The California ISO has received a request from a market participant for historical 2017 Area Control Error (ACE) data, which is no longer available on the ISO’s Open Access Same-time Information System (OASIS). The ISO posts only one year of historical ACE data on OASIS, and encourages interested parties to develop their own processes to facilitate the review and download of data while it is posted on OASIS.
In response to this request, and in its continuing efforts to provide transparency and equal access to public data, the ISO will make this requested 2017 historical ACE data available to review and download at http://www.caiso.com/market/Pages/ReportsBulletins/Default.aspx#specialreports through July 31, 2019 only.
ACE data, as defined in Appendix A of the CAISO tariff, is the sum of the instantaneous difference between the actual net Interchange and the scheduled net Interchange between the CAISO Balancing Authority Area and all interconnected Balancing Authority Areas, taking into account the effects of the CAISO Balancing Authority Area’s frequency bias, correction of meter error, and time error correction obligations.
