Date published:
Today, 1 July 2026, the Regulatory Authorities (RAs) are publishing a Consultation Paper on the Transmission System Operators (i.e. EirGrid & SONI) ‘Imperfections Charges Forecast Tariff Year 2026/27’ (i.e., 01/10/2026 to 30/9/2027), prior to issuing its final decision on the Tariff Year 2026/27 Network Imperfections Charge.
The purpose of the Network Imperfections Charge is for the TSOs to recover the total expected costs associated with managing the transmission system. SEMO levies the Constraints (Imperfections) Charge on suppliers. The Charge is made up of a number of components, the largest of which relates to Dispatch Balancing Costs (DBC).
In their submission, the TSOs forecast an Imperfections allowance of €796.92 million for the Tariff Year 2026/27, compared to the €790.24 million allowed by the RAs for Tariff Year 2025/26.
The RAs have reviewed the TSOs’ report, and seek stakeholders’ views on any aspect of the proposals and, in particular, on the following:
i. Whether the TSOs’ forecasts of costs and assumptions for Tariff Year 2026/27 are reasonable;
ii. If there are additional actions the TSOs could take to minimise Imperfections Charges;
Responses to this paper should be forwarded to the Market Modelling Group (mmg@cru.ie) and the All-Island Regulation Team (tsc@uregni.gov.uk) by close of business on 24 July 2026.
Following consideration of responses received and further review of the TSOs’ submission, the RAs intend to publish a decision in early September 2026.