What is the default ramp rate for Western Interconnection interchange schedules?

The default ramp rate for Western Interconnection interchange schedules is established at 20 minutes. This value is significant because it helps maintain system reliability by allowing for a standardized transition period over which generation resources can adjust their output to meet changes in demand or generation schedules. A ramp rate of 20 minutes provides sufficient time for generators to increase or decrease their output in an orderly manner, avoiding sudden fluctuations that could lead to system instability.

This default setting facilitates coordination among various entities operating within the Western Interconnection, ensuring that changes in power flows are managed effectively and that the overall balance of supply and demand is maintained throughout the interconnected network. By establishing a common ramp rate, stakeholders can better predict and manage system responses, thereby enhancing reliability.

The other ramp rate options are not aligned with the established standard for the Western Interconnection, which is specifically set to optimize operational efficiency and reliability across the region.