1 1 1 Central Maine Power Local System Plan Presentation Planning Advisory Committee Meeting November 19, 2008

2 2 2 Local System Plan (LSP) Communication Per Attachment K – Local, this LSP presentation: Describes projected improvements to non-PTF that are needed to maintain reliable customer service. LSP is presented at a Planning Advisory Committee meeting once a year PAC, Transmission Customers, and other Stakeholders have 30 days to provide written comments for consideration to CMP –CMP’s contact: David M. Conroy Manager System Planning Central Maine Power Company 83 Edison Drive Augusta, Maine (

3 3 3 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

4 4 4 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 Proposed Planned Under Construction In-Service

5 5 5 CMP’s Local System Planning Process All CMP system upgrades are determined in accordance with Central Maine Power Company Transmission Planning Criteria. Planning studies can result from: –Periodic Assessment of CMPs 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.

6 6 6 LSP Projects NeedProjected In-Service Date Major Project StatusNeeds AssessmentSolutions Load Growth/ Sub-Area Study June 2009Boothbay Area Reliability Study Newcastle Substation Under Construction Several transmission elements could overload under normal operating conditions in 2010 Add 2 nd transformer, re-rate five 34.5 kV lines, add 115 kV breakers, add 5.4 MVAR capacitor bank Load Growth/ Sub-Area Study May 2009Edgecomb Substation Under Construction Potential widespread low voltage, post-contingency Add 34.5 kV breakers, add 5.4 MVAR capacitor bank Load Growth/ Sub-Area Study February 2009 Boothbay Substation Under Construction Potential Low Voltage, post-contingency Add 5.4 MVAR capacitor bank Load Growth/ Sub-Area Study December 2008 Damariscotta Substation Under Construction Potential Low Voltage, post-contingency Add 3.6 MVAR capacitor bank

7 7 7 LSP Projects NeedProjected In-Service Date Major Project StatusNeeds AssessmentSolutions Load Growth/ Sub-Area Study 2010Augusta Area Reliability Study Line Re- ratings ProposedSeveral transmission elements could overload under normal operating conditions Re-rate 34 kV line Sections 39 & 41 Load Growth/ Sub-Area Study 2011Bowman St Substation ProposedPotential Bowman St 115/34.5 kV transformer overloaded and low voltage post-contingency Add 2 nd /34.5 kV transformer Load Growth/ Sub-Area Study 2011Maxcys Substation ProposedLow voltages following loss of Maxcys 115/34.5 kV transformer Add second transformer at Maxcys Coordinate w/MPRP Load Growth/ Sub-Area Study December 2008 Augusta East Side Substation Under Construction 115 kV Line Section 88 fault results in loss of 115/34.5 kV supply at Augusta East Side and low voltages Replace Augusta East Side 115 kV switch with a circuit breaker

8 8 8 LSP Projects NeedProjected In- Service Date Major Project StatusNeeds AssessmentSolutions Load Growth/ Sub-Area Study 2011Berwick - Lebanon Area Reliability Study Bassett Substation ProposedExperiencing high load growth, thermal restriction on Section 118 Add 2 nd 34.5 kV line from Quaker Hill to Bassett, new Bassett S/S Load Growth/ Sub-Area Study 2013Berwick Substation ProposedLoad growth, inadequate transformer capacity Add 34.5 kV transmission line Bassett to Berwick, new Berwick S/S Load Growth/ Sub-Area Study 2012New Lebanon Substation ProposedLoad growth in Lebanon area will exceed area capacity Add new Lebanon S/S, add 34.5 kV transmission line from Butler’s Corner Load Growth/ Sub-Area Study 2010High St Substation ProposedThermal restrictions on transmission elements Re-rate S114, S112A, S114A & S185

9 9 9 LSP Projects NeedProjected In-Service Date Major Project StatusNeeds AssessmentSolutions Load Growth/ Sub-Area Study 2010Camden- Rockland Area Reliability Study Camden Substation ProposedLow voltageAdd 5.4 MVAR capacitor bank Load Growth/ Sub-Area Study 2011Park St Substation ProposedLow voltageAdd 5.4 MVAR capacitor bank Load Growth/ Sub-Area Study 2011Meadow Rd Substation ProposedLow voltageAdd 10.8 MVAR capacitor bank Load Growth/ Sub-Area Study 2012Highland Substation ProposedNeed for post- contingent support in the area provided by a new 34 kV line. New 34 kV transmission line to Meadow Rd Add 1 mile 34.5 kV line to separate Warren – Waldoboro line

10 LSP Projects NeedProjected In-Service Date Major Project StatusNeeds AssessmentSolutions Load Growth/ Sub-Area Study 2008 & 2009Lewiston- Auburn Area Reliability Study Line Re-ratings Under Construction Potential 34.5 kV line overloads for normal operating conditions Re-rate five 34 kV lines: Sections 41, 45, 46, 50, & 72 Load Growth/ Sub-Area Study 2009Hotel Road Substation ProposedPotential post- contingency low voltages & overload of Hotel Rd 115/34.5 kV transformer Install 2 nd 115/34 kV transformer & 115 kV breaker at Hotel Road Load Growth/ Sub-Area Study 2012Gulf Island - Lewiston Lower Substations PlannedOverloading of Lewiston - Auburn Downtown Transmission Corridor Reinforce Gulf Island – Lewiston Lower transmission system via new 115 kV transmission line. Coordinate w/MPRP Load Growth/ Sub-Area Study 2009Leeds Substation PlannedLow voltage and transformer loading at Turner Leeds 115/34.5 kV substation

11 LSP Projects NeedProjected In-Service Date Major Project StatusNeeds AssessmentSolutions Load Growth/ Sub-Area Study 2011 & 2012Saco Bay Area Reliability Study New Ross Road & Goosefare Substations PlannedAdditional 115 kV transformer capacity and voltage support is needed in the Saco Bay Area. Loss of Section 193 violates CMP’s loss of load criterion. New 115 kV double- circuit line from Louden to Old Orchard Beach New 115/34.5 kV Substation in Old Orchard Beach Load Growth/ Sub-Area Study June 2010Section 174Planned34.5 kV line overload & condition Rebuild Section 174 Load Growth/ Sub-Area Study 2013Portland - North Area Reliability Study 2 nd Portland Loop ConceptSupport load growth in the Portland-North Area Study started. Potential for a 115 kV transmission line from Yarmouth to East Deering with 115/34.5 kV S/S Coordinate w/MPRP

12 LSP Projects NeedProjected In-Service Date Major Project ProjectStatusNeeds Assessment Solutions Load Growth/ Sub-Area Study 2012Mid-Coast Reliability Study Belfast Breakers ProposedLoss of Section 86 exceeds CMP’s loss of load criterion and results in low voltages Add 115 kV breakers at Belfast Build ~ 1 mile 115 kV tap line Add 10.8 MVAR 34.5 kV capacitor bank Coordinate w/MPRP Generator Interconnect 2009ISO-NE Queue # 138 Under Construction Meet Interconnection Request & Implement PPA requirements Rebuild Bigelow Substation Wyman Hydro Sect 215 termination Re-rate Sect 215 Several area capacitor banks Generator Interconnect 2009ISO-NE Queue # 197 RH ConceptRequest to connect 55 MW to CMP 34.5 kV Section 54 north of Rumford 115 kV Substation Undergoing System Impact Study

13 LSP Projects NeedProjected In-Service Date Major Project ProjectStatusNeeds AssessmentSolutions Generator Interconnect 2012ISO-NE Queue # 272 ConceptInterconnection Request for 100 MW to CMP 115 kV Section 222 north of Wyman Hydro Substation Undergoing Feasibility Study Generator Interconnect 2012ISO-NE Queue # 272 ConceptInterconnection Request for 68 MW to CMP 34.5 kV Section 54 north of Rumford 115 kV Substation Undergoing Feasibility Study Generator Interconnect 2009ISO-NE Queue # 215 LF ConceptInterconnection Request for 75 MW to CMP 34.5 kV Section 59 north of Rumford 115 kV Substation Undergoing System Impact Study Generator Interconnect 2010ISO-NE Queue # 244 HP ConceptInterconnection Request for 156 MW to CMP 115 kV Section 215 Undergoing Feasibility Study