Energy audit and EİVER obligations in 2026

In Turkey, energy efficiency is no longer an "optional improvement" but a measurable set of legal obligations. Within the scope of the Energy Efficiency Law No. 5627 (EİVER), industrial enterprises of 1,000 TEP and above are obliged to conduct an energy audit, appoint an energy manager and submit the reports through ENVER. In 2026, administrative fines were updated by increasing 25.49% with the 2026/1 notification. Study findings without a measurement and reporting infrastructure cannot be verified during the implementation phase.

Law No. 5627: Who is covered?

EIVER; It covers industrial enterprises, commercial and service buildings, public buildings, electricity generation facilities and organized industrial zones with different thresholds. On the industrial side, the critical threshold is annual total energy consumption of one thousand tons of oil equivalent (TOE) and above. Businesses falling below this band are subject to a different set of obligations; however, ISO 50001, CBAM and customer audits still mandate measurement discipline.

• Industrial business: ≥ 1,000 TOE/year — energy manager + energy audit (every 4 years)
• Public building: ≥ 250 TEP or ≥ 10,000 m² — energy manager + study (every 7 years)
• Commercial/service building: ≥ 500 TEP or ≥ 20,000 m² — survey (every 7 years)
• Electricity generation facility: installed power ≥ 100 MW — energy manager
• OIZ: at least 50 businesses operating in the region — energy manager

How is the 1,000 TEP threshold calculated?

TEP is used to collect different energy carriers (electricity, natural gas, fuel oil, diesel, LPG, etc.) in a single unit. EIVER liability is evaluated based on “total consumption in the last year”; Just looking at the electricity bill is not enough. Process heat, steam boiler, field vehicle fuel and generator consumption should also be included in the inventory.

Example: The sum of 8.5 million kWh of electricity (≈ 731 TEP) + 420,000 m³ of natural gas (≈ 346 TEP) + 80,000 liters of diesel (≈ 68 TEP) annually amounts to approximately 1,145 TEP — falling within the scope of the business energy audit and energy manager obligation. In the calculation, the current table of Ministry conversion coefficients should be taken as basis.

Liability checklist: According to TEP band

Energy audit process: from inventory to verification

Energy study; It is a formal study that consists of information collection, measurement, analysis and reporting stages and determines savings potentials and recovery measures. The survey report is not just a "list of findings"; It should include an implementation plan and verifiable KPIs.

• Inventory: all energy inputs, lines, machines, building envelope
• Metering: main meter (OSOS), sub-meter on critical lines, process data
• Analysis: consumption profile, specific energy (kWh/ton), benchmark
• Recommendation: investment, operation, behavior — cost/benefit order
• Implementation plan: responsible, schedule, budget, expected TOE/kWh savings
• Verification: monitoring of implemented measures with OSOS/meter

Difference between energy audit and ISO 50001

Energy audit is a legal, periodic and project-oriented study; It is renewed at regular intervals and reported to the Ministry. ISO 50001 Energy Management System is the institutional framework that requires continuous PDCA cycle, EnPI monitoring and accredited certification. Study “where is there savings?” answers the question; EnYS asks “how will we make this savings permanent?” manages the question. The two complement each other: study findings enter the Significant Uses of Energy (SES) list, while ISO 50001 institutionalizes the discipline of post-study monitoring.

Certification steps and EnPI definition are explained in detail in our ISO 50001 Energy Management System guide. Our Energy Use Measurement in Industry article on OSOS, sub-metering and 15-minute profile in industry deals with the data infrastructure before and after the study.

Risk of penalties, audit and public support

Administrative fines within the scope of Article 10 of Law No. 5627 are updated with the revaluation rate every year. The 2026/1 notification published in the Official Gazette dated 31 December 2025 will increase the penalties by 25.49% and will be implemented as of January 1, 2026. Amounts vary depending on the type of violation; In serious cases such as violation of the obligation to provide information, the penalty range may increase from hundreds of thousands of liras to millions of liras.

Failure to fulfill obligations is not only a punishment; It may cause disadvantages in energy efficiency support programs, green transformation incentives and public tender scoring. It is critical that pre-audit ENVER records, survey report and OSOS reconciliation are based on the same data set.

ENOPTIMAL: KPI tracking with OSOS after the study

For each measure in the study report, “initial consumption” and “target kWh/TOE” should be defined; After implementation, a monthly comparison should be made with OSOS and submeter data. ENOPTIMAL consumption management module OSOS integration closes the study → application → verification chain by combining invoice verification, reactive alerts and multi-site reporting in a single panel.

Conclusion

Three questions must be answered clearly for 2026 EİVER obligations: (1) How many TOE is our total consumption? (2) Are our energy manager and survey calendar up to date? (3) Do we follow the study recommendations with OSOS? A business that completes this trio reduces the risk of penalties and proves savings investments. By requesting a demo, you can get a TEP account specific to your facility and a post-study monitoring road map.