How frequently is the CPS-1 12-month compliance factor evaluated?

The CPS-1 (Control Performance Standard 1) 12-month compliance factor is designed to evaluate the performance of generators and other resources in maintaining system frequency over a rolling 12-month period. This evaluation occurs monthly to ensure that any trends or issues in the performance can be identified and addressed in a timely manner.

By conducting these evaluations on a monthly basis, operators are able to monitor compliance with reliability standards more effectively and can implement corrective actions if necessary to meet performance expectations. Waiting longer than a month for the evaluation could delay identification of issues, which could affect the overall reliability of the power system. Therefore, the decision to conduct this evaluation monthly aligns with the proactive approach necessary for maintaining system reliability and performance standards.