I-REC Renewable Energy Certificates Thailand: RE100, EGAT Registration & REC Trading

I-REC (International Renewable Energy Certificate) proves that 1 MWh of electricity was generated from a verified renewable energy source. Administered by the International Tracking Standard Foundation (I-TRACK), it is the global standard for Energy Attribute Certificates (EACs). Different EAC systems exist worldwide: I-REC covers Asia, Africa, Latin America. GO (Guarantee of Origin) covers Europe. REC covers North America. In Thailand, EGAT has been the accredited Local Issuer since 2017. What I-REC proves: a specified amount of electricity came from a verified renewable source — solar, wind, hydro, or biomass. Every 1 MWh generated = 1 I-REC that can be sold or redeemed — see the Complete Factory Solar Guide for solar fundamentals.

Thai factories need I-REC for 5 key reasons: **RE100 compliance**: Over 430 multinational companies committed to 100% renewable electricity, many with Thai factory subsidiaries (Toyota, Honda, Denso, Nestle, Unilever) — I-REC is how they prove compliance in Thailand. **CDP/ESG reporting**: I-REC is accepted by CDP, GRI, RE100, and GHG Protocol Scope 2 market-based method — a standards-compliant ESG instrument. **EU CBAM**: The EU Carbon Border Adjustment Mechanism may require evidence of renewable energy use in production — see ESG & CBAM Guide. **Export buyer requirements**: European, Japanese, and US buyers increasingly require sustainability evidence from Thai suppliers. **Revenue opportunity**: Factories with solar can sell I-RECs as additional income beyond electricity savings — see Solar ROI Calculator.

I-REC and T-VER are completely different systems: **I-REC** tracks the *source* of electricity — 1 I-REC = 1 MWh generated from renewable energy. It answers: "Where did your electricity come from?" **T-VER** tracks *greenhouse gas emission reductions* — 1 credit = 1 tCO2eq reduced. It answers: "How much carbon did you avoid?" **Can you stack both?** Yes — the same MWh can generate both an I-REC and a T-VER credit, but you must disclose both claims. Some reporting frameworks may require choosing one. I-REC prices are lower than T-VER (~17.5-28 THB/MWh vs 80-300 THB/tCO2eq) but registration is much simpler (2-4 months vs 18-24 months) — see T-VER details in the Factory Solar Carbon Credit Guide.

Thai solar I-REC prices dropped from ~$1.81/MWh (Jan 2025) to ~$0.55/MWh (Dec 2025). The market is stabilizing around $0.50-0.80/MWh entering 2026 as renewable supply grows faster than corporate demand. I-REC is a *modest supplementary income* (~1-2% of total electricity savings), not a primary revenue driver. But if you already have solar, registration is straightforward — earning extra from what you already generate. **UGT1**: Thailand's Utility Green Tariff 1 scheme uses I-REC pricing as reference. The 2026 premium is set at ~0.0375 THB/kWh (~$1.19/MWh). See the Solar ROI Calculator to include I-REC revenue in your solar payback calculation.

RE100 technical criteria (April 2025 update) accept I-REC as a valid EAC for Thailand. GHG Protocol Scope 2 has 2 methods: location-based (uses grid emission factor) and market-based (uses EACs like I-REC) — I-REC enables the market-based approach that claims specific renewable sources. **Temporal matching**: RE100 is moving toward hourly matching by 2030; Thailand currently uses annual matching (easier to comply). **Practical example**: A Japanese automotive factory in Eastern Seaboard installs 2 MW solar + buys additional I-RECs to cover remaining grid electricity = 100% RE100 compliance for Thai operations. See the Direct PPA Guide — under a PPA, the PPA provider typically retains I-REC rights.

**Sell if**: You own solar + don't need Scope 2 market-based claims + want to monetize every possible revenue stream. **Buy if**: Your HQ requires RE100 compliance + you can't install enough solar to cover 100% consumption + need quick Scope 2 reduction without capex. **Hybrid strategy**: Use your own solar I-RECs for partial Scope 2 coverage + buy additional I-RECs for the remainder. **Critical rule**: If you redeem I-RECs for your own use, you cannot sell them (no double counting) — you must choose use-or-sell. Decide based on: parent company requirements / ESG reporting framework / solar coverage ratio — see PPA vs EPC Comparison to understand how each financing model affects I-REC ownership.