Load Data for Vermont Docket 7081 workshop 9/30/05.
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Load Data for Vermont Docket 7081 workshop 9/30/05
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Transcript of Load Data for Vermont Docket 7081 workshop 9/30/05.
Load Data for Vermont
Docket 7081 workshop
9/30/05
9/30/05 Docket 7081 Workshop - D.LaForest
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Vermont Load Facts
• Vermont is a dual peaking region (summer and winter peak loads are approximately equal)
• Vermont has a “flatter” daily load profile and annual load cycle than is typical in New England (with a relatively flat profile from mid-morning into the evening)
• Vermont’s average load level is much higher than New England’s– For the period 9/1/04 to 8/31/05, Vermont’s average load was
67% of peak, while New England’s was 57% of peak
• Vermont has seen load growth in all seasons (spring, summer, fall and winter) which has made maintenance and construction difficult and costly
9/30/05 Docket 7081 Workshop - D.LaForest
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Consequences . . . • Vermont has been much more successful than most regions at using the full capacity
of its system (for more hours than typical)
• One chief consequence of this fact is that resources needed for system reliability (transmission system elements, generation, alternatives, etc.) are needed over extended portions of the day, and potentially for many consecutive days
• This means when a problem arises at peak load levels, the exposure quickly becomes large
• If the system cannot reliably take out single system elements for maintenance at intermediate load levels, then the ability to do maintenance is difficult at best (difficult to schedule with neighboring utilities / ISO-NE and local generation, is weather dependent, unplanned outages difficult are resolve and cancel planned work, limited work crews result in prioritizing work)
• Maintenance activities are being forced onto weekends, holidays, evening hours and spread out over multiple days
9/30/05 Docket 7081 Workshop - D.LaForest
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Vermont Load Data (based on 9/1/04 to 8/31/05 data)
VT load level # of hours % of total hours1050 23 0.3%1000 120 1.4%
950 496 5.7%900 1037 11.8%850 1906 21.8%800 3136 35.8%750 4616 52.7%700 5571 63.6%
VT load level # of days % of total days1050 7 1.9%1000 29 7.9%
950 73 20.0%900 131 35.9%850 199 54.5%800 273 74.8%750 336 92.1%700 353 96.7%
9/30/05 Docket 7081 Workshop - D.LaForest
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VT SUMMER LOAD PROFILE - 2005
600
650
700
750
800
850
900
950
1000
1050
11006/
6/20
05
6/13
/200
5
6/20
/200
5
6/27
/200
5
7/4/
2005
7/11
/200
5
7/18
/200
5
7/25
/200
5
8/1/
2005
8/8/
2005
8/15
/200
5
8/22
/200
5
8/29
/200
5
9/5/
2005
9/12
/200
5
9/19
/200
5
time
VT
Load
(MW
)
9/30/05 Docket 7081 Workshop - D.LaForest
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VT WINTER LOAD PROFILE - 2004/05
600
650
700
750
800
850
900
950
1000
1050
110010
/15/
2004
10/2
2/20
04
10/2
9/20
04
11/5
/200
4
11/1
2/20
04
11/1
9/20
04
11/2
6/20
04
12/3
/200
4
12/1
0/20
04
12/1
7/20
04
12/2
4/20
04
12/3
1/20
04
1/7/
2005
1/14
/200
5
1/21
/200
5
1/28
/200
5
2/4/
2005
2/11
/200
5
2/18
/200
5
2/25
/200
5
3/4/
2005
3/11
/200
5
3/18
/200
5
time
VT L
oad
(MW
)
9/30/05 Docket 7081 Workshop - D.LaForest
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9/30/05 Docket 7081 Workshop - D.LaForest
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