Reliability Issues and Solutions 4

3.2 Proposed Transmission Solutions, continued

Figure 3‑5. Proposed transmission project details (the cost estimates are in year 2008 millions of dollars).

Note: the following table has been split into two parts for web viewing.

Priority number	Name	Year of Need	Load MW Needed	Low Cost	High Cost	Project Type	Defi-ciencies
1	St. Johnsbury	2009	400	$ 22	$ 22	Substation	10
2	Middlebury	2009	700	$ 10	$ 20	Substation	2
3A	St Albans	2009	900	$ 25	$ 50	Substation	1
3B	Georgia	2009	1100	$ 20	$ 40	Substation	1
3C	Georgia-St. Albans	2018	1275	$ 15	$ 30	Transmission	1
4	S Rutland	2009	1000	$ 15	$ 30	Substation	5
5	Blissville	2009	800	$ 15	$ 30	Substation	3
6	Hartford	2009	1000	$ 15	$ 30	Substation	4
7	Ascutney	2009	<1170	$ 14	$ 28	Substation	6
8A	Newport	2009	1000	$ 1	$ 2	Substation	10
8B	Queen City	2009	<1170	$ 2	$ 4	Substation	8
8C	W Rutland	2009	<1170	$ 6	$ 12	Substation	8, 9
8D	Ascutney	2009	<1170	$ 2	$ 4	Substation	6
8E	Coolidge Reactor	2011	1200	$ 4	$ 8	Substation	9
9	Coolidge-Ascutney	2009	N/A	$ 25	$ 50	Transmission	12
10	Yankee to Vernon Rd	2009	<1170	$ 5	$ 10	Transmission	11
11	Vernon	2010	1185	$ 15	$ 30	Substation	14
12	Ascutney-Ascutney Tap	2013	1210	$ 5	$ 10	Transmission	13
13	Coolidge-Cold River	2013	1210	$ 35	$ 70	Transmission	15
14	Bennington	2009	<1170	$ 10	$ 20	Substation	7
15	Ascutney Transformer	2013	1210	$ 6	$ 12	Substation	6
16	Coolidge Transformer	2016	1245	$ 20	$ 40	Substation	16
17	Barre	2018	1275	$ 10	$ 20	Substation	19
18	Chelsea	2018	1275	$ 15	$ 30	Substation	4
19	Plattsburgh-Essex	2021	N/A	$ 200	$ 300	Transmission	21, 22, 23
	TOTAL			$ 512	$ 902

Priority number

Name

Project

Affected DUs

Lead DU

1

St. Johnsbury

Construct new ring substation at or near Lyndonville substation, install capacitor banks

CVPS, LED for station. CVPS, LED & VEC for capacitor banks

LED

2

Middlebury

Install 2nd 115/46 kV transformer, rebuild to ring station

CVPS

CVPS

3A

St Albans

Construct new ring station with two 115/34.5 kV transformers

CVPS, VEC

CVPS

3B

Georgia

Rebuild to ring station

All Vermont Dus

CVPS

3C

Georgia-St. Albans

Construct new Georgia to St Albans 115 kV transmission line, under 10 miles. Needed before 2018.

All Vermont Dus

VEC

4

S Rutland

Construct new substation with a 115/46 kV transformer

CVPS

CVPS

5

Blissville

Install 2nd 115/46 kV transformer, rebuild to ring station, install capacitor banks

CVPS

CVPS

6

Hartford

Install 2nd 115/46 kV transformer, rebuild to ring station

CVPS, GMP

CVPS

7

Ascutney

Rebuild to breaker-and-a-half station

All Vermont DUs, NU, NGRID

CVPS

8A

Newport

Install capacitor banks

All Vermont DUs

VEC

8B

Queen City

Install capacitor bank

All Vermont DUs and NGRID

GMP

8C

W Rutland

Install capacitor banks and shunt reactors

All Vermont DUs and NGRID

CVPS

8D

Ascutney

Add capacitor banks

All Vermont DUs, NU, NGRID

CVPS

8E

Coolidge Reactor

Install shunt reactor

All Vermont DUs, NU, NGRID, NY

CVPS

9

Coolidge-Ascutney

Rebuild transmission line to higher rating, under 15 miles

All Vermont DUs, NU, NGRID

GMP

10

Yankee to Vernon Rd

Rebuild line for higher rating, under 10 miles

All Vermont DUs, NU, NGRID

CVPS

11

Vernon

Install 2nd 345/115 kV transformer

All Vermont DUs, NU, NGRID

CVPS

12

Ascutney-Ascutney Tap

Rebuild transmission line to higher rating, under 10 miles

All Vermont DUs, NU, NGRID

CVPS

13

Coolidge-Cold River

Rebuild transmission line to higher rating, under 20 miles

All Vermont DUs, NY

CVPS

14

Bennington

Rebuild to ring substation, install capacitor banks

All Vermont DUs, NGRID

CVPS

15

Ascutney Transformer

Install 2nd 115/46kV transformer

CVPS, Ludlow for station

CVPS

16

Coolidge Transformer

Install 2nd 345/115 kV transformer

All Vermont DUs, NU, NGRID, NY

CVPS

17

Barre

Install 2nd 115/34.5 kV transformer and rebuild to ring station. 2018 assumes there will be an upgrade to the 34.5 kV system

GMP, WEC

GMP

18

Chelsea

Install 2nd 115/46 kV transformer, rebuild to ring station

CVPS, WEC

CVPS

19

Plattsburgh-Essex

Construct new Plattsburgh to Essex 230 kV transmission line, parallel with existing 115 kV lines, under 30 miles, NOTE: timing may be 2016 or earlier depending on other possible scenarios

All Vermont DUs

GMP

TOTAL

* R&J = Readsboro and Jacksonville

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