3.2 GW of Korean Rooftop Solar Can Now Earn I RECs

Why Two Certificate Systems Exist in Korea and What Each Covers

South Korea's K REC system issues certificates for renewable electricity fed into the grid. They were designed to support the RPS, so certificates go with the electricity that enters the grid and gets traded between generators and obligated power companies. The problem: rooftop solar systems that consume most or all of their generation on site never feed electricity into the grid. They displace grid imports rather than adding grid supply. Under K RECs, this on-site generation earns nothing in certificate terms.

I RECs fill exactly this gap. They are designed for generation consumed on site. They are specifically for the behind-the-meter generation that the domestic K REC system leaves uncertified. South Korea has approximately 3.2 GW of on-site or behind-the-meter solar eligible for I REC issuance, according to the I TRACK Foundation's announcement.

The significance of the April 2025 approval cannot be overstated for commercial solar EPCs with an industrial client base. For the first time, a rooftop installation on a Korean factory, logistics centre, or commercial building that primarily self-consumes its generation can generate certificate revenue on top of the electricity cost savings. For corporate clients with RE100 or SBTi commitments, the I RECs are not supplementary income: they are the documented evidence of renewable electricity consumption that their corporate sustainability reporting requires.

Who Buys I RECs in Korea and Why

According to Northmore Gordon's I REC Korea guide, until now, businesses seeking to meet sustainability goals in South Korea had few effective pathways. K RECs are primarily tied to Korea's RPS and are limited in availability. I RECs now provide a mechanism for Korean companies, and foreign-owned subsidiaries, to document renewable electricity use for RE100 reporting.

Major Korean exporters in electronics, automotive, and chemicals are increasingly subject to supply chain sustainability requirements from European and North American customers. Samsung, SK Hynix, LG Energy Solution, and Hyundai Motor are among the major Korean corporations with public RE100 commitments. I RECs from their own rooftop installations provide the documented evidence for Scope 2 market-based accounting that their corporate commitments require. This demand is not speculative. It is active, funded, and growing.

The I REC market in Korea is in its early development stage: the I TRACK Foundation approved Korea in April 2025, appointing a local issuer and establishing registry infrastructure takes additional months, and as of mid 2026, issuance is beginning to ramp up. At current voluntary certificate prices in the Asian market, I RECs typically trade at USD 1 to 5 per megawatt-hour. The early stage nature is an opportunity for EPCs who move first.

How to Turn This Into a Client Conversation

The conversation is a service conversation with no additional installation required. Contact the corporate sustainability or ESG teams at your largest commercial clients. Ask two questions: does your company have an RE100 or SBTi commitment? Do you have Scope 2 renewable electricity reporting requirements for your global parent? If yes to either, their rooftop installation may now qualify for I RECs that satisfy those reporting requirements.

This conversation positions you as a sustainability advisor, not just an installer. It is a conversation your competitors are almost certainly not yet having, because most EPCs are focused on new installations rather than the revenue potential of their existing installed base. The installed base conversation is faster to close, costs nothing in new installation work, and creates a relationship that increases client retention and referral probability.

For EPCs working in the industrial facilities market in Gyeonggi Province, Ulsan, or the Gumi electronics corridor, the I REC opportunity combines naturally with the rooftop siting reform covered in the KR2 blog. New rooftop installations in these industrial areas come with both a bill savings case and an I REC revenue case, making the total financial proposal significantly more compelling than either argument alone.

Action this week: Identify 3 commercial clients in your installed base whose parent companies have public RE100 or SBTi commitments. Contact their facilities management or sustainability team this week. Introduce I RECs as a new revenue stream from their existing solar installation that can support their corporate renewable reporting. The solar is already installed. This is a service conversation with no additional hardware required.

The Registration Process and What It Requires

Registration is through an I TRACK Foundation appointed local issuer in Korea. The process involves verifying the installation's generation capacity and metering setup, confirming the generation is primarily self-consumed rather than grid-exported, and submitting documentation to the issuer for facility registration. Once registered, the issuer periodically generates I RECs corresponding to the verified self-consumed generation volume, deposited into the building owner's I TRACK account.

A critical technical requirement: the installation must have metering that separately records total solar generation and total grid import or export. A standard smart inverter with generation monitoring typically provides the generation data. The key additional requirement is proof that generation is primarily self-consumed: this typically requires an energy monitor that records both generation and grid consumption simultaneously, enabling the issuer to calculate net self-consumption.

As an EPC, your role is to help the client identify whether their installation qualifies, introduce them to the I TRACK appointed local issuer in Korea, and ensure the installation's metering setup provides the verified generation data the issuer requires. For new installations, specifying a monitoring setup that enables I REC issuance from day one is a straightforward addition to your standard system design.

I RECs vs K RECs: Making the Distinction Clear to Clients

Corporate clients who have heard of K RECs may ask how I RECs differ and why they need a different certificate type. The distinction is clear and important. K RECs are compliance instruments sold by the generator to obligated power companies as proof of renewable generation fed into the grid. They cannot be used by a company to claim renewable electricity use for its own sustainability reporting. I RECs are evidence that the client personally consumed renewable electricity generated on site. A company with RE100 commitments can retire I RECs from their own rooftop solar to demonstrate that a specific quantity of renewable electricity was consumed at their facility, satisfying Scope 2 market-based accounting requirements. This is exactly what RE100 and SBTi frameworks require and what K RECs cannot provide.

Frequently Asked Questions

Q1. What is the difference between I RECs and K RECs for a corporate client?

K RECs are compliance instruments sold by generators to obligated power companies as proof of renewable generation fed into the grid. They cannot be used by a company to claim renewable electricity use for its own sustainability reporting because they represent grid-exported generation, not on-site consumption. I RECs are evidence that the client personally consumed renewable electricity generated on site. A company with RE100 commitments can retire I RECs from their own rooftop solar to demonstrate that a specific quantity of renewable electricity was consumed at their facility, satisfying Scope 2 market-based accounting requirements under RE100 and SBTi frameworks. This is the specific documentation that corporate sustainability reporting requires and that K RECs cannot provide.

Q2. Is the I REC market in South Korea active and liquid right now?

The market is in its early development stage. I TRACK approved Korea in April 2025. Appointing a local issuer and establishing registry infrastructure takes additional months. As of mid 2026, issuance is ramping up but supply is still limited relative to corporate demand. At current voluntary certificate prices in the Asian market, I RECs typically trade at USD 1 to 5 per megawatt-hour, a meaningful but not transformative additional return. The early stage nature is an opportunity: EPCs who help clients register now establish advantageous positions before the process becomes standardised and widely understood. Early movers in any certificate market capture the learning curve advantage that later entrants pay for.

Q3. Can a solar installation earn both K RECs and I RECs?

K RECs and I RECs are mutually exclusive for any given unit of electricity. K RECs are issued for electricity exported to the grid. I RECs are issued for electricity consumed on site. A single solar installation that generates both grid exports and on-site consumption can earn K RECs on the exported portion and I RECs on the self-consumed portion, but neither certificate system overlaps with the other. A system that exports 100 percent to the grid earns only K RECs. A fully behind-the-meter system that consumes all generation on site earns only I RECs. A hybrid system earns both, in proportion to the respective export and self-consumption volumes. The metering data must clearly separate the two volumes for certificate issuance to be valid.

Q4. Who are the most active buyers of I RECs in Korea right now?

Corporate demand for I RECs is concentrated among companies with explicit RE100 commitments and Scope 2 reporting obligations tied to international supply chains. Samsung Electronics, SK Hynix, LG Energy Solution, Hyundai Motor, and POSCO are among the major Korean corporations with public RE100 commitments. Subsidiaries of Apple, Google, and Amazon's Korean supply chain partners are also under pressure to demonstrate renewable electricity use for their global clients' Scope 3 reporting. The immediate opportunity for EPCs is at the industrial facility level: buildings occupied by manufacturing plants supplying RE100 companies are under direct pressure to source renewable electricity for their own operations, and their rooftop solar plus I REC registration is a direct response to that supply chain requirement.

Q5. What metering requirements does an installation need to qualify for I REC issuance?

The installation must have interval metering that separately records total solar generation and total grid import or export. A standard smart inverter with generation monitoring typically provides the generation data. The key additional requirement is proof that generation is primarily self-consumed rather than exported: this typically requires a smart meter or energy monitor that records both generation and grid consumption simultaneously, enabling the issuer to calculate net self-consumption. Installations that only record total generation without a corresponding consumption measurement may need an additional energy monitoring device. Confirm the specific metering requirements with the I TRACK appointed local issuer in Korea before proceeding with registration, as requirements can evolve as the local registry infrastructure matures.

Q6. How do I RECs interact with the transition from K RECs as the RPS ends?

The K REC phase out and the I REC availability are two separate market developments that happen to coincide beneficially for commercial rooftop solar EPCs. As K RECs wind down and the compliance-driven demand that supported them disappears, I RECs serve a completely different market: the voluntary corporate sustainability market driven by RE100 and SBTi commitments rather than government RPS compliance. K REC demand will continue declining through 2026 as the RPS ends. I REC demand will grow as more Korean companies formalise their RE100 commitments and require documented renewable electricity evidence. The two certificate systems are not substitutes for each other; they serve different markets and different purposes. The EPC who understands both can offer clients a complete picture of the certificate revenue landscape.

Sources

• I TRACK Foundation , trackingstandard.org , South Korea approved for I REC(E) issuance, April 2 2025, 3.2 GW eligible
• Northmore Gordon , northmoregordon.com , I RECs in Korea: A practical guide for corporate buyers and solar owners (August 2025)
• CNERG , cnerg.net , I RECs in Korea: What corporate buyers need to know