BremnerTrio Feasibility Study Report - BC Hydro - Transmission

Feasibility Study ForXXXXBremner/Trio Small Hydro Project(A117)Report No: SPPA2009-64February 2009System Planning & Performance Assessment, BCTC© British Columbia Transmission Corporation, 2008. All rights reserved.

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 2009Revision TableRevision Number Date of Revision Revised Byiii SPPA2009 – 64

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 2009Table of ContentsDISCLAIMER...........................................................................................................iCOPYRIGHT NOTICE.............................................................................................iiRevision Table...........................................................................................................iii1.0 General............................................................................................................12.0 Study Purpose and Scope................................................................................13.0 Study Assumptions .........................................................................................24.0 Study Results and Required Upgrades............................................................25.0 Cost Estimate and Project Schedule ...............................................................26.0 Appendix A – Project Single Line Diagram and Location Map.....................47.0 Appendix B – Other Study Assumptions........................................................6iv SPA2009 – 76

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 20091.0 GeneralThe project reviewed in this feasibility study report is as described in Table 1 below.Project NameInterconnection Customer (IC)Point of Interconnection (POI)Table 1: Summary Project InformationBremner / Trio Small Hydro ProjectXXXXUpper Harrison Terminal substationat north end of Harrison LakeIC Proposed COD April 1, 2014Type of Interconnection Service NRIS ERISMaximum Power Injection (MW) 45 (Summer) 45 (Winter)Number of Generator Units 4Plant FuelHydroThe Interconnection Customer proposes to build the Bremner / Trio Small Hydro Project locatedon the west side of the northern end of Harrison Lake. The subject project is comprised of theBremner generating station with two 10 MW Pelton units and the Trio generating station withtwo 12.5 MW Pelton units. The two plants are connected by 6 km of 138 kV overheadtransmission line. The 138 kV line continues from the Bremner generating station north for 17km to a new customer-owned 138 / 360 kV transformer near the BCTC 360 kV Upper HarrisonTerminal (UHT) Substation. The IC’s proposed COD is April1, 2014.The project interconnection single-line diagram and the project location map are included inAppendix A.2.0 Study Purpose and ScopeThis feasibility study is a preliminary evaluation of the system impact and cost ofinterconnecting the subject project to the British Columbia Transmission Corporation (BCTC)controlled transmission system based on power flow and short circuit analyses only andinvestigates potential system constraints associated with the interconnection of the project. Thisstudy is intended solely to assess the feasibility of integrating the generating unit or units of theInterconnection Customer, IC (or IPP), into the BCTC transmission system. It is also meant toprovide the IPP with a non-binding good faith cost and schedule estimate to construct theinterconnection facilities.This is a “limited scope” study which is restricted to only power flow and short circuit analysisin accordance with the BCTC Open Access Transmission Tariff (OATT). This study does notinclude stability analysis, harmonic mitigation, electro-magnetic transient analysis, and otheranalytical studies or calculations which normally form part of a comprehensive system study.This study also does not include a consideration of First Nations or property acquisition issues,nor the potential for such issues to affect the cost and scheduling estimates for theinterconnection facilities in this report..Page 1 of 6 SPPA2009 – 64

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 20093.0 Study AssumptionsA number of assumptions have been made for purposes of conducting this feasibility study. First,BCTC relied upon the information provided by the IC in its Interconnection Request. Additionalstudy assumptions are provided in Appendix B.4.0 Study Results and Required UpgradesThe power flow analysis indicates that the proposed new generation in Bremner and Trio will notresult in BCTC equipment or lines exceeding design ratings.A new 360 kV circuit breaker is required to expand the UHT 3-breaker ring bus into a 4-breakerring bus. Depending on the physical location of the customer owned transformer T1, the IC maybe required to have its own 360 kV circuit breaker to switch the transformer.The short circuit assessment indicates that the proposed new generation in the subject projectresults in short circuit currents that will not exceed the ratings of BCTC equipment. Noadditional station equipment upgrade is required to facilitate the interconnection of the Bremner /Trio Small Hydro Project.The existing control and protection systems at the UHT substation will need to be modified andnew protection and control schemes will need to be added to accommodate the installation ofnew facilities. SCADA work will be required at UHT, Fraser Valley Office Control Centre(FVO), and at the Bremner / Trio generating stations to integrate the new UHT facilities and IPPgeneration into the existing SCADA system. Included in this work will be the updating of databases and SCADA displays at FVO.5.0 Cost Estimate and Project ScheduleTable 2 lists the facilities required for system upgrades to interconnect the proposed project tothe BCTC transmission system. It also provides a non-binding good faith cost estimate for theinterconnection costs.For the Feasibility Study, it is not possible to allocate the estimated interconnection costsbetween Network Upgrades (NU) and Transmission Provider Interconnection Facilities(TPIF). However, BCTC notes that Transmission Provider Interconnection Facilities aretypically limited to a single span of transmission line entering the substation from the substationboundary.Table 2: Cost Estimate for the Required System UpgradesWork DefinitionStationFacilitiesStation Expansion and ModificationEstimated Interconnection Cost (2009 dollars):EstimatedCost$ 7,822 kPage 2 of 6 SPPA2009 – 64

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 2009The estimated time to implement the system upgrades required to interconnect the project to theBCTC transmission system is indicated by the check mark in Table 3. This estimate reflectsconstruction duration as well as the requisite time for land acquisition, permitting, andcommissioning.Table 3: Estimated Project Implementation Schedule0 - 6 months 36 - 42 months6 -12 months 42 - 48 months12- 18 months 48- 54 months18 - 24 months 54 - 60 months24 – 30 months 60 – 66 months30 - 36 months 66 - 72 monthsAssuming that the Standard Generator Interconnection Agreement (SGIA) for the project issigned by March 7, 2010, according to the timelines required of the Standard GeneratorInterconnection Procedures (SGIP), the proposed COD of April 1, 2014 can be met.This study does not include stability analysis, harmonic mitigation, electro-magnetic transientanalysis, and other analytical studies or detailed operation studies which normally form part of acomprehensive system study. Equipment that may be determined during more comprehensivestudies is not included in the cost estimate or considered in the estimated schedule providedherein.Page 3 of 6 SPPA2009 – 64

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 20096.0 Appendix A – Project Single Line Diagram and Location MapProject Single Line DiagramPOIPage 4 of 6 SPPA2009 – 64

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 2009Project Location MapApproximate location of Bremner / Trio and UHT stations.UHTBremnerTrioPage 5 of 6 SPPA2009 – 64

Feasibility Study for Bremner/Trio Small Hydro Project (A117) Feb. 20097.0 Appendix B – Other Study AssumptionsAssumptions related to the BCTC transmission system:Power FlowPower flow is based upon the base cases that include generation, transmission facilities, and loadforecast representing the queue position applicable to the study of this project. Applicableseasonal conditions and the appropriate number of study years for the study horizon have alsobeen incorporated.Financial and Estimating AssumptionsCost estimates are based on an order of magnitude assumption, are non-binding and provided ingood faith. The cost estimate included in this report does not and cannot account for a variety ofissues not under the control of BCTC including, but not limited to:The impact of additional equipment required as the result of more detailedcomprehensive studies;Actual equipment specified during engineering design;Fluctuations in costs over time;First Nation considerations;Property-related costs and issues;Any Certificate of Public Convenience and Necessity (CPCN) required from the BritishColumbia Utilities Commission (BCUC);Physical space constraints for network facilities.Page 6 of 6 SPPA2009 – 64