Renewable Energy Certificates (RECs) are the mechanism that allows you to claim renewable electricity even when your power comes from the shared grid. Understanding RECs helps you make informed choices about green power programs and ensures your support actually drives new renewable development.
What Is a REC?
When a wind farm or solar plant generates 1 MWh (1,000 kWh) of electricity, it creates two products: the physical electricity (fed into the grid) and a Renewable Energy Certificate. The REC represents the environmental attributes of that clean generation—the "greenness." RECs can be sold separately from the electricity. When you buy RECs matching your usage, you're claiming that renewable generation for your consumption.
How RECs Support Green Power
REC revenue provides income to renewable generators beyond the electricity they sell. When you buy RECs—through a green power program, community choice aggregation, or direct purchase—you're paying for the environmental benefit. That revenue helps fund new wind and solar projects. REC markets create demand signals that encourage development.
- RECs represent 1 MWh of renewable generation
- Buying RECs claims that generation for your use
- REC revenue supports renewable project economics
- Certified RECs (e.g., Green-e) ensure integrity
Types of RECs
RECs can be sourced from different technologies (wind, solar, geothermal) and regions. Some buyers prefer local RECs to support in-state projects. "Additionality" is a consideration—do your REC purchases fund new projects or existing ones? Green-e certified RECs meet strict standards for transparency and environmental benefit.
Green Power Programs and RECs
When you enroll in a utility green power program, the utility typically purchases RECs on your behalf to match your usage. Your premium pays for those RECs. The utility retires the RECs (so they can't be sold again) and attributes the renewable generation to you. It's a simple, verified way to support green power.
"RECs are the currency of renewable energy claims. When you buy and retire RECs matching your consumption, you're ensuring that renewable generation is attributed to your electricity use—and that your dollars support the clean energy market."
RECs vs. Physical Renewable Power
With rooftop solar, you consume your own renewable generation directly. With RECs, you consume grid power but claim equivalent renewable generation elsewhere. Both reduce your carbon footprint. RECs are practical when you can't install solar—they extend green power access to renters, shaded homes, and anyone who prefers a simple opt-in.
Making Sure Your RECs Matter
Choose programs that use certified RECs (Green-e or similar). Prefer programs that source from new or recent projects when possible. Verify that RECs are retired (not resold). Your utility or green power provider should disclose REC sourcing. Transparency ensures your support has real impact.
RECs make green power accessible to everyone. Whether through your utility or a direct purchase, buying RECs is a meaningful way to support renewable energy and reduce your electricity-related carbon footprint.