2009 Scenario Reliability Assessment - NERC

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Scenario Reliability Self-AssessmentsSPP HighlightsSouthwest Power Pool (SPP) will discuss wind penetration in thisScenario Reliability Assessment. Along with other entities in RFC,MRO, NPCC, 20 and SERC, SPP participated in the JointCoordinated System Plan 21 (JCSP) to examine the impact of windpenetration in the western part of the Eastern Interconnection,develop a conceptual transmission plan for 2024, and create areliability assessment for 2018. SPP has used the JCSP study as aguideline to discuss this Scenario Reliability Assessment.JCSP study results indicated that for the 20 percent wind energy Scenario Case, SPP would bean exporting Region with over 8,000 MW of wind energy. To accommodate this wind energy,about 1,800 miles of 765 kV transmission lines and 18 transformers would be needed toreinforce the lower voltage system. In anticipation of this scenario, SPP is planning to implementreal-time operational tools to manage operational issues expected in its Region.20 ISO New England Inc. (ISO-NE) and the New York ISO (NYISO) were not signatories to the JCSP.21 http://jcspstudy.org/2009 Scenario Reliability Assessment Page 19
Scenario Reliability Self-AssessmentsWECC HighlightsThe Western Electricity Coordinating Council (WECC) studied theeffect of one scenario of 15 percent renewables generation (byenergy) in the Western Interconnection in 2017. The scenario thatwas studied was not the only one that could have been constructedand other scenarios could lead to different specific results. However,the study, along with other efforts underway in WECC, did lead toseveral general overall conclusions.1. High levels of renewable generation, because of their spatial location relative to Westernload centers, can lead to stresses on the capacity of the transmission system and the needto increase that capacity to deliver the generation to load.2. High levels of variable renewable generation can raise significant operating challengesthat can require new institutional arrangements and business practices in order toeconomically maintain the ability of Balancing Authorities (BA) to meet NERC andWECC reliability standards.3. While high levels of renewable generation per se do not raise adequacy issues, highlevels of variable renewable generation, raise two kinds of adequacy issues.• First, it is important to evaluate how much variable generation can reliably beexpected to contribute to system peak.• Second, high penetrations of variable generation can require significant amountsof flexible resources to integrate that variable generation into the grid. Onlyresources with the ability to ramp up and down quickly — such as hydro,combustion turbines, storage resources, and certain demand-side managementresources — have the appropriate attributes to be able to integrate wind, solarphotovoltaic, and other variable renewable resources into the grid.4. High levels of renewable generation, typically with very low operating costs, would havea significant effect on generation and fuel use by those units typically on the margin (i.e.,gas generation) in the Western Interconnection. This could raise issues of gasprocurement and scheduling, though WECC was unable to study those issues. Natural gassupplies delivered through intra-state pipeline systems offer the greatest operatingflexibility when such systems are connected to gas storage projects. The areas in WECCthat plan to follow variable renewable output with gas-fired generation otherwise mayneed to have natural gas storage infrastructure built or inter-state pipelines would have toaccept day-after or real-time schedule changes.WECC and its members (utilities, state and provincial entities, independent generators, andothers) are addressing the issues raised by these conclusions.WECC has an extensive study program ongoing under the guidance of the TransmissionExpansion Planning Policy Committee (TEPPC). This work is performed in coordinationwith Western Subregional Planning Groups (SPG) and individual transmission providersto evaluate long-range needs for transmission expansion in the Western Interconnection.The coordination among the three levels of study efforts, interconnection-wide toindividual transmission provider, and the relationship of these groups and study efforts toPage 202009 Scenario Reliability Assessment
Page 1 and 2: 2009 Scenario ReliabilityAssessment
Page 3 and 4: Table of ContentsTable of ContentsN
Page 5 and 6: Executive SummaryTransmission Criti
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Regional Reliability Scenario Self-
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About This Reporto Nuclear scenario
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Joint Coordinated System PlanThemat
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Joint Coordinated System Plan2009 S
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Scenario LetterScenario LetterDecem
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Scenario LetterIn an effort to add
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Scenario Letterd) Provide a table,
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Reliability Assessment Subcommittee
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Reliability Assessment Subcommittee
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the reliability of theto ensurebulk
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2009 Scenario Reliability Assessment - NERC

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