The ISO plans to implement the EIM Resource Sufficiency Enhancements 1% Threshold in Production on Feb. 15, 2019. The EIM Resource Sufficiency Enhancements will apply a tolerance band threshold to Flexible Ramping Sufficiency Test of 1% or 1 MW thresholds, whichever is greater for each balancing authority area (BAA). Allowing a tolerance threshold of 1% will prevent substantial impact on transfers from sufficiency test failure due to missing the uncertainty requirement by an inconsequential amount.
Section 6.1.3 of the business requirements specification (BRS) document provides examples of the sufficiency test pass/fail outcomes using the tolerance threshold logic. The BRS is available on the ISO website at http://www.caiso.com/Documents/BusinessRequirementsSpecification_EnergyImbalanceMarketResourceSufficiencyEnhancements.pdf. There are no associated technical specifications changes for the 1% Threshold. An additional document was also posted in the Market Operations Business Process Manual (BPM) on Jan. 23, 2019 as emergency PRR 1127.
The 1% Threshold is currently active in Market and Performance (MAP) Stage. ISO customers can utilize the existing California ISO Market Results Interface (CMRI) Flexible Ramp Requirement Sufficiency Test Results in MAP Stage to view the insufficiency percentage or amount to confirm that tests pass/fail according to the logic in the BRS and BPM.
