PC_2026_E_08 – Public consultation on changes to the harmonised allocation rules and the single allocation platform’s requirements
Contact information
Overview
On 10 June 2026, ACER received transmission system operators' (TSOs') proposals to amend the harmonised allocation rules (HAR) and the requirements for the single allocation platform (SAP).
The harmonised allocation rules apply to all allocations of long-term transmission rights performed in the European Union. They provide specifications for the auctioning of long-term transmission rights (including their use, curtailment and eligibility criteria) and go through a review process every two years. All TSOs issuing long-term transmission rights are required to offer-long term cross-zonal capacity to market participants through the single allocation platform.
Why we are consulting
With the implementation of long-term flow-based allocation, long-term transmission rights for all bidding zone borders within a capacity calculation region will be allocated with a single auction.
Currently, collaterals (i.e. financial security provided by market participants to guarantee their payment obligations) for long-term transmission rights are reserved until the auction is cleared, often leading to an overestimation of collaterals’ needs. As long-term flow-based allocation combines multiple bidding zone borders, this over-reservation further increases collateral requirements for market participants. This, in turn, may result in unnecessary bid rejections by market participants and potential welfare losses.
To address this, TSOs propose to amend the harmonised allocation rules and the single allocation platform's requirements by introducing a new collateral management solution.
To inform its decision-making process and provide stakeholders with the opportunity to share their views, ACER will run a public consultation from 10 July to 7 August 2026.
Consultation documents
Next steps
ACER will take a decision by 10 December 2026.