2009 Scenario Reliability Assessment - NERC

Scenario Reliability Self-Assessmentsresources that are planned to come on-line in 2018 amounts to 4,292 MW. These additionalcapacity additions were taken from the 2009 Long Term Reliability Assessment.The generation mix of the Scenario Case and the Reference Case for 2018 includes wind,nuclear, hydro, coal (steam), oil (steam), oil (combustion turbine), gas (combustion turbine), oil(combined cycle), and a combination of other resources.For Future and Conceptual Capacity resources, SPP uses the Generation Interconnection (GI)and Transmission Service Request (TSR) study process as defined within the SPP Tariff. 97According to the SPP Tariff, at the time the Interconnection Request (IR) is submitted, anInterconnection Customer must request either Energy Resource Interconnection Service (ERIS)or Network Resource Interconnection Service (NRIS); any Interconnection Customer requestingNetwork Resource Interconnection Service may also request that it be concurrently studied forEnergy Resource Interconnection Service, up to the point when an Interconnection Facility StudyAgreement is executed. The Interconnection Customer may then elect to proceed with NetworkResource Interconnection Service or to proceed under a lower level of interconnection service tothe extent that only certain upgrades would be completed.Capacity Transactions on PeakApproximately 1 percent of SPP’s capacity margin depends on purchases from other Regions.Transactions for 2018 are 692 MW purchased from other Regions. These purchases areconsidered firm transactions; 150 MW is firm delivery service from WECC, administered underXcel Energy’s Open Access Transmission Tariff.SPP has a total of 786 MW of firm sales, which includes firm generation and transmission toRegions external to SPP. There are no known issues with the deliverability of imports or exportsbased on existing transmission.SPP members, along with neighboring members including Entergy and others in the SERCRegion, have formed a Reserve Sharing Group. Members of this group receive contingencyreserve assistance from other SPP Reserve Sharing Group members. SPP’s Operating ReliabilityWorking Group sets the minimum daily contingency reserve requirement (approximately 1,600MW) for the SPP Reserve Sharing Group. The SPP Reserve Sharing Group maintains aminimum first contingency reserve equal to the generating capacity of the largest unit ortransmission path scheduled to be on-line.TransmissionThe JCSP study identified several new transmission projects for the SPP Region. These projectsare needed to integrate an additional 20 percent wind into the Region. None of these transmissionprojects have an expected in-service date, as they are still considered conceptual. These projectswill be incorporated into the SPP Integrated Transmission Plan (ITP) in 2010, and will then beassigned in-service dates as needed for reliability or economic reasons. The following projectsare included in either the JCSP, the SPP Transmission Expansion Plan’s 10 year reliabilityassessment, or the Balanced Portfolio of economic upgrades:97 http://www.spp.org/publications/SPP_Tariff.pdf2009 Scenario Reliability Assessment Page 145