How often should BA/RSG's review probable contingencies to determine MSSC?

The appropriate frequency for Balancing Authorities (BAs) and Reliability Standard Generator Owners (RSGs) to review probable contingencies to determine the Maximum Sending Seasonal Capability (MSSC) is annually, or every 12 months. This practice ensures that the assessments remain current and accurately reflect changing system conditions and operational capabilities.

Regular reviews are essential because they allow BAs and RSGs to factor in updates in the generation fleet, load forecasts, and transmission system changes. These factors can significantly impact system reliability and performance. By conducting these reviews annually, these entities can ensure that their contingency plans and the corresponding MSSC reflect the most recent operational data and forecasts. This diligence supports the overarching goal of maintaining system reliability and managing risks associated with contingencies effectively.

Other suggested frequencies, such as quarterly or bi-annually, may not provide adequate time for meaningful updates and adjustments based on new data. Continuous evaluation is important, but an annual review strikes the right balance between frequency and thoroughness.