Türkiye Electricity Review 2026

Supporting materials

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Türkiye Electricity Review 2026 (PDF)

Methodology

Installed capacity data

Installed capacity data in Türkiye is obtained from TEİAŞ YTBS (accessible only within Türkiye). Since the data in YTBS may be subject to retrospective revisions, discrepancies may occur between the data presented in the report and the database. This report reflects the data available in the system as of February 2026, when the analysis was conducted.

Hydroelectric capacity factor

When calculating the hydroelectric capacity factor across Türkiye, the total installed capacity of hydroelectric power plants at the end of the previous year is used. For example, the 2025 capacity factor is calculated by dividing the hydroelectric generation in 2025 by the hydroelectric capacity as of December 31, 2024.

Cost caused by drought

The long-term impact of drought on hydroelectric power plants has been calculated, as stated in the report, based on the decline in production over the past 30 years at Türkiye’s three largest hydroelectric power plants: Atatürk, Karakaya, and Keban. The production of these three plants corresponds to between 18% and 68% of Türkiye’s annual hydroelectric generation. Although their share has decreased in recent years due to the increase in installed hydroelectric capacity, these plants have been used as a reference because long-term production data is available for them, as they are the country’s oldest hydroelectric facilities.

The nationwide impact of drought has been estimated by assuming that the production decline observed in these three largest hydroelectric plants over the past 30 years has also occurred in other plants. For this purpose, the share of Atatürk, Karakaya, and Keban dams—22% of total hydroelectric generation over the past 10 years—has been scaled up to 100%. Although different river basins may be affected differently by drought, this assumption has been used considering the long-term decline in water inflows across all basins nationwide.

After calculating the drought-induced production loss for all hydroelectric plants, the cost that would arise if this entire amount were to be met by natural gas power plants has been calculated. In this calculation, the natural gas price from the BOTAŞ tariff for electricity generation as of February 2026 has been used, and plant efficiency has been assumed to be 55%. The increase in natural gas prices due to the global fossil fuel crisis that began on February 28, 2026, has not been taken into account in this calculation.

Battery capacities

Battery capacity in Türkiye has been obtained from the EPDK license database. Data related to pre-licensed and licensed storage-integrated wind and solar power plants in this database has been used. The data in the report was obtained in February 2026. Battery capacity in Europe has been sourced from the European Energy Storage Inventory database, with the data used in the report obtained in December 2025.

In calculating the ratio of battery capacity to installed wind and solar capacity, only grid-scale battery and solar installed capacities have been considered. For more information on this calculation, see the Ember European Electricity Review 2026 report. Total solar capacity in Türkiye (GWAC) is taken as grid-scale solar capacity.