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Carbon Offsets vs. RECs: How They Impact Your Sustainability Strategy

RECs vs offsets.


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Closing the Carbon Market Gap Webinar
Closing the Carbon Market Gap

According to Bank of America, carbon offset supply may need to grow as much as 50x by 2050 to achieve net-zero emissions. Watch the replay as three experts discuss efforts to close this gap and the challenges in developing projects and issuing credits at scale.

Exploring the differences between carbon offsets and RECs, their respective roles in reducing GHG emissions, and their implications for a company’s sustainability strategy.

In today’s world, organizations are placing a greater emphasis on sustainability and reducing their greenhouse gas (GHG) emissions. Consequently, many companies are utilizing carbon offsets and Renewable Energy Certificates (RECs) as tools to achieve their sustainability goals. This blog post will delve into the fundamental distinctions between carbon offsets and RECs, highlighting the importance of understanding these differences for organizations striving to make informed decisions regarding their sustainability strategies. Furthermore, we will explore how these two mechanisms can be strategically integrated to create a comprehensive, effective emissions reduction plan for businesses of all sizes.

What Are Carbon Offsets?

Carbon offsets represent verified emissions reductions stemming from projects that reduce, remove, or avoid GHG emissions. These offsets allow organizations to counterbalance their emissions and work towards carbon neutrality. Quantified in metric tons of carbon dioxide equivalent (CO2e), offsets stem from diverse projects such as renewable energy, energy efficiency, reforestation, improved forest management (IFM), and methane capture. To maintain integrity, offsets must meet criteria like additionality and undergo third-party verification. Carbon offsets can play a role in the reduction of an organization’s GHG emissions across Scopes 1, 2, and 3 in their inventories and reporting, enabling organizations to claim carbon neutrality or reduced emissions while working to reach net-zero targets.

What Are Renewable Energy Credits (RECs)?

RECs are a type of Energy Attribute Credit (EAC) that represent the environmental attributes of renewable electricity generation. These certificates enable organizations to support the growth of renewable energy and claim renewable electricity usage. Each REC represents one megawatt-hour (MWh) of renewable electricity generated from solar, wind, geothermal, and biomass sources delivered to the electricity grid. RECs are certified and tracked by reliable systems such as PJM EIS’s Generation Attribute Tracking System (PJM-GATS), New York Generation Attributes Tracking System (NYGATS), the European Energy Certificate System (EECS), and the International REC Standard (I-REC), ensuring their validity and preventing double counting. They contribute to reducing an organization’s Scope 2 GHG emissions in corporate inventories and reporting. There are typically two approaches to Scope 2 carbon accounting: location-based and market-based methods, with RECs being accounted for in the market-based approach.

RECs serve as a vital accounting tool for all claims related to renewable electricity usage, irrespective of the purchasing method or consumption pattern. Organizations have the option to acquire RECs either bundled with the physical electricity they consume or as a separate, independent purchase that can be matched with their electricity consumption. In either case, by purchasing and retiring RECs, organizations can clearly claim the use of renewable electricity or a specific percentage of their energy consumption as renewable.

Comparing Carbon Offsets to RECs

Below is a chart illustrating the key differences between carbon offsets and RECs, highlighting their unique roles in shaping businesses’ sustainability strategies. The chart provides a comprehensive comparison of these two essential tools, offering insights into their applications, benefits, and potential impact on organizations’ overall sustainability efforts:

Carbon Offsets vs. RECs: Comparing Their Contributions to Your Sustainability Strategy
AspectCarbon OffsetsRECs
Unit of MeasureMetric tons of CO2 or CO2eMegawatt hours (MWh)
SourceCarbon emissions reduction projectsRenewable electricity generators
PurposeRepresent GHG emissions reductionsConvey use of renewable electricity
GHG ReportingReduce/offset Scopes 1, 2, or 3Lower market-based Scope 2 emissions
Consumer ClaimsReduced or avoided GHG emissionsUse of renewable electricity
Additionality TestRequiredNot required

Skip the RFP—CarbonBetter can help

CarbonBetter Certified Offset Portfolios allow carbon buyers to participate in a variety of projects, geographies, and technologies in one simple transaction rather than navigating a lengthy and complex RFP process with multiple carbon market participants.

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Leveraging Carbon Offsets and RECs for Sustainability

Understanding the differences between carbon offsets and RECs is crucial for organizations aiming to make informed sustainability strategy decisions. While both tools help reduce GHG emissions, carbon offsets address direct and indirect emissions, whereas RECs focus on indirect emissions from purchased electricity. Carbon offsets are deducted from total emissions to calculate net emissions, while RECs contribute to market-based Scope 2 emissions calculations based on the renewable generation's emissions factor.

When making public claims, organizations should be mindful of guidelines such as the Federal Trade Commission's (FTC) Green Guides, which ensure that companies make accurate marketing claims about their eco-friendly products and services, thereby preventing misleading communications to consumers and investors.


Carbon offsets and RECs are invaluable resources for businesses striving to reduce their emissions footprint and support sustainability initiatives. Understanding the fundamental differences between these mechanisms allows organizations to make informed decisions regarding their use and ultimately achieve their sustainability goals. If you have questions about utilizing carbon offsets and RECs to help your organization reach its sustainability goals, please do not hesitate to contact us and get started today.

How can my organization effectively incorporate both carbon offsets and RECs into our sustainability strategy?

To effectively incorporate both carbon offsets and RECs, start by assessing your organization's current emissions and energy consumption. Then, set clear sustainability targets and goals. Use carbon offsets to address direct and indirect GHG emissions across Scopes 1, 2, and 3, while utilizing RECs to claim renewable electricity usage and reduce Scope 2 emissions. A balanced approach allows for a comprehensive sustainability strategy that considers various emissions sources and encourages renewable energy adoption.

What should we prioritize when choosing carbon offset projects or renewable energy sources for our RECs?

When choosing carbon offset projects, prioritize those with robust third-party verification, high additionality, and measurable impact on GHG emissions reduction. For RECs, prioritize renewable energy sources that align with your organization's sustainability goals and have the most significant potential for reducing emissions in your specific sector or region. In both cases, ensure the projects or sources adhere to the relevant standards and guidelines.

How can my organization ensure our carbon offsets and RECs purchases are transparent and credible?

To ensure transparency and credibility, work with reputable carbon offset providers and REC issuers that adhere to stringent third-party standards and verification processes. Regularly report your organization's progress towards sustainability goals, including information about purchased offsets and RECs, to stakeholders, investors, and the public.

How can we communicate the impact of our carbon offsets and RECs purchases to stakeholders and customers effectively?

Communicate the impact by quantifying the emissions reduction achieved through carbon offsets and RECs purchases and clearly explaining the role each tool plays in your organization's sustainability strategy. Incorporate storytelling to make your message engaging and relatable, using visuals, infographics, and easy-to-understand language in your sustainability reports, marketing materials, and on your website. Ensure that your claims are in line with guidelines like the Federal Trade Commission's Green Guides to avoid misleading communications.

Can our organization reach net-zero emissions by solely relying on carbon offsets and RECs?

While carbon offsets and RECs can play a significant role in reducing your organization's GHG emissions and supporting renewable energy, it's essential to prioritize internal emissions reduction efforts as well. Implement energy efficiency measures, switch to cleaner energy sources, and promote sustainable practices within your organization. Achieving net-zero emissions requires a comprehensive approach that combines internal initiatives with external tools like carbon offsets and RECs.

Dominic Sung

About the Author

Dominic Sung is Director of Business Development for CarbonBetter. He joined the company in 2022 with a focus on growing the Climate Services business by partnering with clients on their sustainability journey to measure, report, and reduce their emissions in a transparent, traceable, and pragmatic way.

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