TEİAŞ Reports Remaining Distribution-Level Unlicensed Capacity

Substation capacity constraints tighten

Turkish transmission system operator TEİAŞ has published updated headroom figures for unlicensed renewable generation, showing that available distribution-level allocation has dropped to 623.94 MWe across the network. This capacity threshold, equivalent to roughly 624 MW, covers solar and wind assets connecting directly at distribution transformer stations under unlicensed generation rules designed to support industrial self-consumption and commercial auto-producers.

The publish of transformer-level remaining quotas highlights growing technical pressure on local distribution infrastructure. As decentralized solar and wind plants proliferate across industrial zones and rural areas, distribution transformers face increased duty cycles, localized reverse power flow, and heightened voltage step-up stress. System operators must carefully balance incoming connection requests against the thermal rating of power transformers and reverse-feed limiters at primary substations to prevent grid instability.

For generation developers and industrial plants, the dwindling quota signals an urgent transition from easy distribution grid access to more complex connection schemes. Many regional primary substations now show no remaining headroom, forcing prospective sites to consider costlier high-voltage direct interconnections or localized energy storage systems to secure grid access.

Technical implications for substation plant

From an asset management perspective, running distribution transformers near capacity under high intermittent load accelerates thermal degradation of paper insulation and tap changer contact surfaces. Transformer oil analysis, acoustic monitoring, and dynamic load profiling become essential as reverse power flows alter classic substation loading curves. Distribution system operators must also upgrade protection relays to manage bidirectional fault currents, ensuring fast clearance of feeders populated by inverter-based generation.

What this means for asset owners in Türkiye: Industrial facility operators and power engineers in Türkiye must evaluate available transformer headroom at prospective project sites before committing capital to unlicensed self-generation projects. Dwindling capacity at local distribution substations increases the risk of connection delays or enforced curtailment, requiring asset managers to budget for localized energy storage or primary substation protection upgrades during project planning.