# TEİAŞ Updates Transmission Substation Capacity Allocations for 3,500 MW Renewable Grid Integration

> Turkish Electricity Transmission Corporation (TEİAŞ) and energy regulator EPDK have issued the autumn 2026 capacity allocation review under Decision 14353, publishing updated transformer bay availability across 154 kV and 400 kV substations and fast-tracking transmission line expropriations in Central and Eastern Anatolia.

- **Publish Date:** 2026-10-01
- **Category:** renewable-integration
- **Reading Time:** 5 min
- **Original Source Citation:** [Türkiye Elektrik İletim A.Ş. (TEİAŞ) & EPDK](https://www.teias.gov.tr/duyurular/2026-sonbahar-trafo-merkezi-kapasite-tahsisi-ve-kamulastirma-kararlari)
- **Tags:** TEİAŞ, EPDK, Türkiye Grid, Substation Transformers, 154 kV, 400 kV, Solar Integration, Capacity Allocation
- **Canonical URL:** https://voltformer.com/news/teias-autumn-2026-substation-capacity-allocation-3500mw-renewable-grid
- **Markdown Source:** https://voltformer.com/news/teias-autumn-2026-substation-capacity-allocation-3500mw-renewable-grid.md

## Allocating 3,500 MW Across Transmission and Distribution Substations

Under the framework established by EPDK Decision 14353, Turkey allocated 3,500 MW of non-licensed generation capacity for 2026, comprising 1,500 MW connected at the high-voltage transmission level (TEİAŞ) and 2,000 MW at the medium-voltage distribution level across regional transformer centers.

The October 1, 2026 update details regional transformer headrooms across key renewable zones, capping single-entity connection requests at 75 MW on transmission substations and 10 MW on distribution nodes to prevent capacity hoarding and broaden localized participation.

## Presidential Urgent Expropriations for 154 kV and 400 kV Grid Corridors

To eliminate severe evacuation bottlenecks, presidential emergency expropriation decrees were gazetted for multiple critical transmission corridors connecting Aksaray, Konya, Kocaeli, Nevşehir, Niğde, and Sakarya.

Among priority projects, the 154 kV G24-Van SPP Substation to Özalp Substation transmission line entered active ground construction, establishing vital high-voltage tie-lines to evacuate utility-scale solar generation from eastern Anatolian high-altitude plateaus into the national interconnected network.

## Substation Transformer Hardening and Power Quality Monitoring

TEİAŞ specified that new collector transformer bays must incorporate high-accuracy revenue metering CTs/VTs and class-0.2 power quality monitoring to continuously track total harmonic distortion (THD) and reactive power injection.

This coordinated grid reinforcement ensures that Turkey maintains grid stability and voltage compliance as regional non-hydro renewable penetration approaches 30% of instantaneous national demand.

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