The Constraint Reports below present the results of studies for a range of generation scenarios and these indicate the levels of transmission curtailment and constraint that solar and wind generation might experience in the future. These are for controllable wind and solar generators with connections at distribution and transmission level.
These reports are being created to fulfil the requirement of CRU’s ECP-1 decision, CRU/18/058, that system operators carry out system studies to inform generators about possible constraint levels.
The reports were initially shared with the ECP-1 applicants in their respective areas but are now being made publicly available because future constraint levels will be seen by all controllable renewable generators whether they are ECP-1 or not.
Study Assumptions: The values calculated are subject to the study assumptions which are described in detail in the report. Some of the important assumptions relate to forecast demand increase, forecast generation portfolios, forecast delivery of DS3, forecast delivery of transmission reinforcements, forecast interconnector capacity and forecast interconnector trades. In addition, these reports assume an intact network and do not consider the impact of outages of transmission circuits (because these are expected to be temporary in nature, but could have a noticeable local impact during the outages). These reports also take as a study assumption that batteries are to be used for system service provision and not for large quantities of energy trading. Finally, the study scenarios only cover those renewable generators up to and including ECP-1, which means a range of installed renewable generation capacity in Ireland of 4 GW to 9 GW.