Imperfections Charge 2020/21 and Reforecast Report 2018/19

22 July 2020

The Regulatory Authorities, in Northern Ireland and the Republic of Ireland, today publish the Imperfections Charge Consultation paper.

SONI and Eirgrid, together the Transmission System Operators (TSOs) for the all-island Single Electricity Market (SEM), control the transmission of electricity and the management of various network constraints.

These network constraints create additional costs within the SEM, as the TSOs are required to allow for such constraints in real time and increase or decrease individual generator’s output of electricity to ensure the balance between supply and demand of electricity is maintained at all times.

Constraint costs are recovered through the Imperfections Charge and this Consultation paper provides an estimate of Imperfection Costs for the 2020/21 tariff year.

This Consultation paper also describes the TSOs’ Reforecast Report for 2018/19 - see appendices below.

Appendix 1: Imperfections Revenue requirement (PDF 1.3 MB)

Appendix 2: Imperfections Reforecast Report (PDF 387 KB)