What are renewable energy credits and how do they add solar revenue?
A REC is the environmental attribute of one megawatt-hour. Bundled PPAs, unbundled sales, and state SREC markets can add a second cash-flow stream beside energy.
Beyond the power purchase agreement, U.S. solar projects often earn revenue from renewable energy credits (RECs)—tradable certificates representing the environmental attributes of clean generation. For developers and investors, understanding REC markets is essential to building complete project economics.
What is a REC?
The U.S. Environmental Protection Agency defines a REC as a market-based instrument that represents the property rights to the environmental, social, and other non-power attributes of renewable electricity generation. One REC is typically issued for each megawatt-hour generated and delivered to the grid. When a solar project produces power, it creates both physical electrons and RECs. These can be sold with the power (bundled) or separately (unbundled), depending on offtake structure.
Buyers use RECs to:
- Meet state renewable portfolio standards (RPS)
- Satisfy corporate sustainability commitments
- Demonstrate additionality in clean energy procurement
On a shared grid, RECs are the instrument used to substantiate renewable electricity use claims.
What are SRECs and which states have solar carve-outs?
In states with solar-specific carve-outs—such as New Jersey, Massachusetts, and Maryland—solar renewable energy certificates (SRECs) trade at premiums to generic RECs. SREC revenue can represent a meaningful share of project returns in these markets; prices vary by program and vintage and should be underwritten to the applicable state rules rather than a national average.
Key variables:
- Compliance demand from utilities and suppliers
- Supply from new solar buildout
- Program rules on eligibility, vintage, and banking
Who owns RECs in a bundled PPA vs. a virtual PPA?
In a bundled PPA, the offtaker typically receives both energy and RECs. In unbundled or virtual PPA structures, REC ownership must be explicitly allocated—and valued—in the contract.
Misallocating RECs can undermine compliance claims for corporates and revenue forecasts for investors.
How do lenders treat REC revenue?
Lenders and tax-equity partners treat REC revenue differently depending on contract quality:
- Contracted REC sales with creditworthy buyers support bankability
- Merchant REC exposure requires conservative price assumptions and sensitivity analysis
Our underwriting process models REC revenue explicitly—not as an afterthought.
Are RECs separate from the federal ITC?
Yes. Federal tax credits and RECs are separate value streams. Tax policy—including the phase-out of the ITC—does not create or extinguish REC ownership. As federal credits wind down, contracted REC revenue becomes a more important pillar of project economics.
How Sunlight helps
Sunlight Energy Investments underwrites and operates solar projects across REC markets nationwide. We structure offtake and attribute sales to maximize bankable revenue for investors and developers.
To discuss project economics or REC strategy, explore our advisory services or contact our team.
