1 About Tri-State Incorporated in 1952, Tri- State is a generation - PowerPoint PPT Presentation

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About Tri-State Incorporated in 1952, Tri- State is a generation and transmission cooperative (“G&T”) operating on a not- for-profit basis. Tri-State Our mission is to was formed by its Member provide our members Systems for the purpose of a reliable, affordable providing wholesale power and responsible and energy to its Members supply of electricity for resale to their retail in accordance with consumers. Tri-State is cooperative controlled by a 43 seat principles. Board of Directors, with each of Tri-State’s 43 Members occupying one seat on the Board. 2

Tri-State’s Transmission System Tri-State delivers reliable power to communities across nearly 200,000 square miles of the west, from the eastern plains through the Rocky Mountains and down to the southern deserts. We own or operate more than 5,665 miles of high-voltage lines, supported by our system of 220 substations and telecommunications sites. 3

This Meeting  Participation in Tri-State’s local planning process is open to all interested parties, including but not limited to, all network and point-to-point transmission service customers, interconnecting neighboring transmission providers, regulatory agencies, and other stakeholders.  Promote discussion of all aspects of the Tri-State transmission planning activities, including, but not limited to, methodology, study inputs, public policy requirements, study results, and alternative solutions.  Provide a forum for Tri-State to better understand the specific electric transmission interests of all stakeholders. 4

Purpose  Review Tri-State’s transmission planning processes.  Summarize the status of Tri-State’s generator interconnection queue.  Provide updates on its developing and planned projects.  Receive transmission study requests from stakeholders for review and discussion.  Solicit information from its Transmission Customers on loads and resources and other needs, such as public policy requirements, for the preparation of its ten-year plan. 5

Note  This is not the only forum to be involved.  This meeting will be supplemented by additional stakeholder outreach activities in connection with individual transmission projects or overall programmatic needs, as necessary.  Colorado Coordinated Planning Group (CCPG)  Voluntary, open transmission planning forum.  Membership is open to all interested stakeholders.  Includes all Colorado transmission utilities  http://regplanning.westconnect.com/ccpg.htm 6

Planning Processes 7

Planning Considerations  Tri-State endeavors to conduct transmission planning with the goal of achieving best-cost solutions that balance numerous factors and result in optimal transmission projects: Load projections  New delivery points  NERC reliability standards  Generation resources and interconnections  Project partnership opportunities  Regional congestion  Transmission corridors  City and county zoning  Geographic features  Societal and environmental impacts  Operational and maintenance requirements  Consistency with short term and long term planning opportunities  Initial construction cost  8

Planning Processes: NERC Compliance 9

Study Process and/or Methodology for Other Studies Summary of Tri-State’s Generator Interconnection Process:  https://www.oasis.oati.com/woa/docs/TSGT/TSGTdocs/Generator_Interconn ection_Process_(summary_version)_6-6-19.pdf EMTP Model Requirements:  https://www.oasis.oati.com/woa/docs/TSGT/TSGTdocs/Transmission_Provid er's_EMTP_Requirements.pdf Engineering Standards Bulletin (Transmission Planning Criteria, etc.)  https://www.oasis.oati.com/woa/docs/TSGT/TSGTdocs/ESB_8_2019_final.p df 10

Local vs Regional Planning Relationship between local and regional planning processes: 20 Year (for consideration and context) WestConnect Scenarios Base SSPG, Local Sub Regional Transmission SWAT Plans Planning Plan Processes Regional Stakeholder Local Scenarios participation Stakeholder Working WestConnect Group Regional Economic Models (CCPG, etc.) Needs/Alternatives (w/ pancaking) Evaluation Regional Plan 11

Study Process for Resource Portfolios Generation Studies: Determination Transmission Studies: Impacts of of Portfolio(s) Portfolio(s) Site Specific Studies Planning Production Portfolio Reserve Cost Dynamic Delineation Power Flow Margin Modeling Simulations Modeling Upgrades to Portfolio Support Reliability Portfolio 12

Required Studies Powerflow Studies  Contingency analysis (P0-P8 per NERC TPL-001-04)  Monitor for overloads and voltage issues  Identify areas for local, site-specific studies 13

Required Studies Dynamic Simulations  Monitor frequency response  Monitor governor response, rotor angle stability, out of step  Voltage instability and ride through  Dynamic VARS 14

Required Studies Localized Studies  Controller interactions  Flicker  Harmonics  Weak Grid 15

Tri-State Active Generator Interconnection Queue 16

Tri-State Active Generator Interconnection Queue 17

Tri-State Generator Interconnection Queue Summary of Tri-State’s Generator Interconnection requests in Deferral:  https://www.oasis.oati.com/woa/docs/TSGT/TSGTdocs/Deferred_Interconne ction_Request_Queue.pdf Summary of Tri-State’s Generator Interconnection requests with GIAs:  https://www.oasis.oati.com/woa/docs/TSGT/TSGTdocs/GIA_Interconnection _Request_Queue.pdf 18

Projects 19

Project Status Categories  Developing Some objectives and needs have been identified. Some alternatives  have or are being considered, but stakeholder proposed alternatives are also requested. Conceptual  Conceptual/hypothetical objectives and needs. Alternative(s) has been  decided. Project drivers are uncertain.  Planned Objectives and needs are clear at the current time, but are subject to  change. Alternative(s) has been decided. Project drivers have sufficient certainty.  Under-Construction Board approved project. Project has started accruing costs due to  preliminary activities (i.e. design, routing, permitting, regulatory activities), and/or actual construction. 20

Projects: Wyoming (1, 2) 21

Developing Projects in Converse County Wyoming Converse County Oil Development Complete a joint planning effort between PACE, Tri-State, Petroleum Association of Purpose: Wyoming (PAW) and Wyoming Legislature to meet oil and gas development requirements without duplicative transmission facilities PAW compiled 5 year load projections for Status: expected oil and gas development throughout Converse County Rocky Mountain Power and Tri-State Member Niobrara Electric Association combined planning efforts to identify transmission infrastructure needs Rocky Mountain Power has contracted for 200 MW Cedar Springs Windfarm currently under construction. Rocky Mountain Power will explore possible dual use of Cedar Springs 25 mile 230 kV transmission line Develop possible transmission alternatives Schedule: by Sept 30, 2019 22

Wayne Child Phase II Cheyenne 23

Wayne Child Phase II Sectionalize Laramie River Station (LRS) – Description: Story 345kV line at the existing Wayne Child substation. Voltage: 345 kV Length: 0 miles Type: Substation. Status: Under Construction. Planned 2022 ISD: Purpose: Load Serving, increased transfer capabilities. 24

Snowy Range Project Cheyenne 25

Snowy Range Project A new 115 kV breaker bay at the existing Western owned Snowy Range Substation and 1.5 miles of new 115 kV transmission line on Description: wood H-Frame structures sourced at a newly constructed breaker bay at Snowy Range and intersecting the Gem City-Ft. Sanders 115 kV transmission line at Gem City Tap Voltage: 115 kV Length: 1.5 miles Type: Substation and Line Status: Under Construction. Planned 2020 ISD: Purpose: Load Serving. 26

Projects: Colorado (1, 23) 27

Developing Project in Colorado: Lamar Front Range Task Force Lamar Front Range Coordinated Colorado Planning Group Task Force to evaluate transmission expansion alternatives to improve Purpose: generation export capacity from eastern Colorado to load-serving regions along the Front Range. Status: Studies currently in progress. • First-pass of results eliminated several alternatives due to lack of Generation benefit. Pocket • Several alternatives were combined to assess impact of a larger alternative on export capability. • Combined alternatives can improve export capacity between 1600-2000 MW, but costs range between $650M–850M Report to be finalized by end of year Participate: Schedule: http://regplanning.westconnect.com/ccp g_lamar_tf.htm 28

Burlington (TS) – Burlington (KC) 115 kV Craig Burlington Montrose Lamar Pueblo 29

Burlington (TS) – Burlington (KC) 115 kV Description: Reconductor with 795 ACSR. Voltage: 115 kV Length: 1.94 miles Type: Line. Status: Planned Planned 2022 ISD: Purpose: Accommodate distribution system load shifting. 30

Burlington – Lamar 230 kV Transmission Project Craig Burlington Montrose Lamar Pueblo 31