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Welcome to Sabine River Authorityof  Louisiana

Engineering - Operation Guide

OPERATING GUIDE RULE CURVE
HYDROELECTRIC POWER PLANT, TOLEDO BEND DAM
EFFECTIVE MAY 25, 2007

MONTHReservoir Stage - Ft. MSLPLANT OPERATION
October thru DecemberBelow 168
Above 168
No power generated.
Operate plant up to full capacity. *
JanuaryBelow 168.5
Above 168.5
No power generated.
Operate plant up to full capacity. *
FebruaryBelow 169
Above 169
No power generated.
Operate plant up to full capacity. *
MarchBelow 169.5
Above 169.5
No power generated.
Operate plant up to full capacity. *
April 1-15Below 170
Above 170
No power generated.
Operate plant up to full capacity. *
April 15-30Below 171
Above 171
No power generated.
Operate plant up to full capacity. *
May Any stage Above 168 ** Above 172Use Volume necessary to meet Prime Power Schedule (see Note 2.)
Operate plant up to full capacity. *
JuneAny stage Above 168 ** Above 172Use Volume necessary to meet Prime Power Schedule (see Note 2.)
Operate plant up to full capacity. *
JulyAny stage Above 168 ** Above 172Use Volume necessary to meet Prime Power Schedule (see Note 2.)
Operate plant up to full capacity. *
AugustAny stage Above 168 ** Above 172Use Volume necessary to meet Prime Power Schedule (see Note 2.)
Operate plant up to full capacity. *
SeptemberAny stage Above 168 **Use Volume necessary to meet Prime Power Schedule (see Note 2.)

Notes:
1. Maximum turbine discharge, capacity 30 M Ac. Ft. per day.
2. In accordance with Section 5.05 of the Consolidated Power Sales Agreement, no more than 30,000,000 kwh’s of prime power shall be scheduled during any one month of the Peaking Period, except with prior written consent of the Authorities.
3. Releases for downstream flows shall be in accordance with Section 5.10 of the Consolidated Power Sales Agreement.
4. When pool stage is at or above 172.5 and inflow is greater than power plant capacity, operate spillway in accordance with “Guide on Spillway Gate Operation.”
5. Authorities will notify companies as to flow conditions in the Sabine River as required in Section 5.07 of the Consolidated Power Sales Agreement.
6. Control stages set forth above are to be maintained only to the extent possible when making releases through the power plant. Spillway gates are to be opened only when stages specified in the “Guide on Spillway Gate Operation” are reached.
7. During prime power season when stage of lake is near upper limit maintain close watch on inflow and make releases for secondary power generation to avoid spillway releases if possible.

* Releases to be determined based on best judgment considering upstream conditions, stages at Ruliff and inflows below dam.
** No generation below the 168’ msl except in the event of any of the following:
(1) the FERC, or successor agency orders or requires a reduction in the water level of the Reservoir for purposes of inspecting or repairing the dam,
(2) an insufficient supply of electric power to the Companies’ firm or non-interruptible power users will result,
(3) non-use of the waters of the Reservoir for the generation of hydroelectric power will result in the failure to satisfy minimum downstream flow requirements necessary to meet water sales from the diversion canals of the Authorities,
(4) non-use of the waters of the Reservoir for the generation of hydroelectric power will result in the failure to deter saltwater encroachment into Sabine River Estuaries, or
(5) the Authorities fail to make all credits owed to the Companies or fail to make full reimbursements as required in Section 3.02A and 3.07 of the Consolidated Power Sales Agreement within the time identified in the Amendment.