A derogation is a direction from the UR relieving the applicant from its obligation to comply with a technical standard or code which may be required by a licence or by legislation. Derogations are issued in specific circumstances and have a specified duration.
This is for a one year derogation from the requirements of the SONI Grid Code under Metering Code Sub-Code No. 2.1, section 3.3.5 in respect of Unit GT21 at Ballylumford Power Station.