What is the ramp duration for an interchange Schedule between the Western and TRE Interconnections?

The ramp duration for an interchange schedule between the Western and TRE Interconnections is indeed 20 minutes. This duration is crucial for ensuring that both interconnections can adequately prepare for the transfer of power without causing disruptions or imbalances in the electricity supply.

During this 20-minute ramping period, both interconnections adjust their generation levels to match the scheduled interchange, allowing for a smoother transition. This timeframe is designed to accommodate the operational needs of the grid, including the variability of generation resources and the demand for electricity, thereby ensuring reliability in the interconnected system.

The choice of 20 minutes is consistent with operational standards and practices within NERC guidelines. Understanding this ramp duration is essential for effective grid management and coordination between different interconnections.