Date published:
Today, 26 November 2025, the SEM Committee publishes its Decision approving the SEM Testing Tariff rates that will apply to Generator Units Under Test (GUUT) from 1 January 2026.
This decision represents the first significant changes to the testing tariff methodology I-SEM go-live in 2018.
The RAs are continuing to engage with the TSOs as part of their ongoing review. This may result in further changes to the testing tariff methodology from 2027 onwards.
Please direct any queries to Adam Fitzpatrick, afitzpatrick@cru.ie, in the CRU.