Where EACs Fit in Scope 3 Decarbonization Strategies

For many companies, Scope 3 has become the hardest part of the climate agenda to move from ambition to action. The emissions are often outside direct operational control, spread across suppliers, products, geographies, and procurement relationships. Even when a company has strong internal targets, the largest share of its footprint may sit with companies it buys from rather than sites it owns.

That is why supplier engagement has become such an important part of corporate decarbonization. Companies are no longer looking only at their own electricity contracts or office energy use. They are asking how their suppliers buy electricity, what kind of data they can provide, and whether those changes can be reflected in the buyer’s own Scope 3 inventory.

This is where Energy Attribute Certificates, or EACs, increasingly enter the conversation. EACs are already familiar in Scope 2 renewable electricity claims, but their role in Scope 3 is less direct. They do not simply move from a buyer’s account into a supplier’s emissions profile. Used well, they can support supplier renewable electricity procurement and help improve the data that flows upstream to corporate buyers.

The important point is that EACs are not a shortcut around supplier action. They are most useful when they are part of a supplier-side procurement strategy, backed by clear ownership, retirement evidence, and primary data from the supplier. For companies trying to reduce supply chain emissions, that distinction matters.

Why Scope 3 Is Now a Bigger Part of the Conversation

The largest emissions are often outside the company’s own operations

For many corporate sustainability teams, Scope 1 and 2 emissions are now the more familiar parts of the inventory. Scope 1 covers direct emissions from company operations. Scope 2 covers purchased electricity and energy. Scope 3 is different because it covers value chain emissions, including those tied to purchased goods and services, capital goods, logistics, product use, and other activities outside the company’s own walls.

This is why Scope 3 can feel much more difficult to manage. A company may have a strong renewable electricity strategy for its own offices, factories, or data centers, while still relying on hundreds or thousands of suppliers that use electricity from very different markets. Some suppliers may already have renewable options. Others may operate in places where clean electricity access is limited, local rules are complex, or procurement resources are thin.

Supplier data is becoming part of the strategy

The challenge is also about data. For upstream Scope 3, the buyer needs supplier-specific information to understand whether real operational changes are happening. If a supplier reduces its own electricity-related emissions, that change can become relevant to the buyer’s Scope 3 accounting when it is reflected in supplier primary data or a verified product carbon footprint.

That is why supplier renewable electricity procurement is receiving more attention. It connects a practical operational lever, electricity procurement, with a data pathway that can matter for Scope 3 reporting. EACs sit inside that broader conversation, but they need to be used carefully.

Why Supplier Emissions Are Hard to Reduce

Buyers have influence, but not direct control

Supplier emissions are difficult because the buyer usually does not control the supplier’s energy contracts. Even large customers may have influence, but influence is not the same as operational control. A supplier decides how it powers its facilities, what contracts it can sign, what local products it can access, and what documentation it can provide.

This means supplier decarbonization cannot be treated like an internal energy procurement project. Buyers can set expectations, offer support, create programmes, and ask for better data. But the actual electricity procurement decision often still needs to happen at the supplier level.

Each market has its own rules and limitations

The market context also varies sharply by country. In some markets, suppliers may have access to on-site solar, green tariffs, domestic PPAs, or domestic EACs. In others, the available options may be limited, fragmented, or shaped by local rules that do not easily fit global corporate accounting expectations.

This matters because renewable electricity claims depend on more than good intentions. The certificate or contract needs to fit the relevant market. It needs to be traceable. It needs to be retired or cancelled properly. It needs to have a clear claimant or beneficiary. When these details are weak, the buyer may still be supporting useful climate action, but it may not have the strongest basis for a Scope 3 inventory claim.

Many suppliers need practical support before they can act

For suppliers, there is also a capacity issue. Smaller and medium-sized suppliers may not have internal energy procurement teams, legal support, or experience with renewable electricity instruments. This is why the stronger supplier programmes tend to combine education, market guidance, contract support, aggregation, and pre-vetted procurement options rather than asking each supplier to solve the problem alone.

In practice, this means supplier engagement needs to go beyond asking suppliers to “use renewable electricity.” It needs to help them understand which options are available, what evidence is required, and how their procurement decisions can be reflected in emissions data.

How Renewable Electricity Procurement Supports Supplier Action

Different suppliers need different procurement options

Electricity is often one of the more practical places to start with suppliers because there are multiple ways to procure renewable electricity. Depending on the market, suppliers may use on-site generation, green tariffs, sleeved or third-party PPAs, bundled off-site PPAs, virtual PPAs, domestic certificate purchases, or unbundled EACs.

Each option has a different role:

• On-site generation can create a visible link between a facility and renewable generation, but it depends on site conditions, ownership, tariffs, and local rules.
• Green tariffs or renewable retail products may be easier for smaller suppliers where credible products exist.
• PPAs can support larger or more strategic suppliers, especially where long-term contracting is possible.
• Unbundled EACs can be useful for residual electricity use, smaller suppliers, or faster-start programmes.

EACs are flexible, but they need careful use

Unbundled EACs can be useful for residual electricity use, smaller suppliers, or faster-start programmes. They are flexible and scalable, which is why they often appear in supplier programmes. At the same time, they tend to receive more scrutiny when used alone, especially if the retirement chain, market boundary, or beneficiary claim is unclear.

This is why a laddered approach is often more practical than choosing one instrument for every supplier. Large strategic suppliers may be ready for PPAs or on-site projects. Smaller suppliers may need simpler certificate-based options. Suppliers in constrained markets may need local guidance first, then a more tailored procurement route.

Where EACs Fit in Scope 3 Strategies

First, what an EAC actually does

An EAC is a contractual instrument that tracks the attributes of renewable electricity generation. It does not represent the electricity itself. Instead, it provides a way to track, transfer, and retire the environmental attributes linked to a unit of generation.

In Scope 2, a company may use EACs directly for its own market-based electricity accounting when the instrument meets the relevant quality criteria. In Scope 3, the pathway is different. The emissions first belong in the supplier’s inventory. That means the buyer only sees a Scope 3 benefit when the supplier’s own reported emissions, product footprint, or other primary data improve and that improved data is passed up the chain.

The Scope 3 pathway is indirect

This is the core point for buyers. EACs can support Scope 3 decarbonization when they help suppliers reduce their own electricity-related emissions. They do not automatically reduce a buyer’s Scope 3 footprint simply because the buyer purchased certificates somewhere in the system.

A strong Scope 3 pathway usually looks like this:

1. The supplier procures renewable electricity or EACs under an appropriate local route.
2. The relevant certificates are retired or cancelled properly.
3. The supplier updates its own emissions data or product carbon footprint.
4. The buyer uses that supplier-specific data in its upstream Scope 3 reporting.

The logic is simple, but the execution needs discipline. The EAC needs to sit inside a supplier-side accounting and data process, not outside it.

The Opportunity: Scaling Supplier Participation

EACs can help more suppliers participate

The biggest opportunity is scale. Many companies have complex supply chains spread across different countries. Asking every supplier to independently assess renewable procurement options can be slow and uneven. EACs, when used within a clear programme, can make participation more accessible for suppliers that are not ready for larger contracts.

This is especially relevant for residual load and smaller suppliers. A supplier may not be able to sign a long-term PPA, install solar, or negotiate a green tariff immediately. A domestic EAC route may still give that supplier a way to address electricity-related emissions while building toward a broader procurement strategy.

Aggregation can make supplier action more practical

The research points to supplier aggregation as one of the stronger models in current practice. Apple reports 17.8 GW of renewable electricity online in its global supply chain and 21.8 million metric tons of greenhouse gas emissions avoided in 2024. Schneider Electric’s Energize programme brought together eight companies into 27 PPAs covering 563.7 GWh per year and more than 280 MW of new solar in Spain.

These examples show that supplier decarbonization is rarely only about the instrument itself. It is about making renewable procurement possible for companies that may not have the scale, knowledge, or internal capacity to act alone.

The strongest programmes usually combine several forms of support

Supplier programmes tend to work best when they do more than present one procurement route. They often combine several layers of support, such as:

• Supplier education
• Country-specific market guidance
• Contract support
• Aggregated procurement
• Pre-vetted local options
• Clear requirements for evidence and reporting

This is where EACs can become more valuable. They are not simply certificates being purchased in isolation. They become one of several tools that help suppliers move from awareness to action.

The Limitation: Claims Need to Stay in the Right Place

Scope 3 is not Scope 2

The main limitation is that Scope 3 is not Scope 2. A company can usually make its own Scope 2 market-based claim when it procures and retires eligible instruments for its own electricity use. In Scope 3, the buyer is looking at emissions that sit with another company first.

That creates a risk of overstating impact. If a buyer purchases EACs but the supplier’s own inventory does not change, the buyer may be financing renewable electricity activity, but it does not yet have the strongest basis for a Scope 3 inventory reduction. The supplier-side data, retirement chain, and claim structure need to match.

Double claiming is a real risk

There is also a risk of double claiming. Multiple parties may want to point to the same renewable procurement action: the supplier, the buyer, a programme sponsor, and possibly other customers. Without clear beneficiary designation, retirement evidence, and internal claim rules, the story can become stronger than the accounting basis behind it.

This is why companies need to separate three types of claims:

• Inventory claims: what can be reflected in the Scope 3 number.
• Transition contribution claims: what the company helped finance or unlock.
• Market impact narratives: how the company is supporting supplier action or market development.

These can all be valuable, but they should not be treated as the same thing.

Why Domestic Supplier Instruments Usually Come First

Local routes are often the most defensible starting point

For most supplier programmes, domestic procurement routes should be the starting point. These may include on-site generation, green tariffs, domestic bundled products, domestic PPAs, or domestic unbundled EACs retired for the supplier.

This hierarchy matters because renewable electricity rules are not identical across countries. The European GO system has a more mature cross-border structure within connected markets. The UK and EU have weaker interoperability after Brexit. China treats Green Electricity Certificates as the sole official proof of renewable electricity attributes domestically. Japan relies heavily on Non-Fossil Certificates, with more complex end-user claim architecture. South Korea’s K-RE100 routes are domestic by design.

One certificate strategy will not work everywhere

For buyers, the practical message is simple: do not assume that one certificate strategy works everywhere. Supplier programmes need to be designed market by market, especially when the supply chain crosses regions with different certificate systems and recognition rules.

Cross-border EACs may still have a role, particularly where domestic options are limited. But they need a clear framework for permitted registries, beneficiary recognition, residual-mix treatment, and the connection between the supplier’s electricity use and the instrument used for claim-making. Without those elements, the company may still be supporting climate action, but the inventory claim becomes weaker.

Practical Questions for Corporate Buyers

Most corporate buyers do not need to become certificate market experts. But they do need to ask better questions before treating EACs as part of a Scope 3 strategy.

Useful questions include:

• Is the supplier using a domestic procurement route where possible?
• Are the certificates retired or cancelled by, or on behalf of, the correct entity?
• Is the beneficiary clearly named where relevant?
• Does the certificate match the supplier’s market and consumption period?
• Can the supplier provide primary emissions data or a verified product footprint?
• Is there evidence that the same certificate has not been used for another claim?
• Are inventory claims separated from broader transition or market impact claims?

These questions help keep the discussion grounded. The goal is not to make every buyer responsible for technical accounting decisions. The goal is to make sure supplier renewable electricity procurement is backed by evidence that can support the right kind of claim.

What Stronger Governance Looks Like

For larger programmes, companies may also need clear internal governance. This does not need to make the strategy overly complex, but it should give teams a consistent way to evaluate supplier procurement and claims.

A stronger governance approach may include:

• Defining allowed instruments by country
• Making attribute ownership explicit in supplier contracts
• Requiring retirement evidence and certificate identifiers
• Giving audit teams access to registry evidence
• Separating Scope 3 inventory claims from broader contribution claims
• Creating a process for pausing or revising claims when local rules change

This kind of governance is especially important in markets where rules are still developing. It helps companies avoid treating a useful procurement activity as a stronger accounting claim than the evidence supports.

What This Means for Scope 3 Decarbonization

EACs are a supplier engagement tool, not a buyer-side fix

EACs can play a meaningful role in Scope 3 decarbonization strategies, but only when they are used in the right way. Their value is strongest when they help suppliers reduce their own electricity-related emissions and improve the data that flows into the buyer’s Scope 3 inventory.

This makes EACs a supplier engagement tool rather than a buyer-side fix. They can support participation, expand procurement options, and help companies reach suppliers that may not be ready for larger renewable electricity contracts. They can also fill gaps where residual electricity use remains after other procurement options.

The strongest programmes keep the claim architecture clear

At the same time, EACs need careful governance. The strongest programmes keep domestic options first, use cross-border structures only where rules are clear, require proper retirement and beneficiary evidence, and separate inventory reductions from broader climate contribution narratives.

For companies working on Scope 3, the question is not whether EACs are good or bad. The better question is whether they are being used in a way that changes supplier-side emissions data, supports credible claims, and fits the local market where the supplier operates.

When those conditions are met, EACs can become part of a serious Scope 3 strategy. When they are missing, EACs may still support renewable electricity markets, but they should be communicated with more caution.