20080915 Ver 1_Notice of Deviation from Minimum Flow_20160819

Water Strategy,Hydro Licensing,
DUKEand Lake Serv'uces
ENERGY, Duke Energy
526 S ChUrch Street I EC I 2Y
Charlotte, NC 28202
August 19, 2016
The Honorable Kimberly D. Bose, Secretary
Federal Energy Regulatory Commission
888 First Street, N.E.
Washington, DC 20426
RE- Notification of Deviation From Minimum Flow Requirements
Catawba-Wateree Hydro Project P-2232
Lookout Shoals Development
Dear Secretary Bose:
Duke Energy Carolinas, LLC (Duke Energy) is providing notification of a deviation from
Continuous Flow requirements contained in Appendix E, Section A-2.0 Flow Articles of the
Federal Energy Regulatory Commission (Commission) License for the Catawba-Wateree Hydro
Project (Project) issued November 25, 2015. The subject deviation occurred at the Lookout
Shoals Development of the Project on August 14, 2016.
At 2049 hours on the evening of August 14, 2016, there was a fault on the 1 00-kv line near the
Lookout Tie Substation. The fault tripped the substation which in turn caused the entire station
to go offline. Technicians were called, and at 2215 hours minimum flow Unit A was placed back
online to restore the continuous minimum flow. At 2230 hours, Units 1 and 2 were returned to
service, and Unit 3 was returned to service at 2233 hours. Units 1 and 3 were then put online,
resulting in a total flow release of approximately 2,900 cfs that was continued until midnight,
more than compensating for the missed minimum flow release (See Enclosure 1). At midnight
continuous minimum flow Unit A continued to operate and Unit 1 began pulsing operation.
This event is addressed under Maintenance and Emergency Protocol Abnormal Condition A.2 —
Unscheduled Hydro Unit Maintenance. No environmental impacts were observed and no Large
Water Intake Owners or Downstream Effluent Dischargers were impacted. North Carolina
resource agencies were notified of this event on August 19, 2016 by copy of this letter and
asked if additional consultation is necessary.
Please contact Mark Oakley (704-382-5778; if there are
questions or if further information is needed.
Sincerely,
Jeffrey C. LX65erger, PE
Director, Water Strategy & Hydro Licensing
Duke Energy

Kimberly Bose
Page 2
August 19, 2016
Enclosure
cc w/I enc osurel' Karen Higgins, Nortfi Carolina Department of Environmental Quality
Fred Tarver, North Carolina Department of Environrnental QUality
Chris Goudreau, Nortl-'u Carotin a Wfldlife Resources Commission
Bryan 'rompkins, United States Fish and Wildlife Service
George GaHeher, Duke Energy
Lynne Dunn, Duke Energy
Mark Oakley, Duke Energy
Keith f-inley, Duke Energy
Phil Imragrasne, Duke Energy
Shannon Todd, Duke Energy

Kimberly Bose
Page 3
August 19, 2016
Enclosure 1
Lookout Shoals Development Tailrace Flow on 14 August 2016
Minimum Flow Release Requirement: 80 cfs
Values Less Than Required Minimum Flow Release Highlighted in Red
Date/Time Flow (cfs)
8/14/16 8:00 PM 2972
8/14/16 8:15 PM 2972
8/14/16 8:30 PM 2971
8/14/16 8:45 PM 2971
8/14/16 9:00 PM 29
8/14/16 9:15 PM 38
8/14/16 9:30 PM 47
8/14/16 9:45 PM
8/14/16 10:00 PM 64
8/14/16 10:15 PM 73
8/14/16 10:30 PM 614
8/14/16 10:45 PM 2895
8/14/16 1,1:00 PM 2926
8/14/16 11:15 PM 2958
8/14/16 11:30 PM 2959
8/14/16 11:45 PM 2956