What Are Scope 2 Emissions and Why Does the Accounting Method Matter?

Scope 2 emissions represent indirect greenhouse gas emissions from the generation of purchased electricity, steam, heat, or cooling consumed by a company. Unlike Scope 1 (direct emissions from owned sources), Scope 2 emissions occur at the power plant or heat generation facility — outside the company's direct control. But because the company's purchasing decisions determine which energy is generated and consumed, it bears indirect responsibility for those emissions. The methodological distinction between location-based and market-based Scope 2 accounting — which generates dramatically different numbers for the same company — is one of the most contested and consequential technical choices in corporate GHG reporting, with significant implications for how investors assess companies' electricity-related carbon exposure.

Quick definition: Scope 2 emissions are indirect GHG emissions from the generation of purchased or acquired electricity, steam, heat, or cooling. The GHG Protocol offers two accounting methods: location-based (using the average emission factor of the local electricity grid) and market-based (using the emission factor of the specific electricity the company has contracted to purchase, including renewable energy certificates).

Key takeaways

• Scope 2 is particularly important for energy-intensive technology companies, data center operators, and any sector with significant electricity consumption — these companies' electricity-related carbon exposure can represent the majority of their operational (Scope 1 + 2) footprint.
• Location-based Scope 2 accounting reflects the actual emissions intensity of the electricity grid the company is connected to — a data center in Poland (high-coal grid) has high location-based Scope 2; the same data center in Iceland (almost all geothermal) has near-zero location-based Scope 2.
• Market-based Scope 2 accounting reflects the emission factor of the specific electricity contracted by the company — if a company purchases renewable energy certificates (RECs) or enters a power purchase agreement (PPA) for wind or solar power, its market-based Scope 2 can be near zero even if the physical electricity supply is from a high-carbon grid.
• The controversy: critics argue that purchasing RECs allows companies to claim near-zero Scope 2 while actual physical electricity consumption from the grid is carbon-intensive — and that RECs from existing renewable projects may not represent additional renewable energy generation that wouldn't have occurred anyway.
• ISSB S2 and CSRD ESRS E1 both require disclosure of both location-based and market-based Scope 2, enabling investors to compare actual grid emissions versus contracted renewable claims.

Location-Based vs. Market-Based: The Core Distinction

Location-Based Method

Location-based Scope 2 uses the average emission factor of the electricity grid(s) connected to the company's facilities. If a company operates in Germany, its location-based Scope 2 reflects the average carbon intensity of the German electricity mix (which has been declining as coal plants close and renewable capacity grows).

Calculation: Total purchased electricity (kWh) × average grid emission factor (tCO₂e/kWh) = location-based Scope 2 emissions

Location-based Scope 2 provides a physical picture of the emissions associated with the electricity actually flowing through the grid to the company's facilities — regardless of what contracts or certificates the company holds.

Market-Based Method

Market-based Scope 2 uses the emission factor of the specific electricity instruments the company has contracted to purchase:

• Power Purchase Agreements (PPAs): Long-term contracts where a company agrees to purchase electricity directly from a specific renewable energy project (a wind farm or solar installation), often at a fixed price. The PPA provides an emissions attribute certificate with a near-zero emission factor.
• Renewable Energy Certificates (RECs) / Guarantees of Origin (GOs): Certificates representing one megawatt-hour of renewable energy generation. Companies can purchase RECs separately from the physical electricity supply, using the REC's emission factor for market-based Scope 2 calculation.
• Green tariffs: Utility-provided offerings where a specific portion of grid electricity is attributed to renewable sources.

If a company has purchased RECs covering 100% of its electricity consumption, its market-based Scope 2 is zero — regardless of what the physical electricity mix is.

Accounting method comparison

The REC Controversy

The primary debate about Scope 2 accounting centers on whether renewable energy certificates actually represent additional environmental benefit or merely allow companies to claim renewable energy while physically consuming fossil-fuel electricity:

The additionality argument against RECs: When a company purchases a REC from an existing hydroelectric plant that would have generated that power regardless of the REC purchase, the REC transaction does not result in any additional renewable energy being generated — and therefore does not result in any actual emissions reduction relative to the counterfactual. The company's market-based Scope 2 falls to near zero, but actual electricity system emissions are unchanged.

The market signal argument for RECs: REC purchases create financial revenue for renewable generators, improving their economics and signaling market demand for renewable energy. Over time, this supports renewable energy development by demonstrating market interest. New PPAs (where companies contract with new renewable projects, creating project-enabling revenue) have stronger additionality than spot REC purchases from existing projects.

The EnergyTag and hourly matching proposal: Rather than annual matching (buying RECs representing the same kWh quantity as annual electricity consumption), hourly matching verifies that renewable energy was generated in the same hour, on the same regional grid, as consumption. This provides much stronger evidence that the renewable energy physically reduced grid emissions during the hours of consumption. EnergyTag is the industry initiative developing hourly matching standards.

Investment implications: Companies claiming near-zero market-based Scope 2 based on spot REC purchases from existing renewable projects face credibility questions about whether their "100% renewable electricity" claims reflect genuine decarbonization. Companies with physical PPAs for new renewable projects, or with hourly-matched renewable procurement, have stronger sustainability credentials. Google, Microsoft, and Apple have all made commitments to 24/7 carbon-free energy — matching energy consumption with carbon-free generation on an hourly basis — representing the most rigorous renewable electricity standard.

Scope 2 by Sector

Scope 2 importance varies significantly by sector:

High Scope 2 importance:

• Data centers and cloud computing: Electricity is the dominant operational input and cost. Amazon Web Services, Microsoft Azure, and Google Cloud represent some of the largest corporate electricity consumers globally.
• Semiconductor manufacturing: Chip fabrication requires enormous electricity inputs for cleanroom environments and manufacturing equipment.
• Aluminum smelting: Electrochemical reduction of aluminum oxide requires substantial electricity.
• Electric vehicle manufacturing: Assembly processes with high electricity consumption.

Lower Scope 2 importance (Scope 1 or 3 dominate):

• Oil and gas production: Process and fugitive Scope 1 emissions dominate
• Airlines: Scope 1 jet fuel combustion dominates
• Financial services: Scope 1 and Scope 2 combined are minor; Scope 3 (financed emissions) dominates

Renewable Energy Procurement Strategies

Investors can use Scope 2 disclosure to assess the credibility and ambition of companies' renewable energy procurement strategies:

Tier 1 — physical renewable PPAs in same region: Entering long-term contracts with new renewable energy projects in the same geographic region as consumption. This ensures geographic and temporal matching and supports new renewable capacity development. Most credible for market-based Scope 2 claims.

Tier 2 — physical renewable PPAs (different region): Less credible because the renewable energy may be generated in a region with different grid characteristics than where electricity is consumed.

Tier 3 — bundled renewable energy products (green tariffs): Utility-offered renewable energy products where the utility attributes specific renewable generation to the customer. Quality depends on whether the underlying renewable energy is new and regionally matched.

Tier 4 — unbundled RECs/GOs: Annual REC or Guarantee of Origin purchases from existing renewable projects, often in different regions or countries. Provides renewable attribute claim but weakest from additionality perspective.

RE100 — the corporate renewable electricity commitment initiative — has been updating its guidance to emphasize higher-quality renewable procurement and hourly matching as the frontier standard.

Real-world examples

Google's renewable energy approach: Google has been a leader in Scope 2 management, focusing on 24/7 carbon-free energy — ensuring that for every hour of electricity consumption, an equivalent amount of carbon-free energy is generated on the same regional grid. Google's carbon-free energy percentage (CFE%), disclosed annually, reflects the fraction of hourly consumption matched with carbon-free generation. This approach, more rigorous than annual REC matching, requires strategic procurement of flexible carbon-free sources (including geothermal and nuclear alongside renewables).

Steel industry Scope 2: Electric arc furnace steelmaking uses electricity to melt scrap metal — making steel's Scope 2 profile highly dependent on grid carbon intensity. A steel company in Sweden (near-zero grid due to hydropower and nuclear) using electric arc furnaces can produce steel with very low Scope 1 and 2 emissions. The same technology in Poland (high-coal grid) has a much larger Scope 2 footprint. This grid carbon intensity sensitivity is central to the green steel investment thesis.

Common mistakes

Comparing market-based and location-based Scope 2 without noting the method: An ESG analysis that reports a company's Scope 2 without specifying whether it is market-based or location-based can be comparing incomparable figures across companies. Some companies report only market-based (often very low due to REC purchases); others report only location-based. ISSB S2 and CSRD require both — but until mandatory disclosure is universal, many companies report only one method.

Accepting near-zero market-based Scope 2 as equivalent to near-zero physical emissions: A company claiming near-zero market-based Scope 2 based on spot REC purchases from existing renewable projects has not necessarily reduced physical electricity system emissions. The most credible near-zero Scope 2 claims are backed by physical PPAs with new renewable projects and hourly-matched consumption data.

FAQ

What is a guarantee of origin and how does it relate to Scope 2?

A guarantee of origin (GO) is the European equivalent of a renewable energy certificate — a certificate that one megawatt-hour of electricity was generated from a specific renewable energy source. Like RECs, GOs can be purchased separately from the physical electricity supply and used to support market-based Scope 2 claims. European GO prices are typically low, partly reflecting that many represent existing renewable capacity (hydropower) with questionable additionality.

Do all companies need to report Scope 2?

Companies subject to mandatory GHG disclosure requirements (CSRD in the EU, mandatory TCFD in the UK, SEC disclosure rule if finalized in the US) must report Scope 2 alongside Scope 1. CSRD requires both location-based and market-based Scope 2. Voluntary GHG reporting frameworks (GRI, TCFD) recommend Scope 2 disclosure and specify that both methods should be reported if a company claims near-zero Scope 2 based on market-based accounting.

Related concepts

• Scope 1 Emissions
• Scope 3 Emissions
• Carbon Footprint Portfolio
• Renewable Energy Metrics
• ESG Glossary

Summary

Scope 2 emissions — indirect GHGs from purchased electricity, steam, heat, or cooling — are reported using two methods: location-based (average grid emission factor, reflecting physical electricity mix) and market-based (contractual emission factor, reflecting renewable certificates or PPAs). The methods can produce dramatically different numbers for the same company. The credibility of near-zero market-based Scope 2 depends on the quality of renewable procurement: physical PPAs for new renewable projects with hourly matching are most credible; spot purchases of unbundled RECs from existing projects are least credible. ISSB S2 and CSRD ESRS E1 require disclosure of both methods, enabling comparison. Scope 2 is most material for electricity-intensive sectors — data centers, semiconductor manufacturing, aluminum — where electricity is a dominant operational input.

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