OCTOBER 22 2014
Emera Maine’s Local System PlanNeeds Assessment/Potential Solutions
OCTOBER 22, 2014
Needs Assessment/Potential SolutionsLocal Planning Advisory Committee Meeting
Emera Maine Representative:pJeffrey Fenn, P.E., SGC Engineering LLC
Purpose of Local System Plan (LSP)
Per Attachment K – The LSP is an annual report that:D ib PTF t i i t li bilit d 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 i Ad i C itt (TOPAC) tiPlanning Advisory Committee (TOPAC) meeting following an ISO-New England PAC meeting
The material is posted prior to the TOPAC meeting (via p p g (the ISO-New England PAC posting system)
Transmission Customers and Stakeholders have 30 d ft TOPAC t ti t id ittdays after TOPAC presentation to provide written comments for consideration by Emera Maine
3
LSP Communication (continued)
Emera Maine Contact:K d O l k Kendra OverlockPO Box 932970 Illinois AvenueBangor, Maine, 04402-0932g , ,(207) [email protected]
EM LSP is located at: http://www.emeramaine.com/about-us/transmission-development/local-system-plan aspxdevelopment/local system plan.aspx
4
Local System Planning Process The process is “Needs Assessment” followed by
Solutions Proposals Local System needs can result from: Load Growth Sub-area reliability assessmentsSub area reliability assessments Point of delivery request from customers Generation interconnection requests (in accordance with
appropriate generator interconnection procedures)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
Solution study results and selection of preferred alternative
Criteria, Data, and Assumptions
Loads are based on the New England specific area as id d i th ISO N E l d MOD EMprovided in the ISO-New England 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 England Regional System Planin the latest 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 projectC t P j t i d id ti l ti t Concept – Project is under consideration as a solution to a partial needs assessment Proposed – Needs assessment completed and project proposed
l ti b t t f ll b d t das a solution, but not formally budgeted 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 Potential Solutions Year of Need
QP478 Interconnection study
Transmission upgrades to support proposed generation
Washington County Under study 6/2015
8
LSP – Concept Status
Need Needs Assessment Service Area Project Name Status Solutions
Project In-Service
Month/YearMonth/Year
Reliability Line 74 Condition Bangor Line 74 Study
L74 Rebuild/Reconductor
12/2016
L50 condition L50Reliability and support of
area load growth
Bangor Corinth Village support Study
L50 Rebuild/Reconductor
12/2016
ReliabilityL70 condition and Thermal Bangor Line 73 Study
L73 Rebuild/Recon 12/2016y
and Voltageg y
ductor
9
LSP – Proposed Status
Need Needs Assessment Service Area Project Name Status Solutions Project In-
Service
E t B 46kV li
Reliability
Eastern Bangor load requirements including hospital
Bangor Waterworks substation Proposed
46kV line extension and load serving substation
12/2016
10
LSP – Planned Status
Need Needs Assessment Service Area Project
Name Status Solutions Project In-Service
Li 13Reliability Line 13 Condition Downeast
Line 13 Rebuild E Franklin east
Planned Rebuild 12/2015
Reliability Line 5 Overload Bangor T9L/501 line Planned Rebuild 0.25 mi 12/2014
Reliability
Improve area reliability, support MDI loads, defer L32 loading issue and improve Downeast MDI reliability Planned
Additional 34.5kV circuit with diverse route Part of
12/2016pability to maintain transmission circuits
route. Part of area looping
Reliability Line 8 Condition d l di Bangor Line 8
R d t PlannedLine 8 reconductor 06/2015e ab y and loading a go Reconductor a ed eco duc osections
11
LSP – Under Construction Status
Need Project In-Service Service Area Project Name Status
Reliability 12/2014 Northern Chester T3 Addition Under ConstructionReliability 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
Reliability 12/2014 Downeast L13 from E Franklin west rebuild Under Construction
12
LSP – In-Service
Need Project In-Service Month/Year Service Area Project Name Status
Nothing to report
13
Maine and Emera Maine Major Transmission SystemMajor Transmission System
14
Emera Maine Detailed System
15
Project Descriptions - Needs
Queue 478 Interconnection – 10MW wind i t ti t th EM bt i i iinterconnection to the EM subtransmission in Washington County
16
Project Descriptions - Needs
17
Project Descriptions - Concept
Line 74 Rebuild/Reconductor– condition of existing f iliti d th l d lt i 46kVfacilities and thermal and voltage issues 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 b ild ll th l d lt ifor rebuild as well as thermal and voltage issues
18
Project Descriptions - Concept
19
Project Descriptions – Proposed
Waterworks Substation – new 46/12.5kV substation as ll h t 46kV li t i t th l lwell as short 46kV line extension to serve the local
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
routeroute. 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 ConstructionUnder Construction
Chester T3 Line 87 Rebuild Line 75 Rebuild/Reconductor Line 13 from E Franklin west Rebuild Line 13 from E. Franklin west Rebuild
29
Project Descriptions –Under ConstructionUnder 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 failures, and the impact of failures on the ability to serve area p q p , p yloads.
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 groundcarrying capacity of the wire and/or the required clearances of lines above 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 Transmission system facilities are capable ofwithin a certain acceptable 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 ofNo 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 adispatch 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
foperating base voltage under normal system conditions and for 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 Loss ofNo loss of load in excess of 25 MW is to occur for any single 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