Upload
martin-evans
View
223
Download
0
Embed Size (px)
Citation preview
Overview of Alabama Power’s Tallapoosa River Operations
Martin Dam Relicensing Informational Meeting
April 1, 2008
Andy Sheppard, P.E.Project Mgr. - Hydro Optimization
What do we want to do today?
Take a brief tour of the river basin and dams
Review project purposes
Special operation issues
Daily operation considerations
Alabama Power Company Hydroelectric ProjectsAlabama Power Company Hydroelectric Projects
APCo RESERVOIR SYSTEMS
Three River Basins Tallapoosa Warrior Coosa
Drainage 3,300 4,200 10,100
Reservoirs 4 3 6
Units 11 4 26
Capacity (MW) 420 280 950
S
N
EW
Tallapoosa River Basin
$
$
$$Yates Dam
Harris Dam
Martin Dam
Thurlow Dam
5.45.0
7.0
5.5
4.23.8
4.8
3.64.4
2.7
3.7
5.2
0
2
4
6
8
1 2 3 4 5 6 7 8 9 10 11 12
MONTH
RAIN
(in
.)Tallapoosa River Basin Average Monthly
Rainfall
PROJECT PURPOSES
HYDRO ELECTRIC POWER Electric System Dynamic Benefits Energy
FLOOD CONTROL
DROUGHT MANAGEMENT
NAVIGATION REQUIREMENTS
RECREATION, FISH AND WILDLIFE
WATER QUALITY
The Reservoirs operated by APCo are different in more than just name and location, they're designed to be operated differently.
APCo operates two types of reservoirs : Run-of-River and Storage
Run-of-River Storage
Tallapoosa Yates, Thurlow Harris, Martin
Warrior Bankhead, Holt Smith
Coosa Lay, Mitchell, Jordan/Bouldin Weiss, Henry, Logan Martin
Furthermore, the dams located on the same river must be operated as a single system
The operations of each dam have an impact on both upstream and downstream reservoirs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time of Day
Genera
tion o
r L
oad
Typical APCo System Load and Hydro Generation during Winter
9,000 MW8,000 MW
7,100 MW
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time of Day
Hydro Generatio
n
Typical APCo System Load & Hydro Generation during Summer
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time of Day
Generatio
n or Load
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Time of Day
Hydro Generatio
n11,000 MW
6,300 MW
0
20
40
60
80
100
120
140
160
1985 1989 1993 1997 2001 2005
% Avg. MWh
Wadley May 2003
Tallapoosa River above Horseshoe Bend May 2003
Flood Control can be defined as reducing river stages DOWNSTREAM of a dam
The people and property located downstream benefit from flood control operations
Run-of-river reservoirs have limited flood control capability; they cannot provide this benefit to the public
Downstream flood peaks are reduced by discharging less water than is coming into the reservoir
Flood control plans are based on studies of significant rainfall events.
Not every flood can be completely controlled; each project has a particular amount of water that it can store
After all flood storage has been used, the project becomes run-of-river
Drought Forecasting
Drought Timetable
Reservoir Impacts
So, how does APCo make the decisions?
Using a consultation process that involves all the regulatory agencies responsible for managing flow and its impacts:
How bad . . . . How long . . . . . How much
License Excerpt for Martin DamFERC Project 349
• Article 12 - The FERC & Secretary of the Army have rights to dictate storage & discharge rules in the interest of navigation, protection of life, health, and property, and in the interest of the fullest practicable conservation and utilization of such waters for power purposes and for other beneficial public uses, including recreational purposes
(paraphrased)
Tallapoosa RiverDaily Reservoir Operations
Automated Rain & Stream Gages
RIVER RAIN STREAM
TALLAPOOSA 15 6
WARRIOR 15 6
COOSA 45 18
HARRIS HYDRO PROJECT Flood Control Guideline
780
782
784
786
788
790
792
794
796
MSL
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Daily & Weekly Load Forecast
Rain Forecast
Inflow Forecast
Lake Level Forecast
Units On-lineMaintenance Plans
Up & Down Stream Lake Levels & Inflows
Lake Activity
Required Min. Discharges
Flood Control Discharges
Operational Issues
Martin Rule Curve Evaluation
• Primary objective of MIG 3 Project Operations Study Plan is to determine feasibility of winter pool change
• Preliminary results of modeling complete, presented today
• Investigated early implementation approach – change and evaluate “in the field”
• Modeling results indicate downstream flooding issues
• Solicited direction from FERC – must conduct in-depth analysis of impacts and mitigation during relicensing process through modeling and studies prior to any operational changes
• Evaluation of permanent changes to winter pool will be conducted over the next 2 to 3 years and proposal included in license application in 2011
• Precedent has been set for addressing future drought conditions