Green Tariffs and RECs for Businesses, Explained
Businesses have two main ways to procure renewable energy for sustainability purposes: buying Renewable Energy Certificates (RECs) to match their usage on paper — a financial and accounting mechanism layered on top of whatever supply contract they already have — or enrolling in a utility green tariff, a special commercial rate program (usually for larger customers) that ties electricity purchase directly to a specific renewable project or supply mix. RECs are simpler and available to almost any size business; green tariffs offer a more direct link to new renewable generation but usually require a minimum usage level and a longer commitment.
RECs: the accounting layer
As we cover in our piece on whether renewable energy plans are actually green, a Renewable Energy Certificate represents proof that one megawatt-hour of electricity was generated from a qualifying renewable source and added to the grid somewhere. A business can buy RECs equal to its annual usage — either bundled into a "green" competitive supply plan or purchased unbundled from a separate REC marketplace — and use that purchase to back a renewable energy claim for its own operations, regardless of what's actually flowing into its specific building. This is the most common and most accessible option: it doesn't require switching utilities, changing physical equipment, or meeting a minimum size threshold, and it can be layered onto virtually any existing electricity contract.
Green tariffs: buying closer to the source
A green tariff is a different mechanism, offered directly by some utilities (and available in both regulated and deregulated markets) specifically for commercial and industrial customers who want a more direct connection to renewable generation than a REC purchase provides. Under a typical green tariff, a large customer signs a special rate schedule that ties its electricity purchase to a specific renewable project — sometimes a project built or expanded specifically because of that contract — for a term that can run considerably longer than a standard supply contract. Because green tariffs are usually structured around large industrial or commercial loads, they typically carry a minimum usage threshold that puts them out of reach for smaller businesses, but for large energy users they offer a more direct, verifiable link between the company's purchase and new renewable capacity than a typical REC purchase.
Why the distinction matters for sustainability reporting
For a company tracking and reporting its energy-related emissions or renewable energy use, how the renewable claim was procured matters, not just whether one was made. RECs are individually tracked and retired in a registry, which makes them straightforward to document as a specific, auditable claim — but because many RECs come from projects that would have been built anyway, they're sometimes viewed as a weaker signal of genuinely new renewable investment. A green tariff arrangement, documented through the underlying utility contract, is often viewed as a stronger claim of "additionality" — new renewable capacity that exists because of the purchase — which is one reason larger companies with public sustainability commitments increasingly pursue green tariffs and direct project contracts alongside, or instead of, simple REC purchases. Reporting frameworks vary in exactly how they treat each method, so a company's sustainability or finance team should confirm which approach fits the specific standard or disclosure it's working against, rather than assuming both are always interchangeable.
Which one fits your business
For most small and mid-sized businesses, buying RECs — whether bundled into a green supply plan or purchased separately — is the practical starting point: it's available at any usage level, doesn't require a long-term commitment beyond a normal supply contract, and directly supports a renewable energy claim. For larger energy users with a sustained annual load and a longer planning horizon, it's worth asking your utility or a competitive supplier whether a green tariff program is available in your market, since it can offer a more direct and often more credible link to new renewable generation than a REC purchase alone.
Frequently asked questions
What's the difference between buying RECs and enrolling in a utility green tariff?
Buying RECs is a financial transaction — a business purchases certificates representing renewable generation elsewhere on the grid to match its usage, with no change to its actual electric service. A green tariff is a special rate program, usually for large commercial or industrial customers, that ties the business's electricity purchase directly to a specific renewable project or renewable-heavy supply mix through the utility itself.
Can a small business buy RECs, or is that only for large companies?
Small businesses can typically buy RECs too, either bundled into a "green" competitive supply plan or purchased separately from a REC marketplace, while green tariff programs are usually restricted to customers above a minimum usage threshold set by the utility.
Do RECs and green tariffs count differently for sustainability reporting?
Both are recognized procurement methods under common corporate reporting frameworks, but they're documented differently — RECs are tracked and retired individually as proof of a specific claim, while a green tariff arrangement is typically documented through the utility contract and the specific project or supply mix it's tied to. A company's sustainability or reporting team should confirm which approach fits the specific standard it's reporting against.
See this on your own bill
Upload your commercial electric bill and Certo reads it for you — a free bill health score, a plain-English breakdown, and whether your rate is competitive.
Tracking usage for sustainability reporting?
Certo for Business keeps a clean history of usage and billing across locations, making it easier to hand your sustainability team the numbers they need.