Green tariffs

The short version

A green tariff is a utility-administered program that allows large C&I customers to source renewable energy through their existing utility relationship — without negotiating a direct PPA with a developer. The utility contracts with a renewable energy project, typically a new-build wind or solar facility, and passes the contracted renewable electricity to enrolled customers at a defined rate. Customers receive RECs from the specific project and can make credible additionality claims for sustainability reporting.

Types of green tariff structures

Voluntary green pricing (VGP) programs are the simplest — customers pay a small premium (often $1–3/MWh) above their standard rate to receive renewable energy and associated RECs. These are typically not tied to a specific project and provide weaker additionality claims.

Large customer renewable programs (sometimes called Renewable Energy Tariffs or RETs) are more sophisticated: the utility procures a specific new-build project and offers the output to subscribing customers at the project's LCOE, often with a fixed or lightly escalating rate for the PPA term. These programs provide stronger additionality and more direct price certainty, and are the format most commonly used by Fortune 500 sustainability teams.

Pros and cons versus direct PPAs

Green tariffs offer simplicity, no credit exposure, utility regulatory backing, and access for customers too small to negotiate direct PPAs. You don't need a lawyer to draft counterparty agreements or a trading desk to manage basis risk. The trade-offs are limited negotiating flexibility on price or terms, fewer customization options, and typically lower potential upside than a well-structured direct PPA in a rising price environment.

For mid-market buyers — annual electricity spend of $2–20M — the green tariff is often the right tool. For large industrial buyers spending $50M+ annually with dedicated energy teams, direct PPAs or VPPAs generally offer more value through price customization, longer terms, and the ability to structure basis and shape risk allocations.

Availability and how to evaluate programs

Green tariff availability varies significantly by state and utility. California, the Southeast (Duke Energy, Georgia Power), and the upper Midwest (Xcel Energy) have particularly active programs. Buyers should evaluate: whether the enrolled project is new-build (additionality), the rate structure (fixed vs. variable), REC registry and vintage, minimum subscription size, and what happens to the rate if the utility's underlying PPA costs change. FERC-jurisdictional interconnection and state utility commission approval govern program design — understanding who approved what matters when assessing rate stability.