The phrase “We use green electricity” can be involved in three different mechanisms in Turkey: rooftop solar power offsetting, physical self-consumption on site and YEK-G (Renewable Energy Resource Guarantee Certificate) amortization. Their invoice impact, EPİAŞ registration and sustainability reporting (Scope 2) results are different from each other. YEK-G; It is the document issued by EPİAŞ for every 1 MWh of renewable energy produced, tracked on the blockchain and redeemed by matching with consumption — the layer of proof that a marketing claim alone is not enough.
01.06.2021
System startup
EPİAŞ YEK-G went live
1MWh
document unit
Certifiable production
12 months
Validity
From the end of the production period
17.12.2024
2024 edit
Charging network + collector scope
YEK-G system: EPİAŞ and EMRA framework
YEK-G system is operated by EPİAŞ (Market Operator) within the scope of EMRA regulations. Certificates are issued for the certifiable production amount in licensed renewable production facilities; Buying and selling can be done in the Organized YEK-G Market. Suppliers, aggregators and — with the current regulation — charging network operators can document through YEK-G redemption and disclosure that they supply a certain amount/rate of renewable energy to consumers or charging service users.
- Export: EPİAŞ registration for certifiable MWh from the production facility
- Trading: Organized YEK-G Market — continuous transaction model
- Redemption: closing the document as “used” by matching it with consumption
- Disclosure: disclosing the type of resource to the consumer via invoice or notification
- Verification: Check via portal with EPİAŞ redemption number
December 2024 edit: charging network, aggregators, green charging
Update of the Renewable Energy Resource Guarantee Certificate Regulation in the Electricity Market published in the Official Gazette on December 17, 2024; It clearly identifies charging network operators as well as supply and collector license holders to the YEK-G system. The charging network operator may declare one or all of its stations as a “green charging station”; In this case, YEK-G redemption is mandatory for the entire consumption subject to the charging service and must be disclosed to the user.
Aggregator license holders can also prove with YEK-G that a certain share of the electricity supplied to consumers comes from renewable sources. Green charging stations are indicated by a separate sign on the free access platform; Redemption notification must be made in the month following the billing period in which consumption occurs, within five business days at the latest from the opening day of the session.
YEK-G vs offsetting vs self consumption
| YEK-G | Settlement (GES) | physical self-consumption | |
|---|---|---|---|
| What does it do? | Documenting the green source claim | Production-consumption invoice balancing | Instant/hourly energy matching in the field |
| Legal basis | YEK-G Regulation, EPİAŞ | Production / distribution without EMRA license | Plant connection, meter |
| Invoice effect | Supplier agreement; separate document cost | Net consumption / delivery cost calculation | Reduces network reception |
| Scope 2 (GHG) | Market-based — redemption + term match | Doesn't count as auto green | Reduces grid consumption; location-based domain |
| Who uses it? | Supplier, aggregator, charging network | Solar + consumption related facility | Roof Solar Power Plant, industrial self-consumption |
Hourly Offsetting As explained in our 2026 guide, offsetting is the netting of production and consumption on an hourly basis through EPİAŞ LÜM; Regulates invoice and delivery direction economy. Offsetting is not enough to say “I purchased green electricity” under TSRS or GHG Protocol. YEK-G amortization, on the other hand, indicates with the official record that consumption is matched with the renewable resource — but the amortized MWh must match the reported consumption period.
Scope 2: location-based vs market-based
Two methods are used for Scope 2 in the GHG Protocol and TSRS 2 climate statements. Location-based: national or regional grid emission factor × kWh consumed — reflects physical reality. Market-based: a low/zero factor can be assigned to the “green” portion of consumption through purchase contracts, YEK-G redemption or similar contractual instruments — provided the document is redeemed and not double-counted.
Our guide to Carbon Neutral, Net Zero and Scope 1–2–3 explains Scope 2's industry share and measurement basis. YEK-G is the official tool in Turkey for market-based reporting; Location-based inventory should be kept separately with OSOS and invoice data. TSRS 2 expects consistent disclosure of both methods.
Greenwashing risks
- Green claim with unredeemed or expired (cancelled) document
- Consumption period and production period mismatch (12 months validity rule)
- Double redemption for the same MWh — system prevents second redemption in the same period
- Thinking that offsetting is automatic YEK-G
- Solar installed power photo ≠ covering report period consumption
- “100% renewable” declaration without supplier disclosure
ENOPTIMAL: verification by production + consumption monitoring
To make the YEK-G claim auditable, three data layers must be aligned: (1) EPİAŞ redemption record and consumer disclosure, (2) periodic electricity consumption (OSOS/invoice), (3) field SPP production profile (settlement or self-consumption analysis), if any. By combining ENOPTIMAL production and consumption modules in a single panel, “how much did we take from the grid, how much did we produce on site, for which MWh was YEK-G amortized?” answers the question.
Conclusion
YEK-G is the official certification mechanism of green electricity supply in Turkey; netting is the billing tool, physical self-consumption is the field reality — the three are not interchangeable. Amortization + consumption reconciliation is essential for Scope 2 market-based reporting, TSRS 2 and customer ESG surveys. By requesting a demo, you can receive a YEK-G and SPP data alignment evaluation specific to your facility.