1 1 1 Central Maine Power Company Local System Plan Presentation Planning Advisory Committee Meeting November 17, 2011

2 2 2 Purpose of Local System Plan Per Attachment K – Local, this LSP presentation: Describes projected improvements to non-PTF that are needed to maintain reliable customer service. Reflects: –LSP Needs Assessments –Corresponding transmission system planning studies

3 3 3 LSP Communication LSP is communicated to the PAC at an ISO-NE PAC RSP meeting once a year. –Separate meetings can be arranged if needed PAC, Transmission Customers, and other Stakeholders have 30 days to provide written comments for consideration to CMP –CMP’s contact: Curtis Beveridge Manager System Planning Central Maine Power Company 83 Edison Drive Augusta, Maine (

4 4 4 LSP Communication cont. Each PTO is individually responsible for publicly posting and updating the status of its respective LSP and the transmission projects list on a website in a format similar to the RSP project list The ISO-NE RSP project list contains links to each individual PTO’s transmission project list CMP’s LSP project list is located at: Services/CMPTransmissionSvc/lsp.html

5 5 5 CMP LSP Project List Central Maine Power will update the LSP project list at least annually. A presentation of the LSP will be made annually. LSP Project List is a cumulative listing of proposed transmission solutions intended to meet identified needs. Similar to PTF projects in the RSP, the LSP project list contains a status of each non-PTF project: Concept-Project is under consideration as a possible solution to a need, but little or no analysis is available Proposed-CMP has determined that the project is an appropriate solution to a need, but has not yet obtained internal budget approval Planned-Budgetary approval has been obtained Under Construction- Project is approved and is under design/construction In-Service-Project is complete

6 6 6 CMP’s Local System Planning Process All CMP system upgrades are determined in accordance with Iberdrola USA Electric System Planning Manual. Planning studies can result from: –Periodic Assessment of CMP’s 14 Local Planning AreasCMP’s 14 Local Planning Areas –Load Growth –Retail or Wholesale Customer Request –Generator Interconnection Request –System-Wide Contingency Analysis Studies may utilize both ISO-NE Library Base Cases and/or Local CMP Base Cases. Generator Interconnections on the non-PTF Transmission System are guided by the CMP Transmission & Distribution Interconnection Requirements for Generation.

7 7 7 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Augusta Area Reliability Study Bowman St Substation Add 2 nd 115/34.5 kV transformer Bowman St 115/34.5 kV transformer overloaded and low 34.5 kV bus voltage, post-contingency 2011Under Construction Coopers Mills Substation Add 115/12.47 kV transformer at Coopers Mills (Maxcy's) Coordinate w/MPRP Voltage violations following loss of Maxcys 115/34.5 kV transformer 2014Proposed

8 8 8 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Bath Area Bath Area Load Study Line work Rebuild 34.5 kV Sections 55 & 58 Overloaded under single element contingency conditions 2011 Under Construction

9 9 9 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In- Service Date Status Berwick - Lebanon Area Reliability Study Bassett Substation New 34/12 kV Bassett Substation and 2 nd 34.5 kV transmission line to Quaker Hill Experiencing high load growth, thermal restriction on Section Under Construction Berwick Substation New 34/12 kV Berwick Substation and 34.5 kV transmission line to Bassett Load growth, inadequate 34/12 kV capacity, overloaded distribution circuits 2013Planned New Lebanon Substation Add new Lebanon Substation and 34.5 kV transmission line to Butler’s Corner Load growth in Lebanon area will exceed area capacity 2013 Planned

10 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Brunswick - Topsham Area Brunswick - Topsham Area Study Bath Substation Install a 115 kV bus-tie breaker at Bath Substation Severe Low Voltage occurs with a Bath 115 kV bus-fault 2013Proposed Line work Re-rate 34.5 kV Section 76 Overloaded under single element contingency conditions 2013Proposed Brunswick Hydro Substation Upgrade Brunswick Hydro T1 34/12 kV transformer Overloaded under normal operating conditions 2013 Proposed Woolwich Substation Upgrade Woolwich T1 34/12 kV transformer Overloaded under normal operating conditions 2014Proposed Topsham Substation Upgrade Topsham T2 34/12 kV transformer Overloaded under normal operating conditions 2014Proposed

11 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Brunswick - Topsham Area Brunswick - Topsham Area Study (Cont) Topsham 115 kV Substation Upgrade Topsham 115 kV T1 and T3 115/34.5 kV transformers Overloaded under single element contingency conditions 2014Proposed

12 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Lakes Region Lakes Region Area Reliability Study Lovell Area Upgrades New (9.5 mile) 34.5 kV line from Bridgton to Kimball Road Voltage violations under contingent system conditions 2015 Concept Install a 5.4 MVAR capacitor bank at Kimball Road 2015Concept Install a 5.4 MVAR capacitor bank at Lovell 2015Concept Remove voltage supervision for the reverse power relaying on Lovell T1 Back feeding NH under post- contingent conditions creates voltage and thermal violations 2013 Proposed North Limington Upgrades Two 34.5 kV breakers, two 5.4 MVAR capacitor banks Voltage violations under contingent system conditions 2015 Concept

13 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In- Service Date Status Lakes Region Lakes Region Area Reliability Study (Cont) Raymond Area Upgrades New North Raymond 115/34 kV S/S with a four breaker ring bus and 115/34 kV transformer and (10 mile) 115 kV transmission line to Surowiec Voltage and thermal violations under contingent system conditions 2015Concept Relocate Raymond 34 kV S/S Room needed for expansion 2015Concept New (4.5 mile) 34.5 kV line from Raymond 115 kV to Raymond 34 kV Voltage and thermal violations under contingent system conditions 2015Concept New (6 mile) 34.5 kV line from North Raymond to Raymond 34 kV Voltage and thermal violations under contingent system conditions 2015 Concept

14 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Lewiston - Auburn Area Reliability Study Leeds Substation Build a new Leeds 115/34.5 kV distribution substation Voltage violations and overloaded transformer at Turner 2012 Under Construction Line work Change protection settings on Section kV line overload post- contingency 2013 Proposed Great Falls Substation Replace Section 148 cable into Great Falls Substation 34.5 kV line overload post- contingency 2013 Proposed Gulf Island Substation Upgrade Gulf Island 115/34.5 kV T1 transformer Transformer overloaded with load growth, coordinate with MPRP reinforcements 2020 Concept

15 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Midcoast Area NTA Analysis (the Camden - Rockland Area Reliability Study) Park St Substation Add 5.4 MVAR 34.5 kV capacitor bank Low voltage2011 Under Construction Add 3.6 MVAR 34.5 kV capacitor bank Low voltage2013 Proposed Meadow Rd Substation Add two 5.4 MVAR 34.5 kV capacitor banks Low voltage2011 Under Construction Line Work Add 1 mile 34.5 kV line to separate Section 51 (Warren – Waldoboro) Voltage and thermal violations under contingent system conditions (Not needed if NTA is approved) 2013 Proposed

16 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Midcoast Area NTA Analysis (Cont) Boothbay Upgrades Add a 2.7 MVAR capacitor bank at Boothbay Low voltage2013Proposed Power Factor Correction at Boothbay Harbor 12 kV Low voltage2013Proposed Mason Upgrades Relay Modifications on Section 25 at Mason 34.5 kV line overload post- contingency 2013Proposed Line Work Rebuild 34.5 kV Section 23 Voltage violations under contingent system conditions (Not needed if NTA is approved) 2013Proposed Coopers Mills Upgrades Upgrade Coopers Mills T1 115/34 kV Transformer overloaded post- contingency 2013Planned

17 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Portland Area NTA Analysis Raven Farm Expansion (115/34.5 kV) New 115 kV bus with four breaker, breaker-and-a-half configuration. Also, install a 115/34 kV transformer and 34.5 kV line to Elm Street Voltage and thermal violations under contingent system conditions (Not needed if NTA is approved) 2015Proposed Line work Rebuild 34.5 kV Section 181 Overloaded under single element contingency conditions (Not needed if NTA is approved) 2015Proposed Rebuild a portion of 34.5 kV Section 180 Overloaded under single element contingency conditions 2015Proposed

18 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Portland Area NTA Analysis (Cont) Red Brook Upgrade Red Brook T1 to a 30/50 MVA Transformer overloaded under contingent system conditions (Not needed if NTA is approved) 2015Proposed

19 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Portland North Area Reliability Study Line work Re-rate portions of 34kV line Section 102 Thermal violations under normal operating and contingent system conditions 2011Under Construction Bishop Street Substation Add 2-34 kV breakers on Section 188 Violation of 25 MW loss of load criterion 2011 Under Construction Line work Rebuild portions of 34.5 kV line Section 188 Thermal violations under normal operating and contingent system conditions 2012Under Construction Line work Re-rate/rebuild portions of 34kV line Section 180A Thermal violations under normal operating and contingent system conditions (Not needed if NTA is approved) 2013 Proposed – Pending NTA conclusion

20 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Portland North Area Reliability Study (Cont) Voltage support Add two 2.7 MVAR capacitor banks at Freeport Voltage violations under contingent system conditions 2013Proposed Voltage support Add two 5.4 MVAR capacitor banks at North Windham S/S Voltage violations under contingent system conditions 2013Proposed Bishop Street Substation Add a 5.4 MVAR capacitor bank Voltage violations under contingent system conditions 2013 Proposed Elm Street Substation Bring S164 in/out of Elm St, re-rate S164A Thermal violations under contingent system conditions (Not needed if Raven Farms 115 kV is built) 2013 Proposed –Pending NTA conclusion

21 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Portland North Area Reliability Study (Cont) Line work Rebuild Section 103 Could overload under normal operating and/or single element contingency conditions in Planned Falmouth Substation Add two 34.5 kV breakers Voltage and 25 MW loss of load criteria violations under contingent system (Not needed if hybrid NTA is approved) 2013 Proposed –Pending NTA conclusion Swett Rd. Substation Add two 34 kV breakers Low Voltages in the local area under single element contingencies 2014 Proposed – Pending Lakes Region Area Reliability Study results East Deering Substation kV substation with 115 kV line from Raven Farm. Additional source needed in the area (Not needed if NTA is approved) 2015 Proposed –Pending NTA Analysis

22 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Portland North Area Reliability Study (Cont) North Yarmouth Substation New 115/34kV S/S tapped from Sect 166, and 14.8 mi 34.5 kV line to Gray & Freeport with breakers Voltage violations under contingent system conditions (Not needed if hybrid NTA is approved) 2015 Proposed –Pending NTA Conclusion Swett Road Substation Add 5.4 MVAR capacitor bank Voltage violations under contingent system conditions 2016 Proposed – Pending Lakes Region Area Reliability Study results Prides Corner Substation Add an additional 5.4 MVAR capacitor bank Voltage violations under contingent system conditions (Not needed if hybrid NTA is approved) 2018 Proposed –Pending NTA Conclusion

23 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Saco Bay Area Reliability Study New Vallee Lane Substation New 115/34.5 kV Substation in Old Orchard Beach and 115 kV double-circuit line from Louden to Old Orchard Beach Additional 115 kV transformer capacity and voltage support is needed in the Saco Bay Area. Loss of Section 193 violates CMP’s 25 MW loss of load criterion Under Construction New Goosefare Substation New 115/12 kV substation in Saco

24 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Skowhegan Area Reliability Study Line work Re-rate Section 73 Overloaded under single element contingency conditions 2011 Under Construction Norridgewock Source Tap Section 73, install 34/34 delta- wye isolating transformer for new distribution supply Distribution circuit becoming overloaded, need a new source 2012Under Construction Lakewood Substation Expansion Loop Section 241 into a new 115 kV ring bus with 2 nd 115/34.5 kV transformer Voltage violations under contingent system conditions 2013Under Construction

25 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Waterville - Winslow Area Waterville - Winslow Area Reliability Study Line work Re-rate portions of 34.5 kV line Section 38. Overloaded under single element contingency conditions 2012Planned Belgrade Source / Hospital Feed Install a 115/34 kV transformer and two 115 kV breakers at North Augusta with a new 34.5 kV distribution circuit into the Belgrade area. Reliability and voltage concerns on a very long 34.5 kV distribution circuit out of Rice Rips; need to bring in a new source to shift load. The addition of a new hospital is also driving these upgrades. 2012Planned Line work Re-conductor a portion of 34.5 kV line Section 56. Overloaded under single element contingency conditions 2013 Proposed

26 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Waterville - Winslow Area Waterville - Winslow Area Reliability Study (Cont) Line work Re-rate portions of 34.5 kV line Section 13. Overloaded under single element contingency conditions 2013 Proposed Line Work Re-rate 34.5 KV overhead portion of Section 38B Overloaded under single element contingency conditions 2013 Proposed Rice Rips Substation Bring the new line Section 241 in/out of Rice Rips by constructing 7 miles of new 115 kV Transmission. Also, upgrade Rice Rips into a 4- breaker ring bus with a second 115/34 kV transformer. Voltage and thermal violations under contingent system conditions 2014Proposed

27 LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In-Service Date Status Maintenance - Reliability Inspection Bristol Substation Upgrade Bristol T1 Overloaded under normal operating conditions 2012 Planned Bar Mills Substation Upgrade Bar Mills T4 South China Substation Upgrade South China T1 Line work Rebuild Sections; 5A, 48, 172, 187 These 34.5 kV line sections are in very poor condition and need to be rebuilt to improve reliability. 2013Planned Vassalboro Substation Move Section 40 termination to Vassalboro. Move two 34.5 kV breakers to Vassalboro. CMP Facilities at the Fort Halifax Substation are being retired and moved to the Vassalboro Substation 2012Under Construction

28 LSP Generation Projects Generator ID Project DescriptionStatus Projected In- Service Date Current Progress ISO-NE Queue # 215 Interconnection Request for 50 MW Wind Farm to tap into CMP 115 kV Section 270 north of Rumford 115 kV Substation Planned2013 System Impact Study Complete & interconnection agreement executed ISO-NE Queue # 244 Interconnection Request for 117 MW Wind Farm to tie into CMP Wyman Hydro Substation Proposed2013System Impact Study Complete ISO-NE Queue # 287 Interconnection Request for 33 MW Wind Farm to tie into CMP 115 kV Line Section 229 between Rumford Substation and Riley Substation Planned2013 Undergoing System Impact Study

29 LSP Generation Projects Generator ID Project DescriptionStatus Projected In- Service Date Current Progress ISO-NE Queue # 300 Interconnection Request for 20 MW Wind Farm to tie into CMP 115 kV Line Section 229 between Rumford Substation and Riley Substation Planned2013System Impact Study Complete ISO-NE Queue #310 Tied to Queue #138 Interconnection Request for 45 MW Wind Farm to tie into Customer owned 115 kV line Section 267 north of Bigelow Substation. Concept2012 Undergoing System Impact Study ISO-NE Queue #333 Interconnection Request for 216 MW Wind Farm to tie into CMP. Three potential interconnection sites to be studied. Concept2012 Undergoing Feasibility Study

30 LSP Generation Projects Generator ID Project DescriptionStatus Projected In- Service Date Current Progress ISO-NE Queue #335 Interconnection Request for 25 MW biomass generator at existing customer site. Planned2012System Impact Study Complete ISO-NE Queue #337 Interconnection Request to true-up the existing generating plant net output and add a net increase of 26 MW at existing customer site, Section 227. Planned2012System Impact Study Complete ISO-NE Queue #350 Interconnection Request to interconnect into 3-Points of interconnection Concept2013 Undergoing Feasibility Study ISO-NE Queue #366 Interconnection Request for 13.4 MW increased capacity at existing customer site. Concept2012 Undergoing System Impact Study Study ISO-NE Queue #372 Interconnection Request for 3 MW increased capacity at existing customer site. Concept 2012 phase A 2013 phase B Undergoing System Impact Study

31 In-Service LSP Projects Project Origin Major Project Project Description Needs Assessment Projected In- Service Date Status Augusta Area Reliability Study Line work Re-rate 34 kV line Sections 39 & 41 to 212°F thermal limit Overloaded under normal operating conditions 2011In Service

32 In-Service LSP Generation Projects Generator ID Project DescriptionStatus Projected In- Service Date Current Progress ISO-NE Queue # 138 Rebuild Bigelow Substation Wyman Hydro Substation Upgrades Re-rate Sect 215 Several area capacitor banks In Service2009 Met Developer’s Interconnection Request & Implemented the Recommendations contained in the I.3.9 Proposed Plan Application ISO-NE Queue # 290 System Impact Study Complete In Service Back-feed 10/15/ Met Developer’s Interconnection Request for 20 MW Wind Farm to tie into CMP Woodstock Substation ISO-NE Queue # 197 New 115 kV line Section 270 (old Section 59) New Roxbury Substation Move 115/34 kV transformer from Rumford to Roxbury In Service 2011 Met Developer’s Interconnection Request to connect 50.6 MW Wind Farm to new CMP 115 kV Section 270

33 LSP Future Studies Study Projected Study Date StatusNeeds AssessmentSolutions Portland North Area Reliability Study Dec 2010In Review Re-affirm timing and need of projects from the original study. Re-assessing transmission and NTA requirements Mid-coast Area Reliability Study Dec 2010In Review Re-affirm timing and need of projects from the original study. Re-assessing transmission and NTA requirements Lakes Region Area Reliability Study 2011In Progress Contingency processor showed thermal and voltage violations under single element contingencies Conduct area reliability study and assess possible system upgrades Southern Maine Area Reliability Study 2012Concept Contingency processor showed thermal and voltage violations under single element contingencies Conduct area reliability study and assess possible system upgrades Augusta Area Reliability Study 2013Concept Contingency processor showed thermal and voltage violations under single element contingencies Conduct area reliability study and assess possible system upgrades

LSP Presentation QUESTIONS?

35 Augusta Area Go BackGo Back to Augusta Go Back Go Back to Winslow

36 Skowhegan Area Go Back

37 Portland North Area Go Back

38 Waterville/Winslow Area Go Back

39 Lakes Region Area Go Back

40 Brunswick/Topsham Area Go BackGo Back to Bath Go BackGo Back to Topsham

41 CMP’s 14 Local Planning Areas Go Back