New York Independent System Operator
Installed Capacity
Event Calendar
Event Schedule
Legend:
Winter Season Event Summer Season Event Season Change Event

Thursday May 15, 2025
    08:00 AM     IMPORT RIGHTS - First Come First Serve - begin to confirm requests
    08:00 AM     SCR - Aggregation Management Period for Jun Opens
    08:00 AM     SCR - Strike Price Management Period for Jun Opens
    05:00 PM     AFFILIATES - Deadline to select or de-select affiliate names for May ICAP Market
    05:00 PM     IMPORT RIGHTS - First Come First Serve - deadline to confirm requests
    05:00 PM     IMPORT RIGHTS - ISO will announce if Import Rights are fully allocated/returns allowed
Friday May 16, 2025
    08:00 AM     IMPORT RIGHTS - ISO notifies Requestors of Priority and if Import Rights Requests were accepted or rejected
    05:00 PM     IMPORT RIGHTS - ISO posts the remaining available Import Rights
    05:00 PM     SCR - Aggregation Management Period for Jun Closes
    05:00 PM     SCR - RIPs deadline to view and take action on the ACL data requests for Jun
    05:00 PM     SCR - Strike Price Management Period for Jun Closes
Monday May 19, 2025
    05:00 PM     EXTERNAL TRANSACTIONS - Deadline to submit MIS transaction IDs for Import Rights, Exports, and UDRs
Tuesday May 20, 2025
    05:00 PM     GADS - Deadline for Suppliers to submit GADS data for Apr activity
    05:00 PM     IMPORT RIGHTS - External Bilaterals confirmed for MIS transactions IDs received
Wednesday May 21, 2025
    05:00 PM     CERTIFICATION - Deadline for Certification for LSEs and Suppliers for Jun
    05:30 PM     MITIGATION - Default Reference Price
Thursday May 22, 2025
    08:00 AM     SCR - Enrollment Period for auction month of Jul Opens
    08:00 AM     SCR - New Aggregation ID Request Period for Jul Opens
    08:00 AM     SCR - Period Opens for TOs to import/modify add backs for non-provisional resources newly enrolled for auction month of Jul
    05:00 PM     LOAD SHIFT - Deadline for TOs to provide daily load shift (customer switching) for May
    05:00 PM     TRUE UP - Deadline for TOs to provide true-up load shift (actual data) for LSE activity 3 months prior
Friday May 23, 2025
    08:00 AM     SPOT MARKET AUCTION - Offer period opens for Jun Spot Market Auction
    05:00 PM     IMPORT RIGHTS - Allocated Import Rights w/o MIS transaction IDs entered into Spot Mkt Auction @ $0.00
Monday May 26, 2025
    12:00 AM     HOLIDAY - NYISO CLOSED
Tuesday May 27, 2025
    05:00 PM     SPOT MARKET AUCTION - Offer period closes for Jun Spot Market Auction
Wednesday May 28, 2025
    05:00 PM     SCR/EDRP - Deadline to update DRIS contacts to be used for event/test notifications for Jun
Thursday May 29, 2025
    05:00 PM     EXTERNAL TRANSACTIONS - Deadline to submit MIS transaction IDs for ECRs & External Spot awards
    05:00 PM     SPOT MARKET AUCTION - ISO posts results of Jun Spot Market Auction
Friday May 30, 2025
    08:00 AM     IMPORT RIGHTS - First Come First Serve - begin to submit requests
    08:00 AM     SCR - MPs can begin to import Incremental ACL Verification data from Winter 2024-2025
    08:00 AM     SCR - MPs can begin to import Provisional ACL Verification data from Winter 2024-2025
    08:00 AM     SCR - MPs can view and export SCR Load Zone Peak Hours from Winter 2024-2025
    08:00 AM     SCR - RIPs may begin to report resources with partial PTID Sales for Jun in DRIS
    05:00 PM     DMNC - Deadline to submit DMNC data for New Generators to ensure can be used for Jul
    05:00 PM     IMPORT RIGHTS - First Come First Serve - deadline to submit requests
Saturday May 31, 2025
    05:00 PM     IMPORT RIGHTS - Deadline for returns for Jul obligation if ISO announced fully allocated prior to that Certification Period opening
    11:59 PM     AGG ENROLLMENT - Enrollment Period for Jul Closes
    11:59 PM     DMNC - Summer DMNC Out Of Period Test Period Ends
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