2012 EC6A –
Garrison Pumped Storage Update
WIST Meeting
September 10, 2009
2012 Scenarios
● 2012 PC6 – Median Hydro w PLF
● 2012 PC7 – High Hydro Sensitivity
● 2012 PC8 – Low Hydro Sensitivity
● 2012 PC6-1, 2012 PC7-1, 2012 PC8-1 –
High Gas Sensitivities on the Median, High
and Low Hydro Scenarios
● 2012 EC6A – Median Hydro w 400 MW
Pumped Storage added at Garrison
2
Scenario Results – 2012 EC6A
Pumped Storage Scenario
2012 EC6A Pumped Storage at Garrison
● Created by adding 400 MW of pumped
storage at Garrison (bus 40459) to the
2012 PC6 Median Hydro scenario (2012
base case)
● Pumped storage model inputs:
 400 MW generating capacity
 300 MW refill capacity
 70% cycle efficiency
 Pumping/generating decision based on the
4
bus LMP
Wind Modeling in Promod
● Currently, wind is a fixed resource in
5
Promod
● Hourly generation profiles have been
defined for all wind units in our dataset
● Promod uses these profiles to modify the
load shapes prior to the dispatch of the
thermal resources
● Result: No changes were observed in the
wind generation in the 2012 EC6A
scenario
Results from 2012 EC6A - Overall
Comparison of Energy Results by Category
Generation Results (MWh)
2012 EC6A
Garrison Pumped
2012 PC6 Median Storage w Same
Category
Hydro_072709
FO Schedule
Difference
Diff %
Conventional Hydro
245,864,271
245,864,271
0
0.000%
Pumped Storage
2,125,848
2,152,033
26,185
1.232%
0.025%- Coal
Steam
286,400,588
286,472,439
71,851
0.025%
Steam - Other Garrison contributed an8,189,051
8,177,894
(11,157)
-0.136%
additional 81,000 MWh of generation, but the net
Nuclear
76,422,232
261 means
0.000%
change in total Pumped
Storage is only 76,422,493
about 26,000 MWh. This
Combined Cyclethere was a decrease
270,572,894
270,530,581
(42,313)
-0.016%
in existing pumped storage in this scenario.
Combustion Turbine
9,051,010
9,054,773
3,763
0.042%
Cogeneration
16,191,794
16,187,329
(4,465)
-0.028%
IC
347,338
347,466
129
0.037%
1.232%
Synthetic Crude Tar Sands
0
0
0
0.000%
Negative Bus Load
4,823,092
4,823,092
0
0.000%
Biomass RPS
7,324,747
7,329,240
4,493
0.061%
0.061%
0.042%
0.037%
Geothermal
19,531,029 0.000% 19,531,029
0
0.000%
-0.028%
-0.136%
Small Hydro RPS
3,034,094
3,034,094
0
0.000%
Solar
7,465,216
7,465,216
0
0.000%
Wind
35,929,117
35,929,117
0
0.000%
Net Changes in Annual WECC Generation by Type
80,000
60,000
40,000
20,000
0 MWh
0
(20,000)
Total
993,272,322
993,321,068
48,746
0.005%
73,284,204
7.4%
73,288,696
7.4%
4,493
0
0.006%
0.001%
158
10,366
399
59
0
0
59.741%
0.000%
0.009%
(40,000)
Renewable Total
Renewable Percent
(60,000)
Other Results (see TEPPC Glossary for definitions)
Dump Energy
99
Emergency Energy
10,366
CO2 Emissions (MMetricTons)
399
CO2 Adder ($/metric ton)
0.000
0.000
CO2 Adder (Total M$)
Other Variable Costs (M$)
0
23,875
0
23,871
0
(4)
0.000%
-0.015%
Total Var. Prod. Cost (M$)
23,875
23,871
(4)
-0.015%
Variable Production Cost (thermal units)
6
-0.016%
Results from 2012 EC6A - Overall
Net Changes in Overall Annual Generation By Region
150,000
0.06%
100,000
0.005%
50,000
0.03%
0.01%
0 MWh
0
NWPP
BASIN
AZNMNV
0.004%
CANADA
RMPP
California
WECC
-0.03%
(50,000)
(100,000)
-0.04%
(150,000)
The net increase in WECC generation is due to Garrison’s pumping.
7
Results from 2012 EC6A - Overall
Chart Title by Region and Type
Changes in Annual Generation
CANADA
NWPP
BASIN
RMPP
California
AZNMNV
100,000
Garrison Pumped Storage
80,000
60,000
40,000
20,000
0 MWh
0
Pumped Storage
Steam - Coal
Steam - Other
(20,000)
Nuclear
Combined Cycle
Combustion
Turbine
Cogeneration
IC
(40,000)
(60,000)
CA and Rockies Pumped Storage
(80,000)
Generation that did not change: Conventional Hydro, Geothermal,
Small Hydro RPS, Solar, Wind
8
Biomass RPS
Results from 2012 EC6A –
Garrison Pumped Storage
Pumping/Generating Energy Summed
OverTitle
the Course of the Year – By Hour of Day
Chart
Pumping
Generating
20000
15000
10000
5000
0 MWh
0
1
-5000
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Hour of Day
-10000
-15000
-20000
Garrison pumped 670 hrs during the year
Garrison generated 371 hrs during the year, 69 hours at max capacity (400 MW)
9
Results from 2012 EC6A –
Montana Generation
Changes in MT Generation in Response to Garrison Pumped Storage
Gen Name
Diff in Gen (MWh) % Diff
GARRISON
80,936
Colstrip2
201 0.008%
Corette1
81 0.008%
Hardin Generation
15 0.002%
MillCreek_GS2
(223) -2.336%
MillCreek_GS1
(401) -4.017%
MillCreek_GS3
(482) -5.101%
MONTANA1_1
(484) -0.159%
Colstrip3
(2,211) -0.039%
Total MT Gen Change*
(3,503)
*Change does not include Garrison energy.
Gen Type
Gen Location
Large Coal
Large Coal
Large Coal
CT
CT
CT
Small Coal
Large Coal
near Billings
near Colstrip
South of Garrison
South of Garrison
South of Garrison
near Colstrip
Questions:
• What is being used to charge the pumped storage?
• What generation is Garrison displacing?
10
Results from 2012 EC6A –
Montana Generation
Net Changes in Colstrip 2 Generation by Hour
Over the Course of the Year
400
200
Net Changes in Existing MT Generation by Hour
Over the Course of the Year
0 MWh
0
-200
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour of Day
-400
400
-600
200
-800
0 MWh
0
-1000
-200
-400
Net Changes in Colstrip Generation by Hour
Over the Course of the Year
-800
400
-1000
200
0 MWh
0
-200
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour of Day
-400
-600
-800
-1000
11
-600
Note: Colstrip 2&3 are both coal plants in MT
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
If MT generation is
decreasing during the hours
Garrison is pumping, what
generation is being used to
pump?
Note: These changes reflect changes to existing generation in
response to the new Garrison pumped storage plant.
Notes on the Promod Dispatch of
Thermal Resources
● Loads are defined at the area level, and are
distributed to buses within an area at the
beginning of a simulation.
● After this is complete, Promod dispatches pool
resources to meet the pool load and reliability
requirements. Each pool consists of multiple
areas. Pool = Region in our reporting.
● During this dispatch, Promod looks for economic
opportunities for exchange of power among
pools.
● Overall goal is to minimize total system cost.
12
Results from 2012 EC6A – Off-Peak
Difference in Off-Peak Generation
Cogeneration
Biomass RPS
Combined Cycle
Combustion Turbine
IC
Nuclear
Steam - Coal
Steam - Other
Total
40000
30000
20000
10000
0
AZ-NM-NV
Basin
Canada
CA-North
CA-South
NWPP
RMPA
-10000
-20000
-30000
-40000
-50000
During the off-peak hours (when Garrison is pumping) we see increased transfers from the Basin to the
NW, decreased transfers from the NW to CA, and increased transfers from AZ-NM-NV to CA to make up
for the generation CA has lost from the NW.
13
Results from 2012 EC6A – On-Peak
Difference in On-Peak Generation
Cogeneration
Biomass RPS
Combined Cycle
Combustion Turbine
IC
Nuclear
Steam - Coal
Steam - Other
Total
40000
30000
20000
10000
0
AZ-NM-NV
Basin
Canada
CA-North
CA-South
NWPP
RMPA
-10000
-20000
-30000
-40000
-50000
During the on-peak hours (when Garrison is generating) we see increased transfers from the NW to the
Basin and CA, and decreased transfers from AZ-NM-NV into CA.
14
Changes in Path Flows –
Montana to NW
MT-NW Annual Duration Plot
PC6
EC6A Pumped Storage
2500
PC6 Base
Case
EC6A Pumped
Storage
2000
% time @ 75% Limit
37.08%
36.62%
1500
% time @ 90% Limit
18.14%
17.96%
% time @ 99% Limit
8.11%
8.25%
1000
500
-500
1
383
765
1147
1529
1911
2293
2675
3057
3439
3821
4203
4585
4967
5349
5731
6113
6495
6877
7259
7641
8023
8405
0 MW
0
-1000
Change in Average MW Flow - Montana - Northwest
0 aMW
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Note: Flows on the MT to NW
path are measured (in Promod)
east of where the Garrison
pumped storage is located.
-5
-10
-15
-20
15
-25
Hour of Day
Changes to Path Flows –
Montana to NW
Number of Hours During the Year at or Above 99% Limit - Montana to NW
PC6
EC6A
140
120
100
80
60
40
20
0
1
16
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Changes in Line Flows –
Garrison to Taft
Change in Average MW Flow - Garrison to Taft
15
10
5
0 aMW
0
-5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour of Day
-10
-15
-20
-25
This line is west of the garrison pumped storage plant. Decreased flows during
the night are due to the pumping at Garrison. Some of the generation used for
pumping is coming from Washington, which contributes to a decrease in east to
west flows in this line.
17
Changes in Path Flows –
West of Broadview
Change in Average MW Flow - West of Broadview
1
0 aMW
0
-1
-2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
PC6 Base
Case
EC6A Pumped
Storage
5.66%
5.79%
Hour of Day
% time @ 99%
Limit
-3
-4
-5
-6
-7
Number of Hours During the Year at or Above 99% Limit - West of Broadview
-8
PC6
-9
EC6A
60
50
40
30
20
10
18
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Changes in Path Flows – COI
Change in Average MW Flow - COI
5
0 aMW
0
-5
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 @ 99%
Limit
Hour of Day
-10
PC6 Base
Case
EC6A Pumped
Storage
19.91%
19.82%
-15
-20
Number of Hours During the Year at or Above 99% Limit - COI
-25
-30
PC6
EC6A
140
-35
120
100
80
60
40
20
19
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Questions/Comments?
20