Southwest Power Pool

Violation Relaxation Limits used in SPP’s 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 SPP’s 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 SPP’s real-time contingency analysis.	2,000