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The Definition of Renewable Energy Certificate (REC)

A renewable energy certificate (REC) is a market instrument that proves one megawatt-hour of electricity was generated from a renewable source and delivered to the grid.

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Renewable Energy Certificate (REC) definition

Definition of a Renewable Energy Certificate (REC)

A renewable energy certificate (REC) is a tradable instrument that represents the environmental attributes of one megawatt-hour (MWh) of electricity generated from a renewable source, such as wind, solar or hydro. Outside North America, similar instruments are called Guarantees of Origin (GOs) in Europe or I-RECs in many other markets.

How RECs Are Used

When a company buys and retires RECs, it can claim that the electricity it used was renewable. Under the GHG Protocol market-based method, RECs can reduce reported Scope 2 emissions. They do not change location-based Scope 2, which reflects the actual grid mix.

Ways to Buy Renewable Electricity

  • Unbundled RECs: certificates bought separately from electricity.
  • Green tariffs: renewable electricity programs offered by utilities.
  • Power purchase agreements (PPAs): long-term contracts with specific renewable projects, often with RECs included.
  • On-site generation: such as rooftop solar, where the company keeps the RECs.

Example of a REC

A distribution center used 2,000 MWh of electricity in a year. The company bought and retired 2,000 RECs from a regional wind farm, allowing it to report zero market-based Scope 2 emissions for that site, while still disclosing its location-based figure.

Frequently Asked Questions: Renewable Energy Certificates

Is a REC the same as a carbon offset?

No. A REC represents renewable electricity generation, while a carbon offset represents a tonne of emissions avoided or removed.

Do RECs need to come from the same grid?

Under current GHG Protocol guidance, certificates should come from the same market where the electricity is used. Proposed Scope 2 updates may tighten matching rules further.

Can RECs be counted twice?

They should not be. Certificates must be tracked and retired in a registry so only one buyer claims each MWh.

Part of SafetyIQ's EHS glossary: plain-English definitions of workplace health and safety terms.

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