Scope 2 Emissions: What They Are, How to Measure Them, and Why They Matter 

Scope 2 is where energy and emissions accounting overlap most directly – and for many organizations, it represents the most immediate opportunity to reduce their carbon footprint. 

Scope 2 covers indirect greenhouse gas emissions from purchased electricity, steam, heating, and cooling. Unlike Scope 1, which deals with emissions generated directly by a company’s own operations, Scope 2 emissions occur at the point of energy generation, outside the boundaries of the reporting organization. The GHG Protocol defined Scope 2 as a distinct category precisely because, while these emissions happen elsewhere, they are attributable to specific companies based on how much energy they purchase and consume. That makes them more tractable than Scope 3 – but measuring them accurately still requires methodology, care, and consistency. 

Scope 2 is not just an electricity line item 

The most common source of Scope 2 emissions is purchased electricity. For most commercial and industrial organizations, that is also where the largest reduction opportunities sit. But Scope 2 also captures emissions from purchased steam, district heating, and cooling, depending on how a facility or portfolio is supplied. 

What makes Scope 2 distinctive as a reporting category is how directly it connects to energy decisions. Unlike Scope 3, which extends into supply chains and value-chain activities outside a company’s operational control, Scope 2 is shaped by the energy a company buys and how it buys it. That means changes to energy sourcing, efficiency, and procurement strategy all show up directly in Scope 2 figures, which is part of what makes this scope so strategically important. 

Why Scope 2 matters beyond compliance 

Energy generation accounts for roughly 40% of global greenhouse gas emissions, and the majority of that energy flows to commercial and industrial users. For companies serious about reducing their environmental impact, Scope 2 is one of the most actionable levers available. 

There are practical reasons to get Scope 2 right beyond regulatory pressure. Tracking Scope 2 emissions allows organizations to benchmark year-over-year progress, quantify the impact of energy efficiency upgrades, and evaluate the emissions consequences of procurement decisions. It also surfaces real geographic variation: grid carbon intensity differs significantly across regions, which can be a meaningful factor when evaluating where to locate new facilities or operations. Areas with dirtier energy mixes carry higher implied emissions burdens, and that kind of insight only becomes visible when Scope 2 data is tracked at the facility level. 

Stakeholder expectations are another driver. Boards, investors, and customers increasingly want to understand how a company manages its energy-related emissions. Having well-documented, defensible Scope 2 data in place puts organizations in a far stronger position to respond to those inquiries — and to support broader climate commitments with evidence. 

Two methods, one scope 

In 2015, the GHG Protocol updated its guidance on Scope 2 emissions and introduced a framework that most organizations now navigate: the location-based method and the market-based method. Understanding the difference between these two approaches is fundamental to Scope 2 accounting. 

The location-based method reflects the average carbon intensity of the electrical grid where a facility operates. It uses grid average emission factors — in the U.S., the EPA’s eGRID subregion data divides the country into regions that approximate how electricity is actually distributed across the grid. The location-based method does not account for any renewable energy purchasing decisions a company may have made. The only way to reduce location-based emissions is to reduce total energy consumption or increase on-site renewable generation used directly at the premises. 

The market-based method takes a different approach. It reflects the emissions associated with the specific electricity a company has chosen to procure — accounting for contractual instruments that companies use to source lower-carbon energy. This includes: 

• Renewable Energy Certificates (RECs)  
• Guarantees of Origin (GOs)  
• Direct contracts with energy suppliers  
• Supplier-specific emission rates  
• The residual mix 

Market-based emissions are calculated using the same total energy consumption data as location-based emissions, but apply different emission factors depending on what contractual instruments a company holds. The two totals are reported separately, not summed together. Each tells a different story about the same underlying energy activity. 

The residual mix is worth understanding in its own right. It represents the grid’s energy mix after all certified renewable attributes have been claimed and retired. For companies that hold no contractual instruments, the residual mix is the appropriate emission factor for market-based reporting. Because it strips out all claimed renewables, the residual mix is often more carbon-intensive than the simple grid average — which means companies without active procurement programs can see a higher market-based number than location-based. 

The GHG Protocol recommends that companies report both methods side by side, a practice called dual reporting. This provides transparency not just about what a company is emitting, but about the choices behind that footprint. 

Contractual instruments and quality criteria 

Market-based Scope 2 accounting is only as credible as the instruments behind it. The GHG Protocol has established a hierarchy of quality criteria that contractual instruments must meet in order to be used in market-based calculations. Instruments that do not meet those criteria cannot be used in the formal emissions calculation, though they can still be disclosed separately for transparency. 

This is a place where some organizations run into difficulty. RECs purchased through certain channels, or instruments that do not meet the temporal or geographic requirements of the quality criteria, may not qualify under the GHG Protocol framework. That does not make them worthless, but it does mean the accounting treatment needs to be applied carefully and documented clearly. 

Scope 2 data collection is often the hardest part 

One of the more counterintuitive aspects of Scope 2 reporting is that the data challenge is less about finding the right emission factors and more about collecting complete and accurate consumption data in the first place. 

Utility bills, interval meter data, and facility energy records are the primary inputs for Scope 2. In principle, that sounds straightforward. In practice, many organizations operate across dozens or hundreds of locations, served by different utilities, on different billing cycles, with varying levels of data completeness. Getting full coverage — particularly across leased spaces where bills may be paid by landlords — is often the most time-intensive part of the process. 

Accuracy matters too. Missing or estimated bills, mis-coded consumption records, and late data are all common sources of error. For organizations that need to assure their emissions data externally — whether for investor disclosure, regulatory reporting, or CDP — the quality of the underlying utility data becomes directly relevant to the credibility of the final inventory. 

The regulatory landscape for Scope 2 is evolving 

Scope 2 reporting is no longer a voluntary exercise for many companies. It is embedded in mandatory disclosure frameworks across multiple jurisdictions and is a required component of major sustainability standards. 

IFRS S2, issued by the International Sustainability Standards Board, requires disclosure of gross Scope 1, Scope 2, and Scope 3 emissions, measured in line with the GHG Protocol. The December 2025 amendments to IFRS S2 introduced targeted reliefs and clarifications — primarily focused on Scope 3 Category 15 financed emissions — while reaffirming the core structure of emissions disclosure requirements. Those amendments are effective for reporting periods beginning on or after January 1, 2027, with early application permitted. 

The GHG Protocol itself is in the middle of a significant update process. After a public consultation period that ran from October 2025 through January 2026, the Protocol is working to revise the Scope 2 Guidance (2015) — with a second consultation expected in 2026 and a final updated standard anticipated in 2027. The proposed revisions aim to improve accounting accuracy and better reflect how electricity is produced and delivered, including proposed changes to how energy attribute certificates are matched to consumption and how the residual mix is calculated. These changes, once finalized, could affect how RECs and other instruments qualify under the market-based method, as well as the data precision requirements for both methods. 

Companies tracking against the current guidance should be aware that the framework underpinning their Scope 2 accounting is actively under review, and that a second consultation cycle is expected to address additional topics including purchased steam, heat, and cooling. 

Good Scope 2 reporting is also a data governance exercise 

Teams sometimes treat Scope 2 as a straightforward calculation once the emission factors are in place. In practice, the quality of a Scope 2 inventory depends heavily on the processes behind it. 

A stronger Scope 2 process typically involves: 

• complete and timely utility data collection across all facilities  
• clear documentation of which method is applied and why  
• a consistent approach to contractual instruments and quality criteria  
• defined ownership for data collection across facilities, finance, and sustainability teams  
• a process for handling gaps, estimates, and late data  
• regular review and updating of emission factors as new versions are published 

Without that structure, Scope 2 reporting can become a retroactive scramble to pull together utility data at the end of the year. With it, organizations are better positioned to produce results they can stand behind — and improve them in each subsequent cycle. 

What a better Scope 2 process looks like 

The organizations that report Scope 2 well tend to do a few consistent things. They collect utility data continuously rather than in a single year-end push. They document their methodology — including which method is primary, which instruments they hold, and how they handle the residual mix — before the calculation starts. They build coverage maps that show which facilities are included and flag gaps. And they treat the process as a repeatable workflow, not a one-time project. 

In practice, a stronger Scope 2 process often looks like this: 

Scope 2 reporting is increasingly judged not only by the final number, but by whether the methodology is credible and the data behind it is traceable. 

How Tango helps 

Tango Energy & Sustainability helps organizations build the data foundation that Scope 2 reporting depends on. That starts with utility data — acquiring, auditing, and consolidating utility invoices and interval data across facilities and utilities globally, so that the consumption inputs going into emissions calculations are complete and reliable. 

For teams working through Scope 2, that kind of underlying data quality matters. Location-based calculations are only as accurate as the consumption data going in. Market-based calculations are only credible if the instruments behind them meet quality criteria and are consistently applied. And dual reporting is only useful if both sets of numbers can be traced back to the same defensible source data. Scope 2 becomes more manageable when the data is organized before the reporting deadline arrives. 

The core challenge of Scope 2 reporting is not finding the right formula. The formulas are well-established, and the GHG Protocol guidance — for now — is clear. The challenge is building the processes and data infrastructure that make those formulas work at scale: consistent utility data, documented methodology, and a repeatable workflow that improves with each reporting cycle. Organizations that get those foundations right find that Scope 2 becomes not just a compliance exercise, but a genuine window into where their energy-related emissions come from — and where the most meaningful reductions are possible.