard. This guidance clarifies how to treat contractual arrangements, quality criteria for energy certificates, and dual-reporting of emissions (both location-based and market-based) to enhance transparency and comparability [1].
The GHG Protocol Scope 2 Guidance was released after extensive stakeholder consultation involving utilities, corporate actors, NGOs, and regulators [2]. It was intended as the most significant update to how companies report indirect energy emissions since the Corporate Standard’s inception [3].
Setting Boundaries: Location-Based vs Market-Based Methods
One of the core complexities in Scope 2 accounting arises from the fact that energy consumption is embedded in broader supply systems. When you draw electricity from the grid, that energy is pooled with all generation sources. How then do you attribute emissions properly? The Scope 2 Guidance addresses this through dual reporting: companies must report under both a location-based method and a market-based method (if energy contracts or certificates are available) [4].
Location-Based Method
This method applies grid-average emissions factors based on the geographic region’s power mix. It reflects the average emission intensity (for example, kg CO₂e per kWh) of grid electricity consumption in that area. Some key features:
- It assumes any electricity you draw is supplied from the averaged local grid mix.
- It captures the regional generation characteristics, and changes in the grid’s carbon intensity over time.
- It does not account for your specific energy procurement contracts or renewable purchases.
Because location-based emissions depend on the grid’s generation mix, firms in heavily fossil-fuel grids will report much higher Scope 2 than those in greener grids.
Market-Based Method
The market-based method allows organizations to reflect contractual agreements or instruments that specify emission attributes of their energy purchase — for instance, renewable energy contracts, supplier-specific emission rates, or energy attribute certificates. If a company can provide evidence that it has purchased or contracted low-carbon energy, then that lower emission factor can substitute for the grid average.
However, the market-based approach has rules. The contracts or certificates must satisfy Scope 2 Quality Criteria set by the GHG Protocol: attributes such as being generated at the same vintage year, traceability, retirement of certificates, and not double-counting emissions.
Companies that operate across multiple jurisdictions or grids must apply the appropriate method in each region where contractual instruments are available, then present dual results (location-based + market-based) with clear labeling.
These two methods can produce vastly different outcomes. One study showed heterogeneous reporting practices, where companies often emphasize the more favorable market-based results [5]. Another commentary compared the methods and called for harmonized standards to manage divergence [6].
Data Collection and Emissions Calculation
Scope 2 is often considered among the “easier” emissions to quantify, but proper methodology is still required. The steps include:
Gathering Activity Data
- Collect electricity usage from utility bills (in kWh or MWh).
- For steam, heat, or cooling, obtain volume and supplier data, and understand how those utilities are generated (fuel type, efficiency).
- For leased properties or shared services, determine control approach (e.g. capital leases) to define whether purchased energy is your reporting responsibility.
Choose the Right Emission Factors
- For location-based, use grid-average emission factors drawn from authoritative sources (national or regional grid agencies).
- For market-based, use emission factors tied to the contractual instrument (e.g. supplier renewable tariff, PPA) or certificate scheme.
GHG Protocol offers guidance on matching factors precisely to energy consumption, and how to treat cases where contractual factors do not meet quality criteria.
Emission Calculation
The basic formula is:
Scope 2 Emissions (tonnes CO₂e) = Energy Consumed (kWh) × Emission Factor (kg or t CO₂e/kWh)
If multiple electricity sources or different contracts apply, sum each portion separately. Always keep consistency in units and boundary definitions. When available, include emissions from steam, heat, and cooling similarly.
Reporting, Disclosures, and Assurance
Companies must clearly disclose which method(s) they used (location-based, market-based, or both), and the details of contractual instruments used under market-based accounting. If setting reduction targets, firms must clarify whether the target is based on the location-based or market-based emissions baseline.
Additionally, they should disclose base year recalculation policies, residual mix use, and any retirements or transfers of certificates. Independent assurance (audit) of emissions data is increasingly adopted to validate disclosures.
RECs (Renewable Energy Certificates)
Renewable Energy, Certificates, and Market Claims
One of the most debated topics in Scope 2 accounting is how and when companies can claim emissions reductions through renewable energy procurement instruments like RECs (Renewable Energy Certificates), energy attribute certificates, or PPAs (Power Purchase Agreements). While these can enable favorable reporting under the market-based method, they come with caveats.
Certificate-Based Claims and Limits
Under the current Scope 2 Guidance, a company may purchase EACs (e.g. RECs, Guarantees of Origin) to replace the grid-average factor with a lower, contract-backed emission factor — but only if the certificate meets Scope 2 Quality Criteria.
A critique in recent research points out that many certificates may not drive additional renewable generation, giving rise to concerns over claim integrity [7].
Some corporate buyers have effectively claimed “zero Scope 2” through RECs even when their physical electricity delivery comes from fossil-heavy grids. Critics argue this distorts the actual emissions associated with energy consumption.
Emerging Trend: Hourly Matching
To add rigor, a new model called hourly matching is gaining attention. Under this, a company should match its energy consumption hour-by-hour with renewable generation in the same hour and location to legitimately claim zero-emission electricity [8].
This approach is more demanding, and introduces challenges — scarcity of hourly RECs, higher cost, and complexity in grid deliverability. Some argue it may slow renewable procurement while others believe it enhances claim integrity.
Policy and accounting standards are under discussion to determine whether future updates will require stricter matching in Scope 2 claims.
Avoiding Double Counting
One core challenge is double counting, where multiple entities claim the same emission reductions. Studies have highlighted risks where companies overstate the benefit of certificates or PPAs, inflating offsets or distorting market signals [9]. Standards require proper retirement of certificates and ensuring they are not sold again or claimed elsewhere. Third-party registries help enforce this.
The debate continues about how to reconcile inventory accounting and consequential impact — i.e. did the certificate purchase actually cause new renewable energy deployment? That remains a complex issue in GHG standards evolution.
Strategies to Reduce Scope 2 Emissions
Calculating Scope 2 is only the first step. To make a meaningful climate impact, organizations must adopt strategic reduction measures. Below are proven approaches:
Energy Efficiency First
Reducing consumption is often the most reliable path. Common measures include:
- Upgrading lighting systems (LEDs)
- Improving building insulation and HVAC efficiency
- Installing smart meters and energy management systems
- Implementing power-saving IT policies
These measures reduce both emissions and costs; and work with any grid mix.
Shift to Low-Carbon Energy Contracts
Organizations can procure lower-emission energy through:
- Green electricity tariffs from suppliers
- Virtual or physical PPAs (direct contracts with renewable generators)
- On-site generation (solar, wind, battery storage)
Contracts with new additional renewable projects are preferred over existing ones to deliver net climate impact.
Purchase Certificates Carefully
When on-site or contract-generation is infeasible, companies may purchase RECs or EACs — ensuring they meet Scope 2 Quality Criteria. Ensure that instruments are retired properly and not double sold.
Evaluate certificate origin, vintage, enforceability, and certification standards.
Use Time-Based Matching
Adopting hourly or sub-hourly matching can enhance the integrity of renewable claims. Matching your load with renewable supply at the same hour and geographic region reduces consumptive mismatch. Though emerging, it sets a higher benchmark for future reporting.
Engage the Grid and Stakeholders
Large corporate consumers can partner with utilities or grid operators to influence cleaner grid operations, encourage green tariffs, or support grid decarbonization investments.
Also, disclose energy strategy, procurement decisions, and real emissions outcomes to stakeholders to build trust and accountability.
Challenges, Pitfalls, and Future Trends
While Scope 2 is foundational, several practical and conceptual challenges must be managed:
- Data Gaps: Some suppliers or energy providers may not offer disaggregated emissions data, limiting precision.
- Certificate Integrity: The additionality, traceability, and retirement of certificates remain under scrutiny.
- Accounting Evolution: The GHG Protocol is actively reviewing and evolving Scope 2 standards to close loopholes in matching claims and instrument treatment.
- Hourly Matching Pressure: As more companies adopt hourly matching, existing annual-based claims may face skepticism.
- Reconciling Inventory vs Impact: Should corporate claims reflect where energy is physically delivered or where impact is financed? This tension requires careful standards and disclosure.
- Double Counting Risks: Overlaps in certificate markets, especially across jurisdictions, increase risks of double counting if registries or retirement systems fail.
Looking ahead, advances in grid tracking (flow-based accounting), improved certificate systems, and integration between ISO standards and GHG Protocol may create more precise, aligned carbon accounting frameworks.
Conclusion: Elevating Scope 2 for Credible Impact
Scope 2 emissions are more than just accounting entries. They reflect how organizations consume energy and how they connect with broader electricity systems. Properly measuring, reporting, and reducing Scope 2 is central to credible ESG disclosure and climate strategy.
While easier to quantify than Scope 3, Scope 2 still demands methodological rigor, transparency, and credible contractual claims. The dual-reporting requirement (location-based & market-based) helps avoid greenwashing and enables stakeholders to evaluate the realism of renewable energy procurement claims.
By pairing reduction actions (efficiency, procurement, on-site generation) with robust accounting, organizations can reduce carbon risk, improve stakeholder trust, and demonstrate genuine climate leadership. As standards evolve and scrutiny increases, companies that establish strong foundations today will remain ahead in the race for a low-carbon future.
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References:
- https://ghgprotocol.org/scope-2-guidance
- https://ghgprotocol.org/sites/default/files/2022-12/Scope2_ExecSum_Final.pdf
- https://www.wri.org/research/ghg-protocol-scope-2-guidance
- https://dart.deloitte.com/USDART/home/publications/deloitte/additional-deloitte-guidance/greenhouse-gas-protocol-reporting-considerations/chapter-5-ghg-protocol-scope-2/5-7-reporting
- https://www.tandfonline.com/doi/full/10.1080/17583004.2025.2459920
- https://www.tandfonline.com/doi/full/10.1080/17583004.2025.2490562
- https://www.nature.com/articles/s41558-022-01379-5
- https://ghginstitute.org/2025/05/30/hourly-matching-limitations-for-scope-2-reporting/
- https://pubs.acs.org/doi/10.1021/acs.est.4c03792
