S E P T E M B E R 2 9 , 2 0 1 4 | V R W G

Steven WeaverM A N A G E R , O P E R A T I O N A L P E R F O R M A N C E , T R A I N I N G A N D I N T E G R A T I O N

Review of Existing Procedures

Curtailment Procedures and Priority

2

Minimum Generation – Post Wind Integration

• CROP.25005 Minimum Generation

• Minimum Generation Emergency– Software will dispatch Generators to Emergency Minimum– Day-Ahead transactions can be curtailed– If the above actions do not mitigate the Minimum

Generation Emergency, non-dispatchable Generators may be reduced. (Wind is curtailed here)• In economic order using a bid de-stacker to EmerMin• Pro rata curtailment where prices are identical• Some latitude for inter-temporal constraints and system

capacity• No wind has been curtailed for a Minimum Generation

Emergency condition, post wind integration.

3

Transmission Curtailment – Post Wind Integration• SOP-RTMKTS 0060 0020 Monitor System Security

– Dispatchable generators to Economic Minimum– Deny Real-Time only Self Schedule Generators– Deny Day-Ahead Self Schedule Generators pro-rata– May be modified for any of the following

• Thermal constraint sensitivity• System and area capacity• Minimum run and minimum down times• Other reliability concerns (i.e. voltage performance, stability)

– Language added to SOP detailing process for making pro rata generator curtailments