What term is used to indicate the remaining transfer capability on a transmission network for further commercial activity?

The term that indicates the remaining transfer capability on a transmission network for further commercial activity is referred to as Available Transfer Capability (ATC). ATC is a critical metric in the electric power sector, as it represents the maximum amount of power that can be transferred over a transmission network while ensuring that reliability standards are met. It takes into account the current utilization of transmission assets, any existing contracts, and the operational limits of the network.

Understanding ATC is essential for market participants as it provides insights into how much additional power can be moved across the grid before reaching constraints that could affect the reliable operation of the electricity supply. This information allows for the effective management of transmission resources and helps facilitate competitive electricity markets by allowing players to understand the capacity available for transactions.

The other options refer to different concepts within transmission and operational frameworks: Total Transfer Capability (TTC) represents the total amount of power that can be transferred over a network, subject to reliability limits, while System Operating Limit (SOL) refers to the maximum operating level of the system considering all operational constraints. Transmission facilities limit generally speaks to the physical limitations of specific transmission components, rather than the available capacity for commercial transactions.