Lloyds Shoals/Lake JacksonFERC Relicensing(FERC No. 2336-094)Middle Ocmulgee Regional Water CouncilJune 6, 2019

2

Introduction

Courtenay O’Mara, P.E.Southern Company

FERC Relicensing and Compliance Supervisor

3

Project Location ( )

GA Water Planning Regions Physiography

PiedmontAtlanta

Coastal Plain

Atlanta SCGA

AL

FL

Ocmulgee River Basin

4

Project Boundary

Project Boundary

Georgia Power Project Recreation Facilities

Public/Private Recreation Access

5

Lloyd Shoals Project (FERC No. 2336)

Generating Capacity 18 MW

Number of units: 6 (horizontal, Francis-type)

Max. hydraulic capacity: 620 cfs/unit or 3,720 cfs total plant capacity

Full reservoir storage: 107,000 acre-feet

Normal operating range: 527 to 530 feet

Average annual inflow: 1,732 cfs

Operation mode: Modified run-of-river

Minimum flow: 400 cfs or inflow, whichever is less

Spillway Capacity: 16,770 cfs

6

Project Facilities and Recreation Access

Lake Jackson

Spillway

Auxiliary Spillway

Substation

Powerhouse

Ocmulgee River Park

Lloyd Shoals Park

Tailrace Fishing

Pier

Jane Lofton Public

Access Area

7

Lloyd Shoals Generating Unit Cross-section and Terminology

Lake Jackson / Reservoir

Ocumlgee River

Operating Unit:Turbine, Generator and Shaft

Headworks/Intake

Discharge/Tailrace

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• No storage

• Run-of-RiverInflow = outflow all the time

• Example: old mill sites where steady power was more important than peaking power

• Project purpose: steady power or no power

Reservoir Storage and Effect on OperationsSmall Reservoirs – Run-of-River Operation

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• Some storage

• Water is stored for hours or days

• Inflow ≠ outflow hourly or daily

Reservoir Storage and Effect on OperationsMedium Reservoirs – Modified Run-of-River Operation

• Water is released for the weekInflow = outflow on a weekly basis

• Example:Lake Jackson (useable storage = 74,750 acre-feet)

• Project purpose: power generation

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• Significant storage

• Water is stored for months or yearsInflow ≠ outflow

• Capture flows during high flow periods for use in low flow periods

Reservoir Storage and Effect on OperationsLarge Reservoirs – Storage Operation

https://media.defense.gov/2017/Nov/29/2001849723/-1/-1/0/171129-A-CE999-006.JPG

• Example:Lake Lanier (Useable Storage = 1,087,600 acre-feet)

• Project purposes: power generation, flood control, navigation, and recreation

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Hydroelectric Project Purpose Comparison

Lanier Basin1,040 square miles

Jackson Basin1,400 square miles

Lanier Storage2,554,000 acre-ft

Jackson Storage107,000 acre-ft

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Large Drainage Basin – Small Amount of Storage

Atlanta

Covington

Lawrenceville

McDonough

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518.00519.00520.00521.00522.00523.00524.00525.00526.00527.00528.00529.00530.00531.00532.00

0

500

1000

1500

2000

2500

3000

3500

4000

5/12/2013 5/13/2013 5/14/2013 5/15/2013 5/16/2013 5/17/2013 5/18/2013 5/19/2013

Rese

rvoi

r Ele

vatio

n

Flow

(cfs

)

NORMAL INFLOW

Lloyd Shoals Operations ExampleNORMAL Inflow Week of 1,547 cfs, Average Annual Inflow = 1,732 cfs

Average Annual Inflow (cfs)

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Lloyd Shoals Operations ExampleDROUGHT Period of 313 cfs, Average Annual Inflow = 1,732 cfs

Average Annual Inflow (cfs)

518.00519.00520.00521.00522.00523.00524.00525.00526.00527.00528.00529.00530.00531.00532.00

0

400

800

1200

1600

2000

2400

2800

3200

3600

4000

7/24/2011 8/13/2011 9/2/2011 9/22/2011 10/12/2011 11/1/2011 11/21/2011 12/11/2011

Flow

(cfs

)

Daily Average Inflow (cfs) Hourly Discharge (cfs) Reservoir Elevation (ft)

DROUGHT

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518.00519.00520.00521.00522.00523.00524.00525.00526.00527.00528.00529.00530.00531.00532.00

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

12/19/2015 12/21/2015 12/23/2015 12/25/2015 12/27/2015 12/29/2015 12/31/2015 1/2/2016

Flow

(cfs

)

Daily Average Inflow (cfs) Hourly Discharge (cfs) Reservoir Elevation

Lloyd Shoals Operations ExampleHIGH Inflow Period of 17,544 cfs, Average Annual Inflow = 1,732 cfs

Average Annual Inflow (cfs)

HIGH INFLOW

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Resource Areas Considered by FERC during Relicensing

• Operations • Recreation and Land Use • Terrestrial, Wetland, and Riparian Resources• Rare, Threatened, and Endangered Species• Water Resources • Fish and Aquatic Resources • Geology and Soils• Cultural Resources

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Study Plan Development Schedule

Comments on PAD and SD1,

and Study Requests

Study Plan Meeting

GPC FilesProposed Study

PlanFERC Issues SD2

if Necessary

Comments on

Proposed Study Plan DUE DATE

GPC FilesRevised

Study PlanFile Reply

Comments within 15 days

45

30

90

Nov 5, 2018 Dec 20, 2018 Jan 16, 2019Mar 20, 2019

FERC Issues Study Plan

Determination

No DisputesFirst

Season Studies

30

30

20Apr 19, 2019 May 20, 2019 May 2019-Apr 2020

Notice of Study Dispute

If Necessary

20Jun 10, 2019

Study Dispute Resolution Process

70

Resolution of Study Issues

If Necessary

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Questions