GHG Protocol Revisions: What Smart Businesses Must Now Embrace

The Greenhouse Gas (GHG) Protocol is the world’s most widely used framework for measuring and managing corporate emissions. It was established in 1997 by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD). Together, these organizations set out to create a globally acceptable standard for tracking how businesses contribute to climate change.

Since then, the GHG Protocol has become the backbone of nearly every major sustainability reporting framework. The IFRS Foundation’s ISSB standards, the European Sustainability Reporting Standards (ESRS), and the Corporate Sustainability Reporting Directive (CSRD) directly reference it. Furthermore, thousands of companies worldwide now rely on it to structure their climate disclosures. Major revisions are now happening to these protocols.

For sustainability managers in Nigeria, this matters more than ever. Nigeria is among the jurisdictions adopting IFRS S2 into its regulatory framework GHG Protocol, meaning GHG Protocol standards are increasingly tied to local compliance obligations. Therefore, understanding the current revisions is not optional for forward-thinking businesses.

A Brief History of GHG Protocol Updates

To fully appreciate what is changing, it helps to understand where the GHG Protocol has come from. 2001 saw the first publication of the foundational document, the Corporate Accounting and Reporting Standard. Then a revision took place in 2004. That revised edition remains the core reference for corporate GHG inventories to this day.

Over the following decade, the Protocol expanded significantly. 2011 saw the introduction of the Corporate Value Chain (Scope 3) Standard, followed by its Calculation Guidance in 2013. Additionally, a 2013 amendment updated requirements around which greenhouse gases companies must include in their inventories.

The most recent major update before the current overhaul was the Scope 2 Guidance, published in 2015. That guidance became the leading global framework for accounting for electricity-related emissions. However, since 2015, the standards have remained largely static, even as the reporting landscape shifted dramatically around them.

Why a Major Overhaul Is Now Underway

By 2022, it was clear the existing standards needed updating. The GHG Protocol conducted a five-month public comment period starting in November 2022 to gather stakeholder feedback, collecting over 1,400 responses and more than 230 proposals for potential updates. Consequently, the organization launched the most significant revision process in over a decade.

Since September 2024, technical working groups covering Scope 2 and Scope 3 have brought together dozens of energy and accounting experts from academia, government, nonprofits, and private sector organizations from around the world. These groups are working simultaneously to modernize multiple parts of the Protocol. As a result, the revision process is both broader and more ambitious than anything attempted before.

The full timeline runs from 2024 through 2027, with new standards approved and expected to take effect in 2028 or later. Nevertheless, companies that wait until 2027 to act will already be behind. Accordingly, now is the right time to start building the internal systems and data infrastructure these updates will demand.

What Is Changing with Scope 3 Reporting?

Scope 3 emissions are those that occur outside a company’s direct operations, such as in the supply chain or in the use of products sold. They typically represent the largest share of a company’s total carbon footprint, yet they are also the hardest to measure. Consequently, the proposed Scope 3 revisions are among the most significant in the entire update package.

One of the most impactful proposed changes is a new coverage threshold. Currently, the standard states that companies shall account for all Scope 3 emissions without specifying a quantified minimum. Under the proposed revision, companies would need to report at least 95% of required Scope 3 emissions to remain in conformance. This change is to ensure that businesses account for all material emissions sources, not just the convenient ones.

Additionally, the update proposes the creation of a new “Category 16,” which would cover other value chain activities not currently captured in the existing 15 categories. These include facilitated emissions and those linked to licensing activities. While most Category 16 reporting would remain optional, its introduction signals that the Protocol is expanding its scope to reflect modern business models.

Key Changes to Data Quality and Transparency

Beyond coverage thresholds, the proposed revisions also address how emissions data is reported and verified. One notable proposal requires companies to disaggregate their Scope 3 emissions by data type for each category. This tiered reporting approach would improve comparability and transparency across different companies and industries.

Furthermore, the revision process is pushing companies away from spend-based estimation methods and toward more precise, activity-based data. The Protocol is shifting toward greater precision and operational relevance, addressing long-standing challenges like spend-based Scope 3 data and annual averages in Scope 2 electricity use. In practice, this means businesses will need stronger relationships with their suppliers and better data collection systems.

The proposed Category 15 changes also deserve attention. Currently, Category 15 covers financed emissions and applies primarily to investment managers. Under the proposed update, Category 15 would apply to all companies, while certain financial services like insurance and underwriting would move to the new optional Category 16. This broadening of scope means that many Nigerian businesses with investment activities will face new reporting obligations.

Scope 2 Updates: Electricity Emissions Get Stricter

The Scope 2 Guidance, which governs how companies report emissions from purchased electricity, is also under revision. The 60-day public consultation period for the Scope 2 update began on October 20, 2025 and ended on January 31, 2026. This consultation gathered wide stakeholder input on proposed changes to both location-based and market-based reporting methods.

Among the most notable proposed changes is a shift toward hourly matching for renewable energy certificates, rather than annual matching. This means that companies purchasing renewable electricity will need to demonstrate that their clean power use aligns with actual grid supply on an hour-by-hour basis. For Nigerian companies relying on renewable energy claims, this is a significant operational shift.

Until the GHG Protocol communicates otherwise, the existing standards and guidance remain in effect. However, businesses should not interpret this as a reason to delay. Instead, it is an opportunity to begin adapting systems and processes before compliance becomes mandatory.

What These Updates Mean for Nigerian Businesses

Nigeria’s growing alignment with IFRS S2 means that GHG Protocol revisions have real and immediate relevance for local companies. Businesses in sectors such as finance, manufacturing, oil and gas, and fast-moving consumer goods have particular exposure to Scope 3 reporting requirements. Moreover, as global investors and trading partners increasingly demand standardized climate disclosures, Nigerian companies that report credibly will gain a competitive edge.

The 95% coverage threshold for Scope 3 emissions will push companies to map their entire value chains more thoroughly. For many Nigerian businesses, this will require investing in supplier engagement programs and emissions tracking tools. Furthermore, it will create pressure to move beyond rough estimates and build more reliable data pipelines.

Additionally, the proposed expansion of Category 15 means that companies with investment portfolios, including Nigerian banks and asset managers, will need to begin accounting for financed emissions. This is a largely new area of reporting for most African financial institutions. Therefore, starting to build internal capacity and expertise now will give early movers a meaningful advantage.

How to Position Your Business Ahead of the Curve

Sustainability managers who act early will be better placed to meet the new requirements without disruption. First, it is worth conducting an internal gap analysis to identify where current Scope 3 data falls short of the proposed 95% threshold. From there, businesses can prioritize data collection efforts in the categories that contribute most to their overall footprint.

Second, supplier engagement is increasingly non-negotiable. As the Protocol moves away from spend-based estimates, companies will need suppliers to share primary emissions data. Building those relationships now, before formal requirements take effect, will make compliance significantly smoother.

Finally, sustainability managers should monitor the GHG Protocol’s public consultation updates closely. A complete draft standard for public consultation is expected later in the revision cycle, and all stakeholders have the opportunity to provide feedback before the standards are finalized. CSR Reporters will update when that happens. Participating in that process is not only a way to stay informed but also to influence how the final standards are shaped. For Nigerian businesses, having a voice in global standard-setting is both a strategic opportunity and a sign of growing climate leadership.