---
title: "Türkiye’s Transparency Platform from 1 January 2027: what is added, removed and changed"
url: https://frekansenerji.com/en/insights/transparency-platform-2027-data-list/
lang: en
description: "Under EPDK decision 14968, the Transparency Platform’s mandatory data list grows from 141 to 151 items on 1 January 2027. Outage reporting moves to the new Inside Information Platform and participant-level breakdowns are dropped. We compare the two lists item by item."
datePublished: 2026-10-21
dateModified: 2026-10-21
---

# Türkiye’s Transparency Platform from 1 January 2027: what is added, removed and changed

Under EPDK decision 14968, the Transparency Platform’s mandatory data list grows from 141 to 151 items on 1 January 2027. Outage reporting moves to the new Inside Information Platform and participant-level breakdowns are dropped. We compare the two lists item by item.

Regulation

14 min read · October 21, 2026

## From 141 to 151

With decision 14968 of 15 October 2026, EPDK has redrawn the list of data that must be published on the EPİAŞ Transparency Platform. The decision appeared in the Official Gazette on 20 October, takes effect on 1 January 2027 and replaces decision 10711, which has applied since 2022. The list covers the electricity, natural gas and renewable guarantee-of-origin (YEK-G) markets, and the number of items rises from 141 to 151.

The change looks technical, but it reaches price formation directly. Intraday bids, imbalance forecasts, PPA pricing and investment models all rest on data drawn from this platform. Which data becomes faster, which is aggregated and which is no longer mandatory will leave a mark everywhere from the trader’s screen to the investor’s feasibility study.

151 items

Mandatory data items in the new list; 141 under decision 10711

1 January 2027

Entry into force; decision 10711 is repealed the same day

30 / 50 MW

Outage disclosure threshold: capacity change per facility and per portfolio

1 hour

Deadline to disclose a capacity change on the Inside Information Platform

## Two platforms, two regimes

The decision rests on the Regulation on Transparency and Market-Distorting Behaviour in Energy and Environmental Markets, published on 14 February 2026. The regulation splits market data into two channels. Price, volume and system data stay on the Transparency Platform. Company-specific information that could move prices, such as a plant outage, maintenance or commissioning, will be disclosed on the Inside Information Platform (DBP) operated by EPİAŞ.

Decision 14967, published the same day, sets 19 items of minimum information to be disclosed on the DBP. That is why the outage, planned maintenance and interconnector notices of the old list do not appear in the new transparency list. The information does not disappear; it moves into a disclosure regime backed by fines.

Table 1 Two platforms from 1 January 2027

|  | Transparency Platform | Inside Information Platform |
| --- | --- | --- |
| Legal basis | Regulation art. 6, Board Decision 14968 | Regulation arts. 5 and 7, Board Decision 14967 |
| Content | Price, volume, generation, consumption, transmission and system data | Company-specific information such as outages, maintenance, commissioning and licence events |
| Data provided by | EPİAŞ, TEİAŞ, BOTAŞ, DSİ, EİGM, EPDK, distribution companies | Generation, storage, aggregator, supply, transmission and gas licence holders |
| Timing | Per item: D−1, D, D+1, M+1 … | At most 1 hour for a capacity change |
| Identity | Individual data revealing a participant may not be published (art. 6/4) | Disclosed under the participant’s own name |

The timetable has slipped once. The regulation was originally due to take effect on 1 June 2026; an amendment on 23 May 2026 moved the whole regulation, with no article carved out, to 1 January 2027. The October decisions are aligned with that date.

6 Jan 2022

Board Decision 10711 The 141-item list of data for the Transparency Platform.

9 Jul 2025

Climate Law no. 7552 Market-distorting behaviour ban and administrative fines added to Electricity Market Law no. 6446.

14 Feb 2026

Regulation Transparency and market-distorting behaviour regulation published; entry into force 1 June 2026.

23 May 2026

Postponement Entry into force of the whole regulation moved to 1 January 2027.

20 Oct 2026

Decisions 14967 and 14968 DBP minimum data list and new transparency list in the Official Gazette.

1 Jan 2027

Entry into force New list and DBP obligations start; decision 10711 is repealed.

## Mapping the new list

Of the 151 items, 103 concern electricity and 48 natural gas. On the electricity side the weight is on organised markets: the day-ahead market (GÖP), intraday market (GİP), electricity futures (VEP), balancing power market (DGP), YEK-G, ancillary services, bilateral contracts and imbalance together account for 60 items. Storage appears as a separate category for the first time.

Figure 1 Items per category in the new list

![Frekans Enerji](/_ds/frekans-design-system-4d9ac81c-c3eb-4c27-a344-ef6c4ece4cc2/assets/logos/frekans-full-blue.svg)

Electricity markets

60

Natural gas markets

34

Natural gas transmission

14

YEKDEM

11

Electricity generation

10

Electricity transmission

10

Electricity consumption

9

Dams

2

Electricity storage

1

Number of items. Source: EPDK Board Decision 14968, annex.

We matched the 141 items of the old list one by one against the new list. 56 items stay essentially the same, 71 change in timing, resolution or scope, 8 are dropped entirely and 6 move to the Inside Information Platform. Some of the changes are formal: intraday and futures series are now defined per contract rather than per hour.

Figure 2 Where do the 141 items of decision 10711 go?

![Frekans Enerji](/_ds/frekans-design-system-4d9ac81c-c3eb-4c27-a344-ef6c4ece4cc2/assets/logos/frekans-full-blue.svg)

Essentially unchanged

56

Timing, resolution or scope changed

71

Dropped from the list

8

Moved to the Inside Information Platform

6

Number of items. Old and new lists compared item by item; classification by Frekans. Source: EPDK Board Decisions 10711 and 14968.

Table 2 Main data newly added to the mandatory list

| Data | Source | Publication | What it adds |
| --- | --- | --- | --- |
| Storage: power and capacity in operation | EPİAŞ | Monthly, M+1 | First official series of the storage fleet by technology |
| Installed capacity by source | TEİAŞ | Monthly, M+1 | Installed capacity enters the mandatory list for the first time |
| Final daily consumption programme (KGTP) | TEİAŞ | Hourly, D−1 | Consumption programme notified at the start of the DGP |
| First version of the final daily generation programme (KGÜP) | TEİAŞ | Hourly, D−1 | Shows the gap between the first notification and the final plan |
| Provisional PTF | EPİAŞ | Hourly, D−1 | The first price before the objection period closes |
| Hydro capacity in operation | EPİAŞ | Daily, D+1 | Hydro installed capacity on a daily basis |
| YEKDEM injection (UEVM) and unlicensed generation | EPİAŞ | Hourly, M+1 | Supported generation by source |
| Maximum settlement price (AUF) | EPİAŞ | Monthly, M+1 | Input to the support payment calculation by source |

The provisional PTF, first KGÜP version, AUF, YEKDEM UEVM and unlicensed generation are already published on the platform; what is new is the obligation to publish them. We found no counterpart in today’s API for the storage report, the KGTP or the TEİAŞ installed capacity series.

## Faster data

Balancing data becomes markedly faster. Up-regulation (YAL) and down-regulation (YAT) instruction volumes are today mandatory the next day (D+1) at hourly resolution; under the new list they will be published on the same day (D) per DGP settlement period. Mandatory publication of real-time generation by plant also moves from D+1 to D.

Table 3 Data published faster or at higher resolution

| Data | 10711 (2022) | 14968 (2027) | Change |
| --- | --- | --- | --- |
| YAL and YAT instruction volumes | Hourly, D+1 | Per DGP settlement period, D | One day earlier and finer resolution |
| Real-time generation by plant | D+1 | D | Same day |
| Generation of YEKDEM plants | EPİAŞ, by plant, D+1 | TEİAŞ, by organisation, D | Same day; breakdown moves from plant to organisation |
| Wind generation and forecast | EİGM, daily, 48-hour forecast | TEİAŞ, 15-minute forecast (D−1) and actual (D) | Quarter-hour resolution; actual generation added |
| Public–private bilateral contracts | EÜAŞ, regulated tariff scope, Y−1 | All contracts with EÜAŞ as a party, hourly, D | Wider scope; publication moves from yearly to daily |
| Organised YEK-G prices and matches | Monthly, M | Daily, D | Daily price series |
| Day-ahead block and flexible bids | Daily totals | Hourly; buy, sell, matched and unmatched separately | Bid structure becomes visible |
| Interconnector capacity requests | Auction results, D+1 | Requests and allocation, D−1 | Before delivery |
| YEKDEM installed capacity | M+1 | M | One month earlier |

For the system marginal price (SMF), system direction and real-time consumption the change is mostly formal. The old list set five hours (H+5) for SMF and system direction and two hours (H+2) for consumption; the new list only says “same day”. That is a tighter definition for the last hours of the day and a looser one for the first.

## Slower and aggregated data

Some data, on the other hand, becomes slower or more aggregated. The most striking case is cross-border trade: import and export volumes nominated by market participants are today published before delivery (D−1); under the new list they move to after the end of the month (M+1).

Table 4 Data published later or at a coarser level

| Data | 10711 (2022) | 14968 (2027) | Loss |
| --- | --- | --- | --- |
| Nominated imports and exports | Hourly, D−1 | Hourly, M+1 | Next-day cross-border flows not visible in advance |
| Transmission constraints | Hourly, D+1: constraint YAL/YAT volume, cost, province, period | Daily, D+1: cost of code-1 instructions by city | Hourly constraint volumes no longer mandatory |
| Dam data | DSİ, by plant, D−1 | DSİ, national total, D | Basin- and plant-level hydrology can no longer be tracked |
| Zero-balance adjustment amount | Hourly; code 0 and 1 amounts and volumes | Monthly; component amounts | Hourly cost breakdown lost |
| Market participation status | D+1 | Monthly | Less frequent |
| Licensed plant investments | EİGM, M+1 | EİGM, Y+1, “monthly list” | Text is internally inconsistent; needs clarification |
| Natural gas storage | Cumulative storage level, LNG and underground | Injection and withdrawal; only facilities with more than two shippers | Flows instead of stocks; narrower scope |

Reducing dam data to a national total matters for hydro-heavy portfolios. The fill level of individual reservoirs was a key input to regional generation and price expectations. Total active water and its energy equivalent are enough for the system as a whole, but not for forecasting the behaviour of a single plant or basin.

Ancillary services also need clarification. The new list gives D−2 as the publication time for primary and secondary frequency control prices and volumes; the old list said D−1. We have not seen any change to the timing of the capacity auction. How the wording will be applied will become clear with EPİAŞ’s first implementation.

## What is dropped

Article 6 of the regulation prohibits publishing individual data that reveals a participant’s identity, except where it matters for the market as a whole. The new list applies this principle. Organisation-level day-ahead and intraday matches, participant-level bilateral volumes and hourly imbalance by balance responsible group (DSG) are dropped and replaced by totals.

Table 5 Data dropped from the mandatory list or reduced to totals

| Data | Publication under 10711 | New status |
| --- | --- | --- |
| Day-ahead matches by organisation | Hourly, D+1 | Hourly total only, D−1 |
| Intraday matches by organisation | Hourly, D+1 | Dropped |
| Bilateral contract volumes by participant | Daily, D+1 | Hourly total purchases and sales only, D−1 |
| Hourly imbalance volume and amount by DSG | Hourly, M+1 | Hourly system total and monthly DSG total |
| Planned and unplanned MV distribution outages above 10 MWh | D−1 and D+1 | Dropped |
| Consumption by province and sector | Monthly, M+1 | Dropped |
| Number and consumption of non-eligible consumers | Monthly, M+1 | Dropped |
| Ten-year demand forecast | Yearly, Y−1 | Dropped |
| Supply Price Index | Monthly, M+1 | Dropped |
| Actual net imports and exports | Hourly, H+2 | Dropped as a separate item |

> The new list cuts data on “who did what” and speeds up data on “what is happening in the system”.

Leaving the list does not mean the data disappears at once. EPİAŞ may keep publishing some of these series voluntarily, but after 1 January 2027 it has no obligation to do so. For organisation-level series, the regulation’s explicit ban makes continued publication unlikely. For analyses that read competitor behaviour and portfolio positions from these series, a data source is closing.

## Outage data: from 10 MW to 30 MW

The largest change concerns outage and maintenance notices. Under list 10711, every plant with an installed capacity of 10 MW or more had to report in real time the capacity unavailable because of an outage or unplanned maintenance; these notices appear today among the market messages on the platform.

Under decision 14967 this information moves to the Inside Information Platform and the yardstick changes. The threshold is no longer installed capacity but the change in capacity: 30 MW or more per facility, 50 MW or more per portfolio. The deadline is one hour at most. Events above the threshold are deemed capable of moving prices; failing to disclose them carries a fine of up to 2,509,800 TL at 2026 amounts.

Table 6 Outage and maintenance reporting: old and new rules

|  | 10711 (Transparency Platform) | 14967 (Inside Information Platform) |
| --- | --- | --- |
| Scope | Plants with installed capacity of 10 MW or more | Capacity change of 30 MW or more per facility, 50 MW or more per portfolio |
| Obliged party | Generation licence holders | Generation, OIZ generation and aggregator licence holders; for storage, supply licence holders too |
| Deadline | Real time | At most 1 hour; in all cases before trading in the related product |
| Planned maintenance | By plant, D−1; maintenance programmes M−1 and Y−1 | Once maintenance is confirmed; final annual outage plan as soon as possible |
| Below the threshold | Plants under 10 MW out of scope | Still disclosed under the inside information test if it could move prices |
| Sanction | General sanctions in the legislation | Up to 2,509,800 TL for a disclosure breach (2026 amount) |

The change cuts both ways. A 20 MW partial outage at a large plant will no longer be disclosed automatically, and outages at small wind and solar plants may become invisible. In exchange, every event above the threshold will be disclosed within an hour, with structured fields for facility, MW, start, expected end and cause, and under the risk of a fine. The portfolio threshold also captures multi-site events that stay below the threshold plant by plant but affect the system in total.

We cover the details of the disclosure regime, the market-distorting behaviour bans and the obligations of plant owners in our article “The one-hour rule: Türkiye’s inside information and market abuse regime”.

## What data users should do

For anyone using the platform through its API, 1 January 2027 is a migration date. Intraday, futures and gas series are defined per contract; data models built on an hourly assumption may need to move to a contract key. Reports that rely on dropped series need a fallback source.

Table 7 Data pipeline checklist before 2027

| Topic | Data affected | Action |
| --- | --- | --- |
| Outages and maintenance | Market messages | Move to the DBP data feed; 30 and 50 MW thresholds, update and cancellation records |
| Contract-based series | GİP, VEP, gas spot and futures | Contract key instead of an hourly assumption |
| Dropped series | Organisation-level matches, provincial consumption, demand forecast, Supply Price Index, outages | Fallback source or remove from the model |
| Aggregated series | Dams, constraints, nominated capacity, zero balance | Update publication calendar and resolution |
| New series | Storage report, installed capacity, KGTP, first KGÜP version, 15-minute wind data | Add to the model |

## For investors

The right question is not “is more data coming?” but “is the data I decide on faster and more reliable?”. On the balancing side the answer is yes: same-day YAL and YAT instructions and plant-level generation feed imbalance and intraday strategies. Putting fines behind outage information narrows the information asymmetry; the head start large portfolios gain from their own outages gets shorter.

On the loss side are hydrology, cross-border flows and constraint data. All three were important inputs for investors modelling regional price spreads and constraint risk. Storage investors, on the other hand, get an official storage fleet series for the first time. The pace of competition, the largest uncertainty in battery revenue, can now be tracked monthly and by technology with official data.

In summary

01 The Transparency Platform’s mandatory data list grows from 141 to 151 items on 1 January 2027; decision 10711 of 2022 is repealed the same day.

02 Outage and maintenance notices move to the Inside Information Platform. The threshold changes from 10 MW of installed capacity to a capacity change of 30 MW per facility and 50 MW per portfolio; the deadline is one hour at most and breaches are fined.

03 YAL and YAT instructions will be published per settlement period on the same day, real-time generation by plant on the same day and organised YEK-G prices daily.

04 Nominated imports and exports move from D−1 to M+1; dam data shrinks from plant level to a national total, and constraint data from hourly volumes to daily cost by city.

05 Organisation- and participant-level breakdowns are dropped; system-wide series such as the storage fleet, installed capacity and the consumption programme come in.

At Frekans we produce our monthly Market Outlook reports and plant analyses from Transparency Platform data. Every series these reports use remains on the new list; we are completing the work to move intraday and futures series to the contract-based structure and outage data to the Inside Information Platform before January 2027. For projects at the investment stage we model the coarser dam and constraint data as an additional uncertainty in regional price and constraint scenarios.

## Sources

-   [EPDK Board Decision 14968, 15 October 2026, and annex: List of Data to Be Published on the Transparency Platform (Official Gazette, 20 October 2026, no. 33406)](https://www.resmigazete.gov.tr/eskiler/2026/10/20261020-12.pdf)
-   [EPDK Board Decision 14967, 15 October 2026: Minimum Data to Be Disclosed on the Inside Information Platform (Official Gazette, 20 October 2026, no. 33406)](https://www.resmigazete.gov.tr/eskiler/2026/10/20261020-11.pdf)
-   [EPDK Board Decision 10711, 6 January 2022: List of Data to Be Published on the Transparency Platform](https://www.epias.com.tr/wp-content/uploads/2023/05/seffaflik-platformunda-yayimlanacak-veri-listesi.pdf)
-   [Regulation on Transparency and Market-Distorting Behaviour in Energy and Environmental Markets (Official Gazette, 14 February 2026, no. 33168)](https://www.resmigazete.gov.tr/eskiler/2026/02/20260214-5.htm)
-   [Amendment to the same Regulation: entry into force moved to 1 January 2027 (Official Gazette, 23 May 2026, no. 33262)](https://www.resmigazete.gov.tr/eskiler/2026/05/20260523-1.htm)
-   [EPDK, Guide to Market-Distorting Behaviour, 15 October 2026](https://www.epdk.gov.tr/Detay/DownloadDocument?id=jgfNQ/WtTHA=)
-   [EPİAŞ Transparency Platform API documentation, electricity and natural gas services](https://seffaflik.epias.com.tr/electricity-service/technical/en/index.html)

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