The Generator Verification Test Capacity (GVTC) for your resource is an important part of data for the planning year. For reporting this information, you will need to know the MISO coincident summer peak for the reporting year.
The date and time of the MISO coincident summer peak can be found on the Resource Adequacy page of the MISO website under PRA Documents for the Planning Year.
More information on GVTC Testing Requirements can be found in the Resource Adequacy Business Practices Manual (BPM-011) Appendix J.