DISPATCHLOAD_BNC was discontinued on 30 September 2009.

In accordance with the "Arrangements for Managing Risks Associated with Transmission Network Congestion" set of rule changes the Dispatch Binding Network Constraints re-run was discontinued on September 30, 2009.

Source

The occurrences of Over-constrained dispatch (OCD) or binding intra-regional network constraints (BNC) re-runs are ad hoc, with significant dependencies on the configuration or events in the physical power system. Potentially updated every 5 minutes.

DISPATCHLOAD_BNC shows data produced every 5 minutes for all units when they have over-constrained dispatch, with own data being confidential until the next day.

Volume

Rows per day: ~14000

Mb per month: 25% of DISPATCHLOAD

The basis of estimation on the number of rows is on a 25% occurrence rate for BNC runs

Note

A flag exists for each ancillary service type such that a unit trapped or stranded in one or more service type can be immediately identified. The flag is defined as follows: