Feasibility Study For XXXX NW Stave River Project (A082)

Feasibility Study for NW Stave River Project (A082) Feb 20091.0 GeneralThe project reviewed in this feasibility study report is as described in Table 1 below.Table 1: Summary Project InformationProject NameNW Stave River ProjectInterconnection Customer (IC)XXXXPoint of Interconnection (POI) Upper Harrison Terminal substation (UHT)IC Proposed COD June 30, 2012Type of Interconnection Service NRIS ERISMaximum Power Injection (MW) 18.4 (Summer) 18.4 (Winter)Number of Generator Units 3Plant FuelHydroThe Interconnection Customer proposes to build the NW Stave River Project, located nearHarrison Lake, British Columbia. The subject project is comprised of three hydro generatingunits at 6.47 MW each, interconnecting to the Upper Harrison Terminal (UHT) substation viatwo 360/138 kV transformers at UHT and a 138 kV line from their generating site. The IC’sCOD is June 30, 2012.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 – 69

Feasibility Study for NW Stave River Project (A082) 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 NW Stave River will notresult in BCTC equipment or lines exceeding design ratings.The short-circuit study concluded that the increase in the fault levels due to the integration of theNW Stave River project will not bring the short-circuit currents beyond the ratings of BCTCequipment.Protection for the IC’s line at UHT 360 kV Substation is existing and adequate. Therefore, notelecom or SCADA work will be required at UHT. However, the additional generation has to beintegrated into the existing SCADA system at NW Stave River facilities and as such updating ofthe data bases and displays at the BCTC Fraser Valley Office control center is required.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 DefinitionFacilitiesPlanning and Operation UpdateMinorEstimated Interconnection Cost (2009 dollars):EstimatedCost$ 34 kPage 2 of 6 SPPA2009 – 69

Feasibility Study for NW Stave River Project (A082) Feb 20096.0 Appendix A – Project Single Line Diagram and Location MapProject Single Line DiagramPage 4 of 6 SPPA2009 – 69

Feasibility Study for NW Stave River Project (A082) 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 theBritish Columbia Utilities Commission (BCUC);Physical space constraints for network facilities.Cost of RAS and the cost associated with operating requirements such as updatingLocal Operating Orders, operating one-line diagrams, etc.Page 6 of 6 SPPA2009 – 69