Comprehensive guide to legislation and government incentives in Turkey, Romania and the EU supporting solar energy projects
The Turkish authorities have issued new legislation that comes into force starting in 2026. The full text and practical interpretation from the CAGLAYAN SOLAR ENERJİ legal and engineering team
«يُلزَم جميع المباني الجديدة ذات المساحة الإجمالية 2,000 م² أو أكثر، التي يتم استصدار رخصة بناء لها اعتباراً من 01/01/2026، بدمج أنظمة طاقة متجددة في التصميم والتنفيذ، تغطي ما لا يقل عن 10% من الاستهلاك الطاقي السنوي المقدّر للمبنى. تشمل الأنظمة المقبولة: الطاقة الشمسية الكهروضوئية (GES)، أنظمة التسخين الشمسي، أنظمة الرياح الصغيرة، أنظمة الطاقة الحرارية الأرضية. يُعتبَر نظام الطاقة الشمسية الكهروضوئية السقفي هو الحل المعياري الموصى به من قبل الجهات التنظيمية لتفوقه الاقتصادي وسهولة تنفيذه.»
The 2026 law does not impose a single solution — but the solution differs radically according to the building type, its electricity consumption, and peak consumption times. Here is a detailed analysis of three common cases we face daily with our clients
التحليل: الاستهلاك منخفض نهاراً (الأسرة في العمل/المدرسة) ومرتفع ليلاً. الفائض النهاري يُصدّر للشبكة عبر عداد صافي الإنتاج (Net Metering).
الحل: نظام On-Grid بدون بطاريات مع عداد صافي — الأرخص والأبسط.
التحليل: أحمال إضافية مرتفعة طوال اليوم: مسبح، مضخات حرارة (Heat Pumps)، شاحن سيارة كهربائية، نظام تكييف مركزي. الاستهلاك الليلي مرتفع بشكل خاص صيفاً.
الحل: نظام Hybrid 10-20 kW مع بطاريات Lithium-ion بسعة 10-20 kWh لضمان استمرار التيار وتشغيل الأحمال الأساسية ليلاً.
التحليل: استهلاك نهاري مرتفع طبيعياً (ساعات العمل 8-10 ساعات). توافق مثالي بين الإنتاج والاستهلاك — معظم الكهرباء تُستهلَك لحظياً.
الحل: نظام ثلاثي الأطوار 50-500 kW، مع خيار إضافة بطاريات فقط لقطاعات حرجة (خوادم، تبريد).
Quick decision: which case suits you? This table summarizes the essential differences between the three systems across 8 decisive criteria
| Criterion | Residential (Home) | Villa | Company (Business) |
|---|---|---|---|
| System type | On-Grid | Hybrid (with batteries) | Three-phase |
| Capacity | 5-8 kW | 10-20 kW | 50-500 kW |
| Battery capacity | None | 10-20 kWh | Optional (critical only) |
| Approximate cost | $5K-8K | $15K-28K | $50K-500K |
| Payback period | 5-7 years | 4-6 years | 3-5 years |
| Annual savings | 60-80% | 70-90% | 75-90% |
| Installation time | 1-2 days | 2-4 days | 2-8 weeks |
| Compliant with 2026 law? | نعم (للمنازل +2000م²) | نعم (مثالي للفيلات الكبيرة) | إلزامي (المستهلك الأكبر) |
Three crucial economic concepts for understanding the feasibility of your project under the 2026 law: current cost, accounting depreciation, and grid settlement. Understand them well before signing any contract.
Refers to the full actual cost of the project at the moment of execution, including: panels, inverters, mounting structures, cables, installation, permits, and grid connection. We calculate it accurately to avoid budget gaps.
مثال عملي:
نظام 10 kW لفيلا = ~€8,000 شامل كل البنود، بدون مفاجآت.
Distributing the system cost over its productive life (usually 10 years for accounting). It reduces taxable profit and recovers part of the investment through tax savings. Crucial for companies to accelerate the real return.
مثال عملي:
مشروع €100,000 = إهلاك €10,000/سنة = توفير ضريبي ~€2,500/سنة (بنسبة 25%).
Net-metering mechanism: the daytime surplus is exported to the grid and counted as credit used at night. Valid for one year. Do not sell surplus electricity cheaply — exchange it with the grid.
مثال عملي:
إنتاج نهاري 40 kWh + استهلاك ليلي 25 kWh = رصيد 15 kWh للشبكة ليوم آخر.
The law is not a burden — but an investment opportunity in itself. The rooftop solar system achieves a 15-25% annual return with payback within 3-7 years (depending on the case), adds 3-5% to the building's value, and protects against future electricity tariff increases. The legal obligation turns into a profitable investment instead of a fine with no return.
Choosing the right battery system is the most complex decision in designing a GES. A battery that is too small = continued power outages. A battery that is too large = wasted money without benefit. Here is the framework we use
Battery capacity = daily night-time consumption × 1.5. Do not pay for capacity you will not use.
LFP: 6,000+ cycles, 10+ years. Lead-Acid: 1,500 cycles, 3-5 years. The price difference is recovered within 2 years.
Protection against overcharging, deep discharge, and cell imbalance. Without BMS = potential fire.
Buy a battery that allows adding modules later. Your needs will change — do not freeze your investment.
The acceptable minimum. Less than that = early replacement that cancels the savings achieved.
LFP cells, 6,000+ cycles, modular scalability, 10-year warranty. The default choice for most of our projects.
Perfect integration with Fronius inverters, advanced BMS, unified monitoring app. Higher price but highest compatibility.
Competitive price, good performance, compatibility with Huawei inverters. We recommend it for projects with limited budgets.
ملاحظة هامة: لا نوصي بأي بطارية بدون BMS متكامل أو ضمان أقل من 10 سنوات، حتى لو كان السعر مغرياً. السلامة والعمر الافتراضي أهم من التوفير اللحظي.
6 in-depth articles we are publishing successively on our blog — each one covers a specific aspect of the 2026-2027 law in greater detail than this general guide
An analytical reading of the official text with an explanation of each legal article in plain language and all exceptions and recent amendments.
A practical accounting guide for each cost item, with ready-to-download Excel spreadsheets that calculate the actual cost for you.
A comparison of different depreciation methods (straight-line, declining, accelerated) and their tax impact on Turkish companies under the 2026 law.
An explanation of the grid settlement mechanism, the financial settlement year, and optimal strategies to maximize the benefit of the surplus.
A simple mathematical equation that determines for you when battery investment is profitable and when it is a guaranteed loss.
A detailed calculation of the expected fines, compared to the cost of the implemented GES system, shows that compliance is much cheaper than violation.
Get a free consultation from the CAGLAYAN SOLAR ENERJİ team within 24 hours. We assess your building, calculate the real cost, analyze the accounting depreciation, and design an integrated GES system for you that turns the 2026 law obligation into an investment. No obligation, no hidden fees.