YEKDEM
YEKDEM is Türkiye's Renewable Energy Resources Support Mechanism: after a project's netting settles energy supplied to the grid against energy drawn from it, its regulation obliges the assigned supply company to purchase the remaining surplus at a YEKDEM-referenced price for the facility's first ten years of operation, and at a reduced, capped rate afterward.
YEKDEM (Yenilenebilir Enerji Kaynaklarını Destekleme Mekanizması, the Renewable Energy Resources Support Mechanism) is Türkiye's purchase-guarantee scheme for renewable electricity. Article 5(2) of the Elektrik Piyasasında Lisanssız Elektrik Üretim Yönetmeliği (12 May 2019, Official Gazette No. 30772) brings surplus energy from unlicensed generation, including rooftop çatı GES, within YEKDEM's scope, and obliges the project's assigned supply company (GTŞ) to purchase that surplus for ten years from commissioning.
Netting and YEKDEM are sequential rather than competing mechanisms. A project first settles the energy it supplies to the grid against the energy it draws from it. Since 1 May 2026 that settlement is hourly for non-residential facilities (saatlik mahsuplaşma); the residential mesken subscriber group kept monthly settlement. Whatever surplus remains after that settlement, the ihtiyaç fazlası, is what the assigned supply company is obliged to buy under YEKDEM-referenced pricing, at a basis the President sets by decision and that varies by facility category. Small residential rooftop subscribers are purchased at a single active energy price, while other facility types are purchased at the current YEKDEM price for the relevant plant category. Once a facility passes its ten-year YEKDEM period, Presidential Decision No. 11415 (Official Gazette No. 33279, 13 June 2026) sets the ongoing basis: 90 percent of the current YEKDEM price for licensed facilities of the same type, capped at the hourly market clearing price (PTF).
Why it matters for solar installers
The common client misconception is not that YEKDEM is irrelevant to a rooftop project, it is that the project is somehow selling electricity into the wholesale market on its own terms. It is not. The regulated, time-limited purchase obligation on the assigned supply company is what actually prices the surplus, and that ten-year boundary, plus its post-year-10 basis, belongs in any proposal that promises a return on exported energy beyond the netted portion.
Common questions
- Does a rooftop solar project ever interact with YEKDEM?
- Yes, indirectly. Article 5(2) of the unlicensed generation regulation places a project's leftover surplus, whatever remains after netting, within YEKDEM's scope, and obliges the assigned supply company to buy it at a YEKDEM-referenced price for the project's first ten years, without the project itself being registered as a market-selling generator.
- How is YEKDEM different from netting for a Turkish rooftop project?
- Netting settles the site's own supply to and draw from the grid against each other, hourly for non-residential facilities since 1 May 2026 and monthly for the residential (mesken) subscriber group. YEKDEM prices whatever surplus is left after that settlement, purchased by the assigned supply company under a regulated basis, so the two apply in sequence to the same project rather than as alternatives.
- What happens to the purchase price after a project's first ten years?
- Presidential Decision No. 11415 sets the post-year-10 basis, purchasing surplus at 90 percent of the current YEKDEM price for licensed facilities of the same type, rounded to two decimals and capped at the hourly market clearing price (PTF).
