Renewable Energy Credits (RECs) — What They Actually Do

How Renewable Energy Credits Work

• A REC certifies renewable generation, not renewable delivery. When a wind farm or solar farm generates one megawatt-hour (MWh) of power, an independent tracking system issues one Renewable Energy Credit alongside it. That REC can be sold separately from the electricity itself. The buyer of the REC can then claim the environmental benefit of that renewable generation — even though the grid still delivers the same mixed electrons to their home.
• Green tariffs bundle supply + RECs for a premium. Most 'green electricity' plans offered by suppliers charge a small per-kWh premium (typically 1–3¢/kWh) and use the extra revenue to purchase RECs from renewable generators in your region. The premium is the price of the REC; the supply component is identical to a regular plan. You're not getting 'cleaner' electrons — you're paying to support the existence of renewable generation somewhere on the grid.
• Compliance RECs drive most new renewable build-out. Many states have Renewable Portfolio Standards (RPS) that require utilities to source a specified percentage of their supply from renewables each year. Utilities comply by purchasing RECs, and the demand creates long-term contracts that finance new wind and solar farms. Compliance RECs are the primary economic engine behind most utility-scale renewable development in the United States.
• Voluntary RECs are a separate, smaller market. Voluntary RECs are bought by corporations, universities, and individuals who voluntarily want to claim renewable attributes for their electricity — independent of any state mandate. The voluntary market is a few percent of total REC demand, and prices are typically much lower (often $1–$5 per REC) than compliance RECs ($5–$50 per REC depending on state). Voluntary REC purchases have a much weaker link to actually funding new generation.
• If your goal is impact, target specific projects. Buying generic RECs from the voluntary market supports renewable generation in aggregate, but it does not necessarily pay for new projects to be built. If you want to directly support new renewables, options include: subscribing to a community solar project in your area, signing a long-term PPA (Power Purchase Agreement) with a specific renewable developer, or installing on-site solar with a verified REC retention policy. These are more direct interventions than purchasing voluntary RECs from a green-tariff supplier.

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