Eastern, WECC, ERCOT and Quebec

Frequency Events’ Data Summary and

Corresponding Frequency Plots for August 2015

For: NERC Resources Subcommittee and Frequency Working Group

Prepared by: CERTS and Electric Power Group

September 16, 2015

Event Color Definition Description:

EASTERN

Frequency Response can be calculated from NERC SA Actual MW Loss divided by 10* B-A. The results will be in MW/0.1 HZ

NERC INTERCONNECTIONS AUGUST, 2015 FREQUENCY EVENTS – SUMMARY DATA

WESTERN

QUEBEC

ERCOT

Frequency Response can be calculated from NERC SA Actual MW Loss divided by 10* B-A. The results will be in MW/0.1 HZ

NERC INTERCONNECTIONS AUGUST, 2015 FREQUENCY EVENTS – SUMMARY DATA

�� �� � � �� � � � � � �� � �� � �� � �� � � � � � � � � � � !" # $ % &' � ( ) *+ � , -./ � 0 1 2 � 3 4 �� 56 � � 7

�� �� � � �� � � � � 8 8 9 :; � � < ) � � # = �� � � � � 8 > ? ,!" # $ % &' � ( ) *+ � ' , @!" # $ % �' A ( ) *+ � @ , �� �� � � �� � � � � : 9 ?; � � < ) � � # = �� � � � � 8 B , -!" # $ % &' � ( ) *+ � ' , 9!" # $ % �' A ( ) *+ � @ >

�� �� � � �� � � � � - ? -; � � < ) � � # = �� � � � � 8 C - :!" # $ % &' � ( ) *+ � ' , -!" # $ % �' A ( ) *+ � , @�� �� � � �� � � � � - ? -; � � < ) � � # = �� � � � � 8 C - :!" # $ % &' � ( ) *+ � ' , -!" # $ % �' A ( ) *+ � , @ �� �� � � �� � � � � 9 9 @; � � < ) � � # = �� � � � � ? @ : 8!" # $ % &' � ( ) *+ � ' @ >!" # $ % �' A ( ) *+ � , -

� � �� � � �� � � � � , 8 >; � � < ) � � # = �� � � � � ? , : @!" # $ % &' � ( ) *+ � ' ? ,!" # $ % �' A ( ) *+ � ? :� � �� � � �� � � � � , 8 >; � � < ) � � # = �� � � � � ? , : @!" # $ % &' � ( ) *+ � ' ? ,!" # $ % �' A ( ) *+ � ? : �� �� � � �� � � � � : @ B; � � < ) � � # = �� � � � � : , 8!" # $ % &' � ( ) *+ � ' , @!" # $ % �' A ( ) *+ � , C�� �� � � �� � � � � : @ B; � � < ) � � # = �� � � � � : , 8!" # $ % &' � ( ) *+ � ' , @!" # $ % �' A ( ) *+ � , C

�� �� � � �� � � � � 8 ? @ >; � � < ) � � # = �� � � � � 8 B @ @!" # $ % &' � ( ) *+ � ' @ 9!" # $ % �' A ( ) *+ � C ? �� �� � � �� � � � � B > 8; � � < ) � � # = �� � � � � 9 , ?!" # $ % &' � ( ) *+ � ' , ?!" # $ % �' A ( ) *+ � ? B�� �� � � �� � � � � B > 8; � � < ) � � # = �� � � � � 9 , ?!" # $ % &' � ( ) *+ � ' , ?!" # $ % �' A ( ) *+ � ? B

�� �� � � �� � � � � : - >; � � < ) � � # = �� � � � � 8 C , 9!" # $ % &' � ( ) *+ � ' , C!" # $ % �' A ( ) *+ � , : �� �� � � �� � � � � - : C; � � < ) � � # = �� � � � � @ @ @!" # $ % &' � ( ) *+ � ' ? B!" # $ % �' A ( ) *+ � 8 :�� �� � � �� � � � � - : C; � � < ) � � # = �� � � � � @ @ @!" # $ % &' � ( ) *+ � ' ? B!" # $ % �' A ( ) *+ � 8 :

�� �� � � �� � � � � B - 8; � � < ) � � # = �� � � � � @ , >!" # $ % &' � ( ) *+ � ' 8 9!" # $ % �' A ( ) *+ � ? @�� �� � � �� � � � � B - 8; � � < ) � � # = �� � � � � @ , >!" # $ % &' � ( ) *+ � ' 8 9!" # $ % �' A ( ) *+ � ? @ �� �� � � �� � � � � B ? -; � � < ) � � # = �� � � � � - B :!" # $ % &' � ( ) *+ � ' ? B!" # $ % �' A ( ) *+ � , ?�� �� � � �� � � � � B ? -; � � < ) � � # = �� � � � � - B :!" # $ % &' � ( ) *+ � ' ? B!" # $ % �' A ( ) *+ � , ?�� �� � � �� � � � � 8 > @ B; � � < ) � � # = �� � � � � ? @ -!" # $ % &' � ( ) *+ � ' - C!" # $ % �' A ( ) *+ � 8 > @

�� �� � � �� � � � � @ C >; � � < ) � � # = �� � � � � 8 C B @!" # $ % &' � ( ) *+ � ' C 9!" # $ % �' A ( ) *+ � B -�� �� � � �� � � � � @ C >; � � < ) � � # = �� � � � � 8 C B @!" # $ % &' � ( ) *+ � ' C 9!" # $ % �' A ( ) *+ � B -

�� �� � � �� � � � � @ : 8; � � < ) � � # = �� � � � � 8 ? ,!" # $ % &' � ( ) *+ � ' 8 :!" # $ % �' A ( ) *+ � - -�� �� � � �� � � � � @ : 8; � � < ) � � # = �� � � � � 8 ? ,!" # $ % &' � ( ) *+ � ' 8 :!" # $ % �' A ( ) *+ � - - �� �� � � �� � � � � @ B ?; � � < ) � � # = �� � � � � 8 B ? B!" # $ % &' � ( ) *+ � ' - >!" # $ % �' A ( ) *+ � : :

�� �� � � �� � � � � - , @; � � < ) � � # = �� � � � � , B -!" # $ % &' � ( ) *+ � ' - B!" # $ % �' A ( ) *+ � 8 > -�� �� � � �� � � � � � ; � � < ) � � # = �� � � � � 9 8 9!" # $ % &' � ( ) *+ � ' 8 ? ,!" # $ % �' A ( ) *+ � @ C B �� �� � � �� � � � � � ; � � < ) � � # = �� � � � � 8 @ ?!" # $ % &' � ( ) *+ � ' 8 , ,!" # $ % �' A ( ) *+ � @ > @

�� �� � � �� � � � � � ; � � < ) � � # = �� � � � � ' 8 @ > C!" # $ % &' � ( ) *+ � B 9!" # $ % �' A ( ) *+ � ' @ 8 >