Millstone 345-kV DCT Split and SLOD SPS Removal

EVERSOURCE
LOCAL SYSTEM PLAN
2015
October 22, 2015
Update to Eversource LSP for 2014

The Eversource Local System Plan (LSP) has been
revised to incorporate the latest proposed changes
to the Eversource Local transmission system for
Connecticut, Massachusetts, and New Hampshire.

The LSP Project List is a cumulative listing of
proposed transmission solutions intended to meet
local needs.

This LSP-2015 supersedes Eversource’s LSP-2014.
1
Purpose of the Local System Plan
Per Attachment K – Local, the LSP:

Describes projected improvements to non-PTF (non-Pool
Transmission Facilities) that are needed to maintain system
reliability

Reflects:
– Local Needs Assessments
– Corresponding transmission system plans and future
studies
– Maps indicating project locations

Identifies:
– Local Planning Process
– Criteria, Data, and Assumptions used in the Local System
Planning Process
2
LSP Communication

ISO-NE posts the materials on the PAC web page prior to the
meeting.

PAC, Transmission Customers, and other Stakeholders have
30 days after the meeting to provide any written comments for
consideration by Eversource.
– Comments to be directed to:
Robert P. Clarke
Director, Transmission Business Operations
Eversource
One NSTAR Way, SE320
Westwood, MA 02090-9230
Phone: 781-441-8057
email: Robert.Clarke@eversource.com
3
LSP Communication (cont.)

Each PTO (Participating Transmission Owner) is individually
responsible for publicly posting and updating the status of its
respective LSP and transmission project list on their website in a
format similar to the ISO-NE Regional System Plan (RSP) Project
List .

Eversource’s project lists are located at:
– https://www.eversource.com/Content/ct-c/about/majorprojects-infrastructure/transmission-rates-tariffsinterconnections/ferc-order-890-posting-and-676-erequirements
4
Local System Planning Process

Local studies can result from:
– Load growth
– Area reliability assessments
– Point of Delivery Requests from customers
– Other efforts that may impact local facilities (e.g., elective
transmission upgrades, reliability transmission upgrades,
generator interconnections, short circuit or temporary
overvoltage studies)

The Local System Plan:
– Summarizes the needs
– Summarizes the selection of preferred solution
– Includes Local Projects that are related to projects listed in
the RSP
5
Criteria and Assumptions

All Eversource local transmission facilities (69 kV and above)
are part of the interconnected Eversource system and shall be
designed in accordance with criteria described in the
Eversource Transmission Reliability Guidelines.

Eversource complies with NERC, NPCC, and ISO-NE planning
criteria.

The annual ISO-NE CELT Report forecasts for the New
England area (90/10) load, with appropriate municipal
customer forecasts and/or sub-area forecasts, are used.

Studies use the ISO-NE provided base cases and the ISO-NE
short circuit database.
6
This Local System Plan includes the following types of
Transmission System connections
(illustrative examples)
PTF
Non-PTF
115 kV bus
Distribution
Connection to PTF
Distribution
115 kV
Non-PTF
Substation
Radial Connection
to PTF
 Eversource has distribution connections and radial transmission
connections.
7
NH, MA, and CT Projects in Regional System Plan
Large-scale reliability assessments may ultimately have Local
ramifications. Assessment studies are described in the ISO-NE
RSP. Several longer-term assessments have been completed,
and others are being conducted. Information about studies being
conducted that may affect the local system can be found in the
ISO-NE 2015 RSP*:
– New Hampshire, RSP section 6.3.2.2 and 6.3.2.4
– Connecticut, RSP section 6.4.2 and 6.4.2.3
– Eastern Massachusetts, RSP section 6.4.2.1 and 6.4.2.2
– Western Massachusetts, RSP section 6.4.2.1
* Public Meeting Draft 2015 Regional System Plan
posted on August 28, 2015.
8
LSP Project List

The LSP Project List is a cumulative listing of proposed transmission
solutions intended to meet LSP needs.

The LSP Project List includes the status of each Non-Pool Transmission
Facility (Non-PTF project). Non-PTF costs are provided for Proposed,
Planned, Under Construction, and In Service categories of projects, using
the same guidelines as the various stages of RSP projects. Some projects
may have Non-PTF costs yet to be determined.
–
–
–
–
–
Concept - Project is under consideration as a possible solution but the
needs assessment is not yet completed. Costs not known.
Proposed – Needs assessment completed and project proposed as the
solution, but Proposed Plan Application (PPA) not yet filed.
Planned - PPA has been filed and approved by ISO-NE.
Under Construction - Final engineering and internal approvals
completed and project being implemented.
In Service - Project completed.
9
Eversource Service Territories
Eversource operates in
three states:
Connecticut
Massachusetts
New Hampshire
10
Connecticut Projects
Bloomfield
Transformer
Canal
Transformer
& Breaker
Manchester
Transformer
Tracy
Transformer
& Breaker
Bulls Bridge
Transformer
Newtown
Substation
Greenwich
115/13.2
Substation
11
Local System Plan – Connecticut
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource CT Local Area Transmission Facilities Projects - Connecticut
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Project
Area
Reliability
2014 *
Northwest
Load Growth
May-15 *
Southwest
Reliability
Dec-15 *
Greater
Hartford
Load Growth
Load Growth
May-16
$2.4M
May-17
$2.0M
Load Growth
and Reliability
May-18
$107M
Load Growth
Dec-18 *
Southwest
Eastern
Norwalk/
Stamford
Status
Solutions
Bloomfield 3B - Replace Failed 3X Transformer
(Bloomfield)
In Service
Replace the 3X transformer which failed on 8/20/14 with a
new 115/23 kV, 60 MVA transformer (system spare)
Bulls Bridge substation – Add 27.6 kV Capacity
(New Milford)
In Service
Replace the existing 115/27.6 kV transformer with a new
dual-voltage transformer
Planned
Proactive replacement of aging 3A-2X with a new 115/23
kV, 60 MVA transformer
Project
Manchester 3A - replace aging 3A-2X
transformer (Manchester)
Canal substation - add 115/23 kV transformer
and add a 115 kV breaker (Southington)
Tracy substation - add 115/23 kV transformer
and add a 115 kV breaker (Putnam)
Greenwich 115/13.2 kV Substation Project
(Greenwich)
Southwest Newtown Substation (Newtown)
Planned
Planned
Planned
Planned
Add a second transformer of 47 MVA and a 115 kV
breaker
Add a third transformer of 47 MVA and two 115 kV circuit
breakers.
Add a new 115/13.2 kV bulk power substation in the
Greenwich area with three 60 MVA transformers and a sixbreaker ring bus. Also, two new 115 kV cable circuits
from Cos Cob to Greenwich.
Replace two existing transformers (28 & 30 MVA) with 60
MVA transformers.
* There are no Non-PTF costs for this project
12
Local System Plan – Connecticut (continued)
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource CT Local Area Transmission Facilities Projects - Connecticut
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Reliability
Dec-16
Greater
Hartford
Reliability
Dec-16
Southwest
Reliability
2017
Reliability
Project
Area
Project
Status
Solutions
Manchester 3A - replace aging 3A-3X
transformer (Manchester)
Concept
Proactive replacement of aging 3A-3X with a new 115/23
kV, 60 MVA transformer
Sasco Creek 51R - Metro North to replace
existing 51R-1X and 51R-2X transformers
Concept
Proactive replacement of aging 51R-1X and 51R-2X with
new 115/27.6 kV transformers.
Greater
Hartford
Bloomfield 3B - replace aging 3B-2X transformer
(Bloomfield)
Concept
Proactive replacement of aging 3B-3X with a new 115/23
kV, 60 MVA transformer
2018
Greater
Hartford
Westside 7A - replace aging 7A-3X transformer
(Middletown)
Concept
Proactive replacement of aging 7A-3X with a new 115/13.2
kV, 60 MVA transformer
Reliability
2018
Greater
Hartford
Newington 4A - replace aging 4A-1X and 4A-3X
transformers (Newington)
Concept
Proactive replacement of aging 4A-1X and 4A-3X with new
115/23 kV, 60 MVA transformers
Load Growth
2019
Greater
Hartford
Scitico Substation (Enfield)
Concept
Add a third transformer (60 MVA) to the substation.
Reliability
2019
Northwest
Franklin Dr 1B - replace aging 1B-4X and 1B-5X
transformers (Torrington)
Concept
Proactive replacement of aging 1B-4X and 1B-5X with new
115/13.2 kV, 60 MVA transformers
Reliability
2019
Northwest
Canton 5R - replace aging 5R-2X transformer
(Canton)
Concept
Proactive replacement of aging 5R-2X new 115/23 kV, 60
MVA transformers
13
Eastern Massachusetts Projects
Somerville
Transformer
Newton Highlands
Substation
and Reliability
Improvement
Sudbury
Reactors
Hopkinton
Transformer
Valley
Substation
BOSTON SUB
AREA
K-St to Dewar/
Andrew Sq
Barnstable –
Harwich Tap
Harwich Tap –
Harwich Bulk
Acushnet – Pine
Street
Mashpee
Substation
Hyannis Jct
Wing Lane
Substation
14
Local System Plan – Eastern Massachusetts
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - Eastern Massachusetts
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Load Growth/
Reliability
Dec-14
$2.7M
SEMA
Reliability
Dec -14
$5.1M
Load Growth
Project
Area
Project
Status
Solutions
Upgrade the capacity of the 119 line from
Harwich Tap to Harwich Bulk Substations
In Service
Upgrade ~4.5 miles of line to increase capacity.
NEMA
/Boston
Sudbury Reactors
In Service
Add 2 (20 Mvar) 115 kV reactors at Sudbury for light load
voltage control
Jun-15
$301K
NEMA
/Boston
Somerville Transformer 110A upgrade
In Service
Upgrade transformer 110A to a 65.4 MVA unit
Load Growth
Oct-15
$16.2M
SEMA
Hyannis Junction Substation Upgrade
Under
Triple-End Hyannis Junction with 3rd 115/23 kV 30/40/50
Construction MVA transformer bank and reconductor 115 kV line 123
Load Growth/
Reliability
Jun-16
$7M
SEMA
Wing Lane Substation Double Ending
Double-End Wing Lane Substation with 2nd 24/32/40
Under
MVA 115/13.2 kV bank. Reconfigure lateral #112 line to
Construction Arsene Street with a ABB Pass MO 2-breaker auto throw
over scheme.
Reliability
Dec-15
$15.9M
SEMA
Acushnet - Pine St Upgrades
Under
Add 115 kV breakers and reconfigure both Acushnet and
Construction Pine Street Substations.
Reliability
Jun-16
$3.6M
SEMA
Pine St. upgrade
Under
Add 2 (10 Mvar) Reactors at Pine St.
Construction
15
Local System Plan – Eastern Massachusetts
(continued)
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - Eastern Massachusetts
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Project
Area
Reliability
Dec-15
$19M
SEMA
Load Growth/
Reliability
Jun-16
$20.2M
NEMA
/Boston
Load
Growth/Reliability/
Generation
Interconnection
Dec-15 *June-17
Reliability
Project
Solutions
Status
New 115 kV Line from Barnstable to Harwich
Tap
Under
Build a new 7.8 mile 115 kV #139 line from Barnstable to
Construction Harwich Tap.
K-St to Dewar/ Andrew Sq Cable Project
Under
Install two 1-mile HPFF UG cables from K St to manhole
Construction on Day Blvd and split wye splices. Reconfigure K St bus.
SEMA
Valley Substation Upgrade (2 year project)
Upgrade Valley Substation to two (2) 115/23 kV 30/40/50
Under
MVA transformer banks. Replace #108 bank in 2015.
Construction Upgrade #113 side of station and replace #113 bank in
2017
Dec-15
$1.4M
NEMA/
Boston
Add a 115 kV capacitor bank at Newton
Highlands Substation
Proposed
Add 54 Mvar 115 kV capacitor bank at Newton Highlands
Substation
Reliability
May-16
$16M
NEMA/
Boston
Carver St. Station upgrade, Phase I
Proposed
Upgrade Carver St. Station. Install six 115 kV cirucit
breakers, upgrade protection and control, replace
transformers 110Aand 110B.
Load Growth
Jun-17
$1.73M
SEMA
Install 3rd Transformer at Hopkinton Station 126
Proposed
Add 115 kV breaker and 3rd Transformer
Load Growth
Reliability
Jun-19
$30M
NEMA/
Boston
New Substation proposed to improve Newton
Highlands Capacity
Proposed
Construct a new substation with two new 37/50/65.4 MVA
transformers, to be supplied by new transmission line
Reliability
Dec-20
$12.1M
NEMA/
Boston
Carver St. Station upgrade, Phase II
Proposed
Further develop Carver St. Station. Migrate to a 115 kV
breaker and a half arrangement.
* There are no Non-PTF costs for this project
16
Local System Plan – Eastern Massachusetts
(continued)
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - Eastern Massachusetts
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Project
Area
Load Growth
2016
SEMA
Tremont Substation - Transformer upgrade
Concept
Replace #114 12/16/20 MVA transformer with 15/20/25
[28] transformer using the spare removed from Valley
Substation
Reliability
2016
SEMA
230/115 kV Autotransformer at Medway
Substation
Concept
Add a 230/115 kV Autotransformer at Medway Substation
for use under extreme operating conditions
Load Growth
Reliability
2016
SEMA
2nd 115 kV Line from Duxbury to Marshfield
Concept
Install 2nd 115 kV transmission line from Duxbury
substation to Marshfield Substation
Load Growth
2016-2017
NEMA
/Boston
Sherborn - Transformer and Switchgear
upgrades
Concept
Upgrade both 40 MVA transformers to 65.4 MVA
transformers
Load Growth
2017
SEMA
Wellfleet - Transformer upgrades
Concept
Replace 16/21/26 MVA transformers with 30/40/50 MVA
transformers
Concept
Upgrade Falmouth Tap Switching Station from a 1-breaker
series bus arrangement to a 115 kV breaker and a half
scheme. Install a 115/23 kV bulk distribution station with
one 30/40/50 MVA transformer to address area load
growth
Concept
1) Install a 2nd 115 kV transmission line.
2) Construct additional distribution circuit backup.
3) Construct 2nd 115 kV line and new substation at
Bracket Road
Load Growth/
Reliability
Load Growth/
Reliability
2017
2019
SEMA
SEMA
Project
Falmouth Tap Switching Station Upgrade
115 kV line from Orleans to Wellfleet
Status
Solutions
17
Local System Plan – Eastern Massachusetts
(continued)
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - Eastern Massachusetts
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Project
Area
Load Growth/
Reliability
2017
SEMA
Fisher Road Supply Upgrade, 115 kV 4.4 miles
line from Cross Road to Fisher Road.
Concept
1) Install a 2nd 115 kV transmission line.
2) Construct additional distribution circuit backup.
Load Growth
2018
SEMA
Rochester Substation - Transformer upgrade
Concept
Replace #114 10/12.5 MVA transformer with 12/16/20
MVA transformer using spare transformer
Load Growth
2018-2019
SEMA
Industrial Park Substation - Upgrade
Transformers and Triple End Station
Concept
Upgrade both transformers to 62.5 MVA, triple end station
with 3rd 37/50/65.4 MVA bank
Load Growth
2019
NEMA
New Substation proposed to improve Amtrak
capacity
Concept
New GIS 4 breaker ring bus substation with two new
37/50/65.4 MVA transformers, to be supplied by new
transmission line
Concept
Install a 2 bay, 6 breaker arrangement, with a new control
house.
Need
Project
Status
Solutions
Reliability
2019
SEMA
Proposed solution to mitigate the loss of
Marshfield, Duxbury, and Kingston Substations
following a failure of the 19152 breaker at
Kingstion Station
Load Growth
2019-2020
SEMA
Double Ending Oak Street Substation
Concept
Double Ending Oak Street Substation with 2nd 30/40/50
MVA bank and 23 kV bus section
Load Growth
2020
NEMA
/Boston
Maynard - Concord Supply Upgrade
Concept
1) Install a third cable from Sudbury to Maynard.
2) Install oil return piping and cooling equipment for
increased capacity from the existing cables.
Load Growth
TBD
NEMA
Framingham - Install 3rd Transformer
Concept
Install a 3rd 65.4 MVA transformer
Load Growth
TBD
NEMA
Maynard - Transformer upgrades
Concept
Upgrade both transformers to 65.4 MVA
18
Western Massachusetts Projects
UMass/Amherst
Orchard
Transformer
Southwick
Transformer
West
Springfield GIS
19
Local System Plan – Western Massachusetts
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - Western Massachusetts
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Load Growth
and Reliability
May-15 *
Project
Area
Project
Springfield Southwick Substation transformer (Southwick)
Status
In service
UMASS-Amherst new substation (Tillson Farm)
Load Growth
and Reliability
Dec-15
$14.7M
Under
Construction
Hadley
Dec-17
$57.2M
Springfield
West Springfield 8C Substation transmission
asset replacement (West Springfield)
Load Growth
and Reliability
Apr-16 *
Springfield Orchard Substation 3rd transformer (Springfield)
Load Growth
and Reliability
2017
Hadley
Load Growth
and Reliability
2017
Greenfield
Load Growth
and Reliability
2017
Hadley
Replace the second transformer as part of the Southwick
23 kV conversion project.
UMASS-Amherst will be constructing/owning/operating a
new 115/13.8 kV substation with two 50 MVA transformer
transformers.
Install a circuit switcher and relaying at Amherst 17K to
accommodate Tillson Farm Substation
Amherst Substation (Amherst)
Reliability
Solutions
Under
Replace existing 115 kV substation with GIS
Construction
Planned
Install 3rd 115/13.8 kV 30 MVA transformer in existing
bay
Gunn Substation transformer upgrade
(Easthampton)
Concept
Replace existing 15A-2X 15/20/25 MVA transformer with a
28/37/47 MVA transformer
Montague Substation transformer upgrade
(Montague)
Concept
Replace existing 21C-4X 15/23 MVA transformer with a
28/37/47 MVA transformer
Gunn Substation transformer upgrade
(Easthampton)
Concept
Replace existing 15A-1X 15/20/25 MVA transformer with a
28/37/47 MVA transformer
* There are no Non-PTF costs for this project
20
Local System Plan – Western Massachusetts
(continued)
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - Western Massachusetts
Need
Projected ISD
Month/Year;
Non-PTF Est.
Cost
Project
Area
Load Growth
and Reliability
2018
Greenfield
Load Growth
and Reliability
2018
Pittsfield
Obsolescence
and Reliability
2018
Obsolescence
and Reliability
Project
Status
Solutions
Cumberland Substation transformer upgrade
(Greenfield)
Concept
Replace existing 22B-2X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
Doreen Substation transformer upgrade
(Pittsfield)
Concept
Replace exisitng 19A-1X 15/20/25 MVA transformer with a
28/37/47 MVA transformer
Springfield
Breckwood Substation transformer upgrade
(Springfield)
Concept
Replace existing 20A-2X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
2019
Springfield
Clinton Substation transformer upgrade
(Springfield)
Concept
Replace existing 21S-2X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
Obsolescence
and Reliability
2019
Springfield
Clinton Substation transformerupgrade
(Springfield)
Concept
Replace existing 21S-1X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
Obsolescence
and Reliability
2019
Springfield
Clinton Substation transformer upgrade
(Springfield)
Concept
Replace existing 21S-3X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
Obsolescence
and Reliability
2020
Springfield
Breckwood Substation transformer upgrade
(Springfield)
Concept
Replace existing 20A-1X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
Obsolescence
and Reliability
2020
Greenfield
Montague Substation transformer upgrade
(Montague)
Concept
Replace existing 21C-3X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
Obsolescence
and Reliability
2020
Springfield
Breckwood Substation transformer upgrade
(Springfield)
Concept
Replace existing 20A-3X 18/24/30 MVA transformer with a
28/37/47 MVA transformer
21
New Hampshire Projects
Rimmon
Substation
Mill Pond
Substation
North Keene
Substation
Peaslee
Substation
22
Local System Plan – New Hampshire
Status of project descriptors in blue have changed from previous LSP or are newly listed
Eversource Local Area Transmission Facilities Project Listing - New Hamsphire
Need
Load Growth /
Obsolete
Equipment
Projected ISD
Month/Year;
Non-PTF Est.
Cost
2017
Project
Area
division
Northern
Project
Webster Substation - replace all transformers
with two 115/34.5 kV, 44.8 MVA transformers
(Franklin)
Current
Status
Solutions
Concept
Replace the existing three 115/34.5 kV, 20 MVA
transformers at Webster substation with two 115/34.5 kV,
44.8 MVA transformers.
Concept
The new Unitil distribution substation (Broken Ground) will
be supplied by existing 115 kV Transmission lines (P145
and V182), Curtisville. The project will offload PSNH's
Garvins and Oak Hill substations.
Load Growth
2017
Central
Build a new Broken Ground/Curtisville
Substation (Concord)
Obsolete
Equipment
2017
Central
Retire existing 115/34.5 kV Greggs Substation
(Goffstown)
Concept
Remove the 115/34.5 kV transformer and associated 34.5
kV equipment at the existing Greggs substation. The 115
kV substation will remain.
Obsolete
Equipment
2018
Western
Keene Substation - Rebuild 115/12.47 kV
substation with 30 MVA transformer and
associated switchgear.
Concept
Rebuild Keene Substation equipment with one new 30
MVA transformer and associated switchgear. The
existing TB3 transformer (22.4 MVA) at Keene will remain.
Load Growth
2019
Northern
White Lake Substation - Replace one of the
existing 28 MVA transformer with a 44.8 MVA
transformer (Tamworth)
Concept
Replace one of the existing 115/34.5 kV, 28 MVA
transformer at White Lake substation with a new 115/34.5
kV, 44.8 MVA transformer.
23
Local Projects Included in the Regional System Plan
The projects listed below are associated with PTF projects listed in the ISO-NE RSP project
list. The RSP Project ID is shown in parentheses.
Eversource Local Area Transmission Facilities Project Listing - Projects in Regional System Plan
Need
Load Growth
Load Growth
Reliability
Projected ISD
Month/Year
Jun-15
$3.6M
Jun-16
$28.2M
Jun-16
$15.5M
Project
Area
Eastern
(NH)
Eastern
(NH)
Southern
(NH)
Project
Construct a new 115/12.5 kV
distribution substation (Mill Pond
Substation) in the Portsmouth area.
New 115 kV Switching Station, to be
called Peaslee. From Peaslee
construct new 115 kV lines.
New substation to replace the existing
distribution Rimmon substation
Status
Needs Assessment
Solutions
Potential overloads in the Portsmouth area
of New Hampshire and provide operational
flexibility to the distribution system
The new Distribution substation transformer will
be supplied by tapping existing Transmission
lines. Distribution infrastructure upgrades will
serve local load growth and provide reliability of
service.This project is associated with a PTF
project listed in the ISO-NE RSP project list.
(1557)
Under
Construction
Needed for Unitil 34.5 kV system load
growth and PSNH design criteria.
Construct a new 115 kV Switching Station.
Construct a new 5.5-mile 115 kV line from
existing Kingston Tap to the new switching
station. Construct two lines to Unitil 115/34.5 kV
Substation (two 60 MVA transformers). This
project is associated with a PTF project listed in
the ISO-NE RSP project list. (1183).
Under
Construction
115/34.5 kV transformation is needed in the
Manchester, New Hampshire area to
address thermal loading violations on the
existing Rimmon Substation 115/34.5 kV
transformer .
Rebuild Rimmon substation and add three 115 kV
breakers, install a 2nd 115/34.5 kV transformer
and two 115 kV 13.3 Mvar capacitors, connect
the Rimmon substation to the J114 line. This
project is now a PTF project listed in the ISO-NE
RSP project list. (1661)
In Service
Reliability
Jun-16
$10M
Western
(NH)
New 115 kV Substation, to be called
North Keene.
Planned
Load Growth
Reliability
Jun-16
$7.9M
SEMA
Mashpee Substation Double Ending
Planned
Construct a new substation, loop in the L163 line
with two 115 kV breakers, install one 115/12.47
kV 30 MVA transformer. This project is now a
PTF project listed in the ISO-NE RSP project list.
(1660)
Double-End Mashpee Substation with 2nd
Contingency outage of the #115 Falmouth to
30/40/50 MVA 115/23 kV transformer bank. Install
Barnstable line interrupts 133.9 MW of
two 115 kV sectionalizing breakers. This project
forecasted peak load and 35 Mvar of reactive
is associated with a PTF project listed in the ISOsupport
NE RSP project list. (1393).
Needed to relieve potential distribution
overloads and short circuit issues in the
Keene area of New Hampshire.
24
Future Studies: Connecticut

Load growth may require a third transformer (60 MVA) at the
North Bloomfield Substation

Load growth may require a second transformer at the Carmel
Hill Substation

Load growth may require increased transformer capacity at the
West Brookfield Substation

Load growth may require replacing two 25 MVA 115/13.2 kV
transformers with 47 MVA transformers at Uncasville
substation

Load growth may require a new 115/23 kV bulk power
substation in the Torrington area (Burrville Substation)
25
Future Studies: Massachusetts

Load growth and reliability needs may require voltage
conversion of Midway 19B from 13.8 kV delta to 13.8 kV
grounded wye, or 23 kV grounded wye

Load growth and reliability needs may require Transmission to
be extended into Hannon (a new substation) in the City of
Springfield

Load growth and reliability needs may require adding a 13.8
kV transformer for distribution at South Agawam 42E

Carver St. Station upgrade, Phase II (third transformer)
26
Future Studies: New Hampshire

Load growth may require a second transformer at Portsmouth
Substation

Load growth may require replacing the Pemigewasset
transformer with a larger transformer

Load growth may require a new substation in the
Dover/Madbury area

Customer reliability need may require a new substation in the
Littleton area
27
Please provide any written comments for consideration by
November 23, 2015 (as defined in the ISO-NE Open
Access Transmission Tariff Section II – Attachment K
Appendix 1 [Attachment K – Local], section 1.4).
Robert P. Clarke
Director, Transmission Business Operations
Eversource
One NSTAR Way, SE320
Westwood, MA 02090-9230
Phone: 781-441-8057
email: Robert.Clarke@eversource.com
28
Thank you for participating in the
Eversource LSP Presentation.
Questions?
29