A renewable energy certificate is a verified, tradable certificate representing one megawatt-hour of electricity generated from a renewable source such as solar, wind, geothermal, biomass or hydro. South African businesses buy and retire RECs to prove clean-energy use with registry-backed evidence rather than contractual assurances.
Renewable and non-renewable electricity flow into the same national grid, so it is not possible to trace the electricity a business uses back to a specific source. Think of the grid like a dam filled by multiple rivers. Once the water mixes, you cannot tell which river each drop came from. Electricity behaves the same way.
RECs solve that problem by separating the renewable attribute of the electricity from the electricity itself, so the attribute can be tracked, transferred and claimed. A business purchases and retires those attributes to support ESG reporting and substantiate renewable energy claims.
One REC represents one megawatt-hour of verified renewable electricity. If a registered solar farm generates 850 MWh, the corresponding renewable attributes can be issued as 850 RECs and sold to a corporate buyer. A company consuming 850 MWh can then purchase and retire 850 RECs against that consumption, allowing it to make a verified claim that its electricity use was matched with renewable generation.
Retirement is the step that carries the weight. A certificate sitting in an account has not been claimed by anyone. Retiring it permanently cancels it, which is what stops the same megawatt-hour being counted twice, once by the generator and again by a buyer. Auditors and certification bodies ask for retirement records, not purchase records.
These three instruments are regularly confused, and the distinction matters for reporting. A REC covers electricity. It addresses Scope 2 emissions, which are the indirect emissions from the electricity a business purchases.
A carbon credit represents one tonne of CO2 equivalent reduced, removed or avoided by a project, and it is applied against Scope 1 emissions, direct greenhouse gas emissions from sources that an organisation owns or controls. Carbon credits are the instrument recognised under South Africa's carbon offset regulations.
A guarantee of origin is the European equivalent of a REC. Both represent one megawatt-hour of renewable electricity, and the difference is the market each is used in. South African exporters supplying European buyers are increasingly asked for documentation in that form. The two instruments are complementary rather than competing.
Carbon tax was introduced by the Carbon Tax Act on 1 June 2019 and is administered by SARS. It applies the polluter-pays principle, putting a price on emissions so that firms factor the cost of climate impact into their decisions. As of 2026, the headline rate is R308 per tonne of CO2 equivalent.
Audit-ready reporting sits underneath all of it. Liable entities must substantiate their environmental levy accounts with verifiable greenhouse gas inventory data, and they are subject to scrutiny from both SARS and environmental authorities. Transparent, fully documented emissions figures are what allow complex calculations and tax-free allowance claims to survive an audit.
RECs are not the mechanism that reduces a carbon tax liability. The tax is levied primarily on Scope 1 emission, and it is eligible carbon credits that count towards the offset allowance. What RECs give a business is verified data on the renewable electricity it purchases and the environmental attributes attached to it. That is a separate part of the same reporting picture, and it faces the same scrutiny.
Reporting frameworks such as the Global Reporting Initiative and the IFRS sustainability standards (which now incorporate the former Task Force on Climate Related Financial Disclosures recommendations) give companies a standardised way to report environmental, social and governance performance alongside financial information, and each requires a company to disclose its Scope 2 emissions , GRI further requires naming the methodology behind any market based or renewable energy claim. A power purchase agreement does not, on its own, answer that question, since assurance providers look for the certificate trail behind the contract.
The EU importer is legally responsible for CBAM compliance, but overseas suppliers still carry part of the load, since importers need accurate, verified information about the emissions embedded in what they buy. Embedded emissions cover the direct emissions from production for every CBAM good, and for cement and fertiliser specifically, they also include the indirect emissions from the electricity consumed in production, so a South African manufacturer that can show evidence of renewable supply for that portion, with certificates rather than assertions, hands its European buyer a lower number to declare. Suppliers with high emissions or thin emissions data can expect commercial pressure in the other direction.
Greenwashing is the practice of presenting a company, product or service as environmentally sound when its actual activities do not support the claim. It relies on vague wording and unverified labels rather than any measurable reduction in impact.
Corporate environmental targets now face close public and regulatory attention, and a claim like "we run on clean energy" invites the question of what backs it. A retired certificate, held in a registry with a serial number and a retirement date, answers that question in a way a marketing statement cannot. The safeguards that matter are transparent carbon accounting, strict retirement tracking, and genuine alignment between what a business buys and what it actually consumes.
Generation and registration. A renewable facility generates electricity and registers its production data with an accredited tracking registry such as zaRECs or I-REC. The facility's technology, capacity, location and metering arrangements are recorded at this point.
Issuance and tracking. The registry issues one digital REC per verified megawatt-hour, which contains all that megawatt-hour's attributes such as where it was generated, the type of source it was generated from and when it was generated.
Trading and transfer. RECs are bought, sold or transferred through brokers, direct contracts or an exchange. Businesses can trade RECs on the Fuel Switch Exchange, where each change of ownership is logged to maintain a clear chain of custody.
Retirement and redemption. The final owner permanently retires the certificate against a stated consumption period. The retirement record is what allows the organisation to claim renewable electricity use and report its Scope 2 position accurately.
Fuel Switch records each of these steps on blockchain infrastructure, which means a certificate's history from issuance to retirement is traceable rather than reconstructed after the fact. The platform is built to manage the full REC lifecycle in one place.
Energy attribute certificates track electricity generation to verify environmental claims, and they operate under different frameworks depending on the market.
I-REC(E) is issued under the international I-REC Standard, administered by the I-TRACK Foundation. Each certificate represents one megawatt-hour of renewable electricity, and the standard is recognised in more than 50 countries. It is the route multinational buyers and their group reporting teams generally expect.
zaREC is the domestic South African registry. It functions in the same way as the international certificates but is localised for the South African market, supporting domestic renewable projects and buyers whose claims are made in a South African context.
Time-based I-REC(E) is the newer development. A conventional REC matches annual generation to annual consumption. Time-based tracking matches generation and consumption in 30-minute intervals instead. Fuel Switch offers timestamped certificates showing precisely when the clean energy was generated, matched to the same interval of consumption. This capability is still uncommon in the South African market.
REC pricing moves with supply and demand, so a single fixed figure would be misleading. What is useful is knowing what drives the number.
Vintage, meaning the generation date, is one of the strongest factors. A certificate loses value as it ages, because a business reporting on a current financial year wants production from that year. Geographic origin and market liquidity matter too, since areas with limited supply or thinner trading activity can command higher prices. Generation technology creates premiums where buyers have preferences tied to their own commitments or green building requirements. Volume affects the rate. So does time-based granularity, which requires more sophisticated metering on the generator's side and prices accordingly. Underneath all of it, compliance obligations and voluntary corporate commitments set the level of demand.
Four things are worth checking before you commit.
Verification. Is the certificate registry-backed and traceable to a named generating facility through zaRECs or I-REC, or are you being sold an assurance?
Retirement documentation. Will you receive a retirement record your auditor accepts, and can you produce it again eighteen months later? The provider should confirm permanent retirement, so the certificate cannot be resold or double-counted once claimed.
Cost structure. Registry fees, platform fees and minimum volumes vary widely. Pricing should be itemised clearly enough to compare one provider against another.
Auditability. Can the provider show the full chain from generation to retirement, or only the final line?
There is no single centralised public exchange for renewable energy certificates in South Africa, so buyers have traditionally sourced them through bilateral agreements or through intermediaries and brokers. Fuel Switch was built to remove that layer, connecting independent power producers with corporate off-takers directly. Businesses can buy renewable energy certificates or sell them on the platform, with issuance, transfer and retirement recorded on blockchain and integrated with the zaRECs registry and the I-REC standard.
The credentials behind that infrastructure are public. Fuel Switch is an approved platform with the Green Building Council South Africa, a graduate of the UNDP SDG Blockchain Accelerator, and a SET100 company recognised by the German Energy Agency among the top 100 global energy transition startups.
The platform was designed to serve small businesses and individual buyers alongside listed corporates, which is a deliberate departure from a market that was built around large volumes.
Whether you are an independent power producer looking to issue or trade RECs, or a corporate off-taker looking to buy them, Fuel Switch can help.
A renewable energy certificate certifies that one megawatt-hour of electricity was generated from a renewable source such as solar, wind, geothermal, biomass or hydro. In South Africa, RECs are issued through the zaRECs registry or under the international I-REC standard. Businesses retire them against their consumption to support ESG reporting, substantiate clean-energy use, and account for Scope 2 indirect emissions.
RECs can be purchased directly from sellers or through intermediaries and brokers. Fuel Switch provides a marketplace connecting renewable energy producers with businesses, which removes the broker layer. Here you can register a site, issue and trade RECs, and retire them. Retirement generates the documentation your auditor or certification body will ask for.
A REC represents one megawatt-hour of renewable electricity and addresses Scope 2 emissions, the indirect emissions from purchased electricity. A carbon credit represents one tonne of CO2 equivalent reduced, removed or avoided by a project, and is applied against Scope 1 direct emissions. Carbon credits qualify under South Africa's carbon tax offset allowance. RECs do not. The two are complementary instruments.
I-REC is the international certificate standard, administered by the I-TRACK Foundation. I-REC(E) is the product code designated specifically for electricity, at one certificate per megawatt-hour. Fuel Switch also supports time-based I-REC(E), which provides the time in which a REC was generated.
For a small business without the capital for onsite solar, RECs offer an accessible way to back electricity consumption with verified renewable generation, meet client sustainability requirements, and reduce greenwashing risk without a large upfront investment. The barrier was never the certificates but the minimum volumes and registry fees around them. Whether they are worth it depends on your reporting obligations, client expectations and budget.