RECs vs Carbon Offsets: Which Does Your Business Need?

RECs (Renewable Energy Certificates) address your electricity: one REC proves 1 MWh of renewable power was generated. Carbon offsets address your emissions: one credit compensates 1 tonne of CO₂e. They answer different questions — most businesses with both grid electricity and residual emissions end up needing both.

The difference at a glance

• Unit. REC = 1 MWh of renewable electricity. Offset = 1 tonne CO₂e avoided or removed.
• What it claims. RECs let you report purchased electricity as renewable (Scope 2). Offsets compensate emissions you could not cut, typically residual or value-chain tonnes.
• Standards. RECs sit in energy-attribute registries; offsets are certified by Verra, Gold Standard and similar programmes.
• Where they land in your accounts. RECs change a number inside your inventory. Offsets sit outside it, as compensation for what remains.
• Neither replaces reduction. Both complement — not substitute — cutting consumption and emissions.

What a REC actually is

When a renewable generator puts a megawatt-hour onto the grid, two things are produced: the electrons, which are indistinguishable from any others once they are on the wire, and a certificate recording that the megawatt-hour was renewable. That certificate is the REC, and it is what gets traded, tracked and eventually cancelled on your behalf.

The naming varies by market — RECs in North America, Guarantees of Origin in Europe, I-RECs across much of the rest of the world — but the logic is identical: the environmental attribute is unbundled from the power itself so it can be sold to whoever wants to claim it. That is also the mechanism's main criticism, which we come back to below.

Why Scope 2 is the reason RECs exist

Under the GHG Protocol, companies report Scope 2 emissions two ways:

• Location-based — your consumption multiplied by the average emissions intensity of the grid you sit on. RECs do not change this number.
• Market-based — your consumption adjusted for the energy attributes you have actually contracted for. This is the number RECs move.

This is why a company can truthfully report “100% renewable electricity” while physically drawing the same mixed grid power as its neighbour. It is not dishonest, but it is a market-based accounting claim, and it should be described as one.

Where the criticism lands — and how to answer it

The fair critique of unbundled RECs is additionality: buying a cheap certificate from an already-profitable wind farm may not cause any new renewable capacity to be built. The stronger positions, in rough order of credibility:

1. On-site generation — your own solar or wind, with the attributes retained.
2. Power purchase agreements — long-term contracts that underwrite new build, with the RECs bundled in.
3. Bundled or same-market RECs — certificates from the grid you actually draw from, ideally recent vintages.
4. Unbundled RECs — useful, inexpensive, and the weakest claim of the four. Say so plainly rather than letting a reader assume more.

The same principle governs offsets: what matters is whether your money changed an outcome, and whether you can show it.

Which does your business need?

If your sustainability gap is electricity (Scope 2), RECs are the matching instrument. If the gap is residual emissions across operations and the value chain, certified offsets are. In practice a credible plan stacks them in order: cut consumption first, contract renewable electricity for what you still use, then retire certified offsets against the remainder. Most of what is left after that sits in Scope 3, where neither instrument substitutes for supplier engagement.

One practical warning: never count the same megawatt-hour twice. If a REC has already zeroed the emissions of your electricity in the market-based method, buying offsets for those same tonnes double-counts them. Offsets belong against the emissions the REC did not address.

Where Evertreen fits

Evertreen supplies both, as an intermediary: RECs sourced from third-party renewable projects, and Verra or Gold Standard offsets retired on your behalf with documentation — plus geolocated tree planting for visible, long-term removal. One platform, documented claims, evidence you can hand to an auditor.

Size the problem first with the CO₂ calculator, or work through the full inventory in how to calculate your business carbon footprint.

Frequently asked questions

Do RECs reduce my carbon footprint? They change how your electricity is accounted for under the market-based Scope 2 method. They do not compensate non-electricity emissions — offsets do that.

Can I use RECs and offsets together? Yes, and it is standard practice: RECs for electricity, certified offsets for residual emissions. Just make sure the two are not claimed against the same tonnes.

What is the difference between a REC and a Guarantee of Origin? Mostly geography. RECs are the North American instrument, Guarantees of Origin the European one, and I-RECs cover many other markets. All certify one megawatt-hour of renewable generation.

Are unbundled RECs credible? They are legitimate and widely used, but they are the weakest form of renewable claim because they may not drive new capacity. On-site generation and power purchase agreements are stronger, and worth stating precisely in your reporting.

Does buying RECs make my company carbon neutral? No. RECs only address purchased electricity. Neutrality claims involve your whole inventory, and consumer-facing product neutrality claims based on offsetting face new EU restrictions from September 2026.

Which should I buy first? Neither. Reduce consumption first — it is cheaper than both, and it is the only step that removes the emissions rather than accounting for them.

Does Evertreen sell both? Yes — RECs as an intermediary from third-party projects, and Verra or Gold Standard offsets, alongside traceable tree planting.