Zettawatts Additionality RECs Market: How It Works and Who It Fits

Companies looking to increase the impact of their renewable electricity procurement often have to choose between relatively simple unbundled RECs and more complex project-linked contracts such as PPAs or VPPAs.

The Zettawatts Additionality RECs Market is designed to sit between those approaches. Zettawatts sells forward contracts for renewable energy certificates from new projects that have not yet reached commercial operation. The company acts as an intermediary between corporate buyers and renewable project developers, allowing buyers to commit to future certificates without taking the same project-level power-price exposure associated with a VPPA.

This guide explains how the AREC model works, how it differs from spot RECs and VPPAs, why Microsoft supplier requirements have created demand for higher-impact procurement, and what buyers should understand about project substitution, additionality, counterparty risk, and the evolving GHG Protocol Scope 2 rules.

What an Additionality REC Actually Is

A renewable energy certificate (REC) represents the environmental attributes associated with one megawatt-hour (MWh) of renewable electricity generation. Under the current GHG Protocol Scope 2 framework, contractual instruments such as RECs can be used in the market-based method when they meet the applicable quality criteria.

An Additionality REC (AREC) adds a different attribute: the buyer makes a forward financial commitment to purchase certificates from a renewable energy project before the project reaches commercial operation. Zettawatts says the commitment is intended to contribute to project financing and uses timing and investment-related criteria when defining additionality.

There is an important distinction here. The current GHG Protocol Scope 2 Guidance does not require market-based instruments to demonstrate offset-style additionality. GHG Protocol explicitly distinguishes Scope 2 energy-attribute accounting from project-level additionality.

Therefore, an AREC’s “additionality” should be treated as a procurement attribute and impact claim, not as a current Scope 2 compliance requirement. Buyers should review how the seller defines additionality, what project-financing evidence is provided, and what happens if the original project does not reach commercial operation.

How the Zettawatts Additionality RECs Market Works

Zettawatts operates the AREC Market as an intermediary between corporate buyers and renewable energy project developers. Buyers make fixed-price offers for future unbundled RECs, while Zettawatts contracts with developers for the first five or ten years of a project’s certificate output.

The buyer receives the renewable energy certificates rather than the project’s electricity, capacity, or other power-market revenues. That distinction is important when comparing ARECs with PPAs and VPPAs.

Zettawatts says the AREC Market is not a bilateral marketplace. Instead, it aggregates corporate demand and contracts with developers, which is intended to reduce the need for each buyer to negotiate directly with an individual project.

The important trade-off is that buyers gain simplicity and diversification but give up some of the direct project relationship associated with a VPPA.

This was a June 2025 procurement notice rather than evidence of a currently open 2026 RFP. It is useful as an example of how Zettawatts structures developer procurement, but buyers should check the company’s current procurement terms before relying on the figures.

Why Demand Exists: Microsoft’s Supplier CFE Requirements

Microsoft’s supplier requirements are an important source of demand for higher-impact renewable electricity procurement.

Microsoft’s current Supplier Code of Conduct requires suppliers to transition to and maintain 100% carbon-free electricity for Microsoft-delivered goods and services by 2030. Microsoft also says its Supplier Carbon-Free Electricity Guidance prioritizes approaches that support higher-impact clean-energy procurement and new carbon-free generation.

The supplier CFE guidance also places geographic and timing conditions on qualifying generation. CFE generation must generally occur in the same market as the Microsoft-related electricity consumption and within a 21-month vintage window around the reporting year.

Zettawatts says that more than 50 Microsoft suppliers are currently using ARECs toward the 2030 guidance. That figure is a Zettawatts-reported customer count rather than an independently audited market statistic.

The important point for buyers is that an AREC should not be treated as automatically qualifying for every corporate clean-energy program. Companies should compare the specific project, geography, vintage, retirement documentation, and other requirements against the current program rules that apply to them.

A related example comes from Ever.green. In April 2026, Ever.green announced that a group of Microsoft suppliers had signed long-term REC contracts supporting the 5 MW Baron solar project in Anson County, North Carolina, which the company said reached financial close with that support.

The example shows that long-term REC commitments can be part of the financing story for a new renewable project. It does not, by itself, establish that every forward REC purchase will be decisive to a project’s construction or financing.

ARECs vs VPPAs vs Spot RECs

ARECs trade some of the direct project relationship and power-market exposure of a VPPA for a simpler certificate-only structure. The main trade-off is that buyers need to understand the rules governing project selection, substitution, geography, vintage, and certificate delivery.

What Happens If an AREC Project Never Reaches Commercial Operation?

This is one of the most important contractual questions for an AREC buyer.

Zettawatts says its pooled structure allows certificates from a project that fails to reach commercial operation to be replaced with certificates from another qualifying project.

That protects the buyer against simply losing the contracted certificate volume, but it creates a second question: does the replacement project have the same attributes?

A replacement could differ in geography, technology, project identity, or other characteristics unless those requirements are explicitly defined in the contract.

Before signing, buyers should therefore ask:

• What qualifies as a replacement project?
• Must the replacement remain in the same market?
• Must it use the same technology?
• Must it meet the same COD requirements?
• Does the replacement preserve the same additionality criteria?
• What happens if no qualifying replacement is available?
• Can the buyer reject a proposed replacement?

For companies that need a specific geographic or project-level claim, these provisions may matter as much as the headline REC price.

Limitations Buyers Should Weigh

• Annual certificates: ARECs do not provide hourly carbon-free electricity matching by themselves.
• Counterparty concentration: The buyer’s contractual relationship runs through Zettawatts rather than directly to each renewable project.
• Substitution risk: A failed project may be replaced, but the replacement project’s attributes should be defined contractually.
• Additionality is a procurement attribute, not a current Scope 2 requirement: The current GHG Protocol Scope 2 Guidance does not require market-based instruments to demonstrate additionality.
• Delivery lag: Forward contracts depend on projects reaching commercial operation and subsequently generating the contracted certificates.
• Geographic requirements: Buyers with strict same-market or location requirements need to verify how project selection and replacement are handled.
• Changing reporting rules: Future Scope 2 requirements could change the accounting usefulness of annual, geographically broad certificate purchases.
• Contract duration: A five- or ten-year commitment can create obligations that remain in place while corporate electricity consumption, reporting frameworks, or procurement strategies change.

What the GHG Protocol Scope 2 Rewrite Could Change

The GHG Protocol is revising its 2015 Scope 2 Guidance, but the final requirements are not settled.

The first Scope 2 public consultation ran from October 20, 2025 through January 31, 2026 and received nearly 1,100 responses from 56 countries. The proposal included hourly matching for larger organizations, deliverability requirements, exemptions, standardized load profiles, a possible legacy clause for existing contracts, and phased implementation.

Feedback showed significant disagreement with parts of the proposal. The GHG Protocol’s July 2026 summary reported low support for the proposed hourly-matching and deliverability requirements among several major respondent groups, while also noting that many respondents supported feasibility measures such as exemptions and a legacy clause.

The process has therefore moved beyond the original consultation draft. In July 2026, the Independent Standards Board directed further work on multiple approaches to the market-based method, with the Technical Working Group tasked with refining the options and resolving open questions. The GHG Protocol says further steps and any additional public consultation will follow its standard development process.

For AREC buyers, the practical lesson is simple: do not treat the proposed hourly-matching or legacy rules as final requirements. They are part of an evolving standard-development process.

At the same time, buyers signing long-term contracts should model more than one scenario. An annual certificate-only contract could face different reporting treatment under a future Scope 2 framework depending on the final rules for matching, deliverability, exemptions, and existing contracts.

The current 2015 Scope 2 Guidance does not require additionality for market-based accounting. That makes it important to separate three questions when evaluating an AREC:

1. Does the certificate qualify for the applicable Scope 2 accounting rules?
2. Does the project meet the buyer’s definition of additionality or impact?
3. Will the procurement satisfy the buyer’s customer, supplier, investor, or internal sustainability requirements?

Those questions are related, but they are not interchangeable.

Who the Zettawatts Additionality RECs Market Fits

Potentially suitable for

• Companies facing supplier clean-electricity requirements or customer procurement expectations.
• Buyers that want a fixed-price certificate commitment without entering into a bilateral VPPA.
• Companies that want to support new renewable projects but do not want direct project-level power-market exposure.
• Renewable project developers looking for a forward REC revenue stream that can contribute to project financing.

Less suitable for

• Buyers pursuing 24/7 carbon-free electricity matching.
• Organizations that require a named project and direct project relationship.
• Buyers that need immediate certificates rather than future-generation commitments.
• Companies with strict geographic requirements that are not compatible with pooled project substitution.
• Organizations unwilling to make a multi-year contractual commitment.

The key question is not whether ARECs are universally better than RECs or VPPAs. It is whether the buyer values fixed pricing, pooled project exposure, and a forward commitment more than direct project control or hourly matching.

Tax-Credit Considerations

Zettawatts announced partnerships with Basis Climate and REOX in December 2023 to help companies use transferable clean-energy tax credits alongside AREC purchases.

Because that announcement is historical, buyers should confirm whether those partnerships and the associated purchasing structure are still available before treating them as a current product option.

Any claim that tax-credit structures can produce “zero bottom-line impact” should also be evaluated with the company’s finance and tax advisers. The tax treatment depends on the buyer’s circumstances and the specific transaction.

Where this leaves buyers

The Zettawatts Additionality RECs Market is designed to address a specific procurement problem: how to make a forward commitment to renewable energy certificates from new projects without taking on the full structure of a bilateral PPA or VPPA.

The model offers simplicity, fixed pricing, and pooled project exposure, but those benefits come with trade-offs. Buyers need to understand replacement rights, geographic requirements, project eligibility, certificate delivery, counterparty exposure, and the definition of additionality used in the contract.

The changing GHG Protocol landscape adds another layer of uncertainty. The proposed Scope 2 revisions are still being developed, and the July 2026 feedback process showed substantial disagreement over hourly matching and deliverability.

Before signing a five- or ten-year AREC contract, buyers should obtain the full contract language, confirm the project’s eligibility criteria, understand the replacement mechanism, verify the certificate-retirement process, and determine how the procurement will be treated under the specific customer or reporting framework that matters to the business.

ARECs may be a useful procurement structure for some buyers, but the value depends on the contract terms and the reporting requirements the buyer actually needs to satisfy.

FAQs

What are Additionality RECs?

Additionality RECs are forward purchases of renewable energy certificates from new projects, typically involving a financial commitment before commercial operation.

Is the Zettawatts AREC Market a VPPA?

No. ARECs are certificate-only forward contracts, while VPPAs are financial contracts linked to a specific renewable project and its power-market economics.

Who uses ARECs?

Companies seeking higher-impact renewable electricity procurement, including businesses responding to supplier requirements, customer expectations, or internal sustainability goals.

Do ARECs meet Microsoft’s 2030 CFE requirements?

Zettawatts says its ARECs are being used by more than 50 Microsoft suppliers. Buyers should verify the current Microsoft Supplier CFE Guidance and their specific eligibility before relying on an AREC purchase.

What happens if an AREC project is not built?

Zettawatts says the contracted volume can be replaced with certificates from another qualifying project. Buyers should review the replacement criteria in the contract.

Are ARECs required for Scope 2 accounting?

No. The current GHG Protocol Scope 2 Guidance does not require additionality for market-based accounting.

Could future Scope 2 rules affect ARECs?

Possibly. Proposed changes have included hourly matching and deliverability requirements, but the final rules have not been published.

Are ARECs the same as 24/7 carbon-free energy?

No. An AREC is a certificate-based procurement structure and does not by itself demonstrate hour-by-hour matching between electricity consumption and carbon-free generation.

References

• Zettawatts — AREC Market FAQ
• Zettawatts — Developers / Additionality RECs
• Zettawatts — 2025 AREC RFP
• Microsoft — Supplier Code of Conduct
• Microsoft — Supplier Carbon-Free Electricity Guidance
• GHG Protocol — Scope 2 Guidance
• GHG Protocol — Scope 2 Public Consultation Feedback Summary
• GHG Protocol — Scope 2 Public Consultation materials
• Ever.green — Microsoft suppliers supporting the Anson County solar project