Southwest Power Pool

Violation Relaxation Limits used in SPPs Security Constrained Economic Dispatch

Effective February 1, 2007

Constraint Type

Description

Penalty Price [$/MW]

Resource capacity (Min/Max) limits

The minimum and maximum MW dispatchable output of a resource as indicated by resource plans and a/s capacity plans.

100,000

System energy balance

Energy needed to balance resources and load.

50,000

Resource ramp rates

The ramp capability of a resource as indicated in the resource plan.

5,000

Pnode constraints

A MW limit that can be imposed on SPP related to MW flow across a market node.

2,000

Manual constraints

A MW limit that can be imposed on SPP related to MW flow across a manually-identified transmission constraint.

2,000

Watch List constraints

A MW limit that can be imposed on SPP related to MW flow across a constraint identified by SPPs simultaneous feasibility studies.

2,000

Flowgate constraints

A MW limit that can be imposed on SPP related to MW flow across a defined flowgate.

2,000

RTCA constraints

A MW limit that can be imposed on SPP related to MW flow across a transmission constraint identified by SPPs real-time contingency analysis.

2,000