OCTOBER 22 2014
OCTOBER 22, 2014
Emera Maine’s Local System Plan – Bangor
Hydro District
Needs Assessment/Potential Solutions
Local Planning Advisory Committee Meeting
Emera M
E
Maine
i R
Representative:
t ti
Jeffrey Fenn, P.E., SGC Engineering LLC
Purpose of Local System Plan (LSP)
 Per Attachment K of the ISO-New England OATT – The
LSP iis an annuall reportt th
that:
t
 Describes non PTF transmission system reliability needs
 Reflects
 Local System planning studies
 Proposed solutions
 Identifies
 Local planning process
 Criteria, Data and Assumptions
2
LSP Communication
 LSP is communicated via Transmission Owners
Pl
Planning
i Ad
Advisory
i
C
Committee
itt (TOPAC) meeting
ti
following an ISO-New England PAC meeting
 The material is p
posted p
prior to the TOPAC meeting
g ((via
the ISO-New England PAC posting system)
 Transmission Customers and Stakeholders have 30
d
days
after
ft TOPAC presentation
t ti to
t provide
id written
itt
comments for consideration by Emera Maine
3
LSP Communication (continued)
 Emera Maine Contact:
 K
Kendra
d O
Overlock
l k
PO Box 932
970 Illinois Avenue
g , Maine,, 04402-0932
Bangor,
(207) 973-2895
[email protected]
 EM LSP is located at:
http://www.emeramaine.com/about-us/transmissiondevelopment/local-system-plan
development/local
system plan.aspx
aspx
4
Local System Planning Process
 The process is “Needs Assessment” followed by
Solutions Proposals
 Local System needs can result from:
 Load Growth
 Sub
Sub-area
area reliability assessments
 Point of delivery request from customers
 Generation interconnection requests (in accordance with
appropriate generator interconnection procedures)
 Local System Plan consists of:
 Summary of needs assessment results
 Listing of criteria, data and study assumptions
 Identification of proposed alternatives
 Solution study results and selection of preferred alternative
5
Criteria, Data, and Assumptions
 Loads are based on the New England specific area as
provided
id d iin th
the ISO
ISO-New
N
E
England
l d MOD case, EM
specific forecasts and local customer needs are used to
refine this
 Studies use relevant assumptions regarding
transmission, generation and demand resources found
in the latest ISO-New
ISO New England Regional System Plan
 Criteria follows ISO-New England as well as TPL
criteria or local planning criteria as appropriate – Local
criteria listed at the end of this presentation
6
LSP Project List
 The LSP project list is a cumulative listing of proposed
transmission solutions intended to meet local needs
 Similar to the ISO-New England PTF RSP, the LSP
contains the status of each project
 Concept
C
t – Project
P j t is
i under
d consideration
id ti as a solution
l ti tto a
partial needs assessment
 Proposed – Needs assessment completed and project proposed
as a solution,
l ti
b
butt nott fformally
ll b
budgeted
d t d
 Planned – Formally budgeted and if necessary, approved by
ISO-New England
 Under Construction – Significant engineering and internal
approvals in process and project is being implemented
 In-Service – Project used and useful
7
LSP - Needs
Need
Needs Assessment
Service Area
QP478
Interconnection study
Transmission
upgrades to support
proposed generation
Washington County
8
Potential Solutions
Under study
Year of Need
6/2015
LSP – Concept Status
Need
9
Needs
Assessment
Reliability
Line 74
Condition
Reliability
L50 condition
and support of
area load
growth
Reliabilityy
L70 condition
and Thermal
and Voltage
Project Name
Status
Solutions
Project InService
Month/Year
Bangor
Line 74
Study
L74
Rebuild/Recon
ductor
12/2016
Bangor
Corinth Village
support
Study
L50
Rebuild/Recon
ductor
12/2016
Studyy
L73
Rebuild/Recon
ductor
12/2016
Service Area
Bangor
g
Line 73
LSP – Proposed Status
Need
Needs
Assessment
Reliability
Eastern
E
t
Bangor
B
load
requirements
including hospital
10
Service Area
Bangor
Project Name
Waterworks
substation
Status
Proposed
Solutions
46kV liline
extension and
load serving
substation
Project InService
12/2016
LSP – Planned Status
Need
11
Needs
Assessment
Reliability
Line 13 Condition
Reliability
Line 5 Overload
Reliability
Improve area
reliability, support
MDI loads, defer
L32 loading issue
and improve
p
ability to maintain
transmission
circuits
Reliability
e ab y
Line 8 Condition
and
d lloading
di
Service Area
Project
Name
Status
Solutions
Project InService
Downeast
Line 13
Li
Rebuild E
Franklin east
Planned
Rebuild
12/2015
Bangor
T9L/501 line
Planned
Rebuild 0.25
mi
12/2014
Planned
Additional
34.5kV circuit
with diverse
route Part of
route.
area looping
12/2016
Planned
a ed
Line 8
reconductor
eco duc o
sections
Downeast
MDI reliability
Bangor
a go
Line 8
R
Reconductor
d t
06/2015
LSP – Under Construction Status
Need
Project In-Service
Service Area
Reliability
12/2014
Northern
Chester T3 Addition
Under Construction
Reliability
12/2014
Northern
Line 87 Rebuild
Under Construction
Reliability
12/2015
Bangor
Line 75
Rebuild/reconductor
Under Construction
12/2014
Downeast
L13 from E Franklin
west rebuild
Under Construction
Reliability
12
Project Name
Status
LSP – In-Service
Need
Project In-Service
Month/Year
Service Area
Nothing to report
13
Project Name
Status
Maine and Emera Maine – Bangor Hydro
j Transmission System
y
District - Major
14
Emera Maine Bangor Hydro District
Detailed System
15
Project Descriptions - Needs
 Queue 478 Interconnection – 10MW wind
i t
interconnection
ti to
t the
th EM subtransmission
bt
i i iin
Washington County
16
Project Descriptions - Needs
17
Project Descriptions - Concept
 Line 74 Rebuild/Reconductor– condition of existing
f iliti and
facilities
d th
thermall and
d voltage
lt
iissues on 46kV
system
 Line 50 Rebuild/Reconductor – Condition based need
for rebuild as well as thermal and voltage issues
 Line 73 Rebuild/Reconductor – Condition based need
f rebuild
for
b ild as wellll as th
thermall and
d voltage
lt
iissues
18
Project Descriptions - Concept
19
Project Descriptions – Proposed
 Waterworks Substation – new 46/12.5kV substation as
wellll as short
h t 46kV line
li extension
t
i tto serve th
the llocall
Eastern Bangor load as well as hospital expansion
20
Project Descriptions - Proposed
21
Waterworks Substation
22
Project Descriptions - Planned
 Line 13 Rebuild – E. Franklin east
 Line 5 – T9L/501 Rebuild 0.25 miles
 MDI Reliability – additional 34.5kV circuit with diverse
route.
route
 Line 8 Reconductor – segment and related switching
23
Project Descriptions - Planned
24
Line 13 Rebuild – E. Franklin east
25
Line 5 Rebuild – T9L/501
26
MDI Reliability
27
Line 8 Reconductor
28
Project Descriptions –
Under Construction




29
Chester T3
Line 87 Rebuild
Line 75 Rebuild/Reconductor
Line 13 from E.
E Franklin west Rebuild
Project Descriptions –
Under Construction
30
Chester T3
31
Line 87 Overload
32
Line 75
33
Line 13 E. Franklin west
34
Local System Planning Criteria
 The transmission system for purposes of this study is defined as those system
facilities that are operated at 34.5kV and above and are not considered to be under
ISO-NE planning (in general non PTF).
 The standard of service to be provided dictates the need for changes to the existing
system. It is necessary to consider the capability of transmission system elements,
possible equipment
p
q p
failures,, and the impact
p
of failures on the ability
y to serve area
loads.
 Transmission equipment is designed to operate within certain capabilities. The
power that may be transferred over transmission lines depends upon the current
carrying capacity of the wire and/or the required clearances of lines above ground
ground.
Transformers are limited by their heat dissipation capability. Circuit breakers or
switches are designed to sustain a certain continuous amount of current. Also, the
operation of customer electrical equipment requires that voltage be maintained
within a certain acceptable range
range. Transmission system facilities are capable of
regulating voltage within a limited range by varying reactive power and changing
transformer tap settings.
35
Local System Planning Criteria
 Since all equipment is subject to breakdown, it is necessary to consider the
consequence of such failures. One possible outcome could be the overload of other
equipment that remains in service. For example, if one of two parallel lines trips, the
remaining line may become overloaded. Overload beyond emergency ratings must
be avoided due to possible permanent damage to the equipment or for public safety.
Another consequence of equipment failure is the loss of power supply to customer
load. This could occur with the loss of a radial transmission line or as the result of
the cascaded outage of a looped transmission system. The loss of supply is critical
to loads such as industrial processing, home heating, and hospitals, and must be
considered in the design of the transmission system.
36
Local System Planning Criteria
CAPACITY CRITERION
 No facility is to be loaded in excess of its normal rating for any expected dispatch of
system generation at any load level. For any single contingency, no facility is to be
loaded in excess of its normal rating for the following load cycle or in excess of its
emergency rating immediately following the contingency,. Uneconomic generation
dispatch may be utilized to maintain power flows within ratings following a
contingency.
VOLTAGE CRITERION
 Transmission system voltages are to be maintained between 95% and 105% of
operating base voltage under normal system conditions and for
f any single
contingency. Further, voltages on the regulated side of load serving buses are to be
maintained between 100% and 105% of operating base voltage under normal
system conditions.
37
Local System Planning Criteria
LOSS OF LOAD CRITERION
 No loss of load in excess of 25 MW is to occur for any single contingency
contingency. Loss of
load less than 25 MW should be resupplied within 24 hours, except under very
adverse conditions.
MAINTENANCE CRITERION
 Transmission system planned maintenance is to be possible without exceeding
normal voltage and capacity limits and without loss of load.
38
Questions?
39