Tri-State December 2013 Board Meeting 1
Who We Are Tri-State is a not-for-profit, wholesale power supplier owned by 44 electric cooperatives and public power districts serving a population of approximately 1.4 million people.
Purpose of This Public Meeting Involve all interested stakeholders in Tri-State’s transmission planning process. Review current study plan. Solicit information from transmission customers on potential loads and resources. Answer your questions.
Transmission Planning Objectives Provide Transmission Service to all network customers. Provide Reliable Service under NERC/WECC Reliability Standards. Provide Low Cost Service to Member owners. Provide Access to other stakeholders for the efficient planning, utilization and development of the transmission system.
Basic Statistics 5,396 miles of transmission in which Tri-State has an ownership or capacity interest: 1220 miles - 345 kV 1001 miles - 230 kV 184 miles - 138 kV 2942 miles - 115 kV 49 miles - 69 kV Over 220 bulk system substations David A. Hamil DC Tie at Stegall, NE Extensive high-speed communications system of fiber optics and microwave links for operation and control of the transmission system.
Transmission System
Telecommunications System 1500 miles of fiber 455 radio sites
Inputs to study plan Network Customers identify load and resource requirements annually. Other Transmission Providers update base case assumptions (system topology, loads and resources). Tri-State Member Systems request new delivery points throughout the year.
Inputs to study plan (continued) Generation Interconnection customers submit applications (two open seasons). Regulatory and governmental agencies introduce policy initiatives. Tri-State’s Board of Directors make decisions on capital expenditures.
Caballo – Mimbres 115 kV Rebuild Tri-State December 2013 Board Meeting 10
Caballo – Mimbres 115 kV Rebuild Description: Rebuild / re-conductor existing 115kV line with 477 MCM ACSR and steel pole H-frame structures. Voltage: 115 kV Length: 57 miles Type: Line Status: Continuing Planned ISD: 2019 Purpose: Replace aging structures and conductor. Increase capacity and improve load-serving capability and reliability to Sierra Electric.
Escalante – Gallup 115 kV Line Uprate Tri-State December 2013 Board Meeting 12
Escalante – Gallup 115 kV Line Uprate Description: Uprate existing line to a minimum of 80 MVA (400 amps). Voltage: 115 kV Length: 42 miles Type: Line Status: Continuing Planned ISD: 2015 Purpose: A reliability improvement to eliminate potential overloading of the existing line for NERC Category B contingencies.
Picacho – Las Cruces 115 kV Uprate Tri-State December 2013 Board Meeting 14
Picacho – Las Cruces 115 kV Uprate Description: Uprate existing line to 100 degrees C thermal rating (932 amps). Voltage: 115 kV Length: 3.5 miles Type: Line Status: Continuing Planned ISD: 2015 Purpose: A reliability improvement to eliminate potential overloading of the existing line for a NERC Category B contingency.
Gladstone 230 kV Phase Shifting Transformer Tri-State December 2013 Board Meeting 16
Gladstone 230 kV Phase Shifting Transformer Description: Install 300 MVA 230 kV +/- 60 degree PST at Gladstone Substation. Voltage: 230 kV Type: Substation Status: Complete Planned ISD: 2015 Purpose: Permits control of north to south flows into northern New Mexico and mitigates potential overloads on the 115 kV system.
18 Wayne Child Sub Additions Tri-State December 2013 Board Meeting
Wayne Child Sub Additions Description: Tap LRS-Story line adjacent to Archer. Add 345/230 kV 600 MVA transformer and 230 kV tie to Archer Substation. Voltage: 345 kV and 230 kV Length: 0 miles Type: Substation / Line Status: Continuing Planned ISD: 2018 Purpose: Improve Tri-State’s power delivery and load serving capabilities from its LRS generation. Project increases TOT3 transfer capability.
Southeast Wyoming Transmission Project Tri-State December 2013 Board Meeting 20
Southeast Wyoming Transmission Project Description: Construct a 230/115 kV 150 MVA substation connecting to the LRS-DJ line and a 115 kV transmission line to Belle Fourche. Voltage: 115 kV Length: 50 miles Type: Line Status: Continuing Planned ISD: 2016 Purpose: Improve load-serving capability and reliability to Niobrara Electric Association’s 69 kV system.
Wind River 115 kV Reliability Upgrade Tri-State December 2013 Board Meeting 22
Wind River 115 kV Reliability Upgrade Description: Construct a 230/115 kV interconnection to the PACE Wyopo Substation, a 115 kV ring bus at Wind River and a 115 kV line connecting the two substations. Voltage: 115 kV Length: 17 miles Type: Substation / Line Status: Planned Planned ISD: 2019 Purpose: Mitigate potential voltage stability issues and improve power delivery and load serving capabilities to the Wind River area.
24 Badwater–DJ 230 kV Project Tri-State December 2013 Board Meeting
Badwater-DJ 230 kV Project Description: Construct a 230 kV line between the Badwater substation and a new station sectionalizing the Dave Johnston (DJ) to LRS 230 kV line. Voltage: 230 kV Length: 117 miles Type: Substation / Line Status: Planned Planned ISD: To be determined Purpose: Increase power delivery and load serving capabilities to the Badwater area by approximately 180 MW. Increase TOT 4B ATC.
26 Big Sandy - Calhan Tri-State December 2013 Board Meeting
Big Sandy - Calhan Description: New 230 kV line between Big Sandy and Calhan Substations Voltage: 230 kV Length: 55 miles Type: Line Status: Planned Planned 2019 ISD: Purpose: Support Member load between Denver and Colorado Springs Tri-State December 2013 Board Meeting 27
Boone – Walsenburg 230 kV Line Tri-State December 2013 Board Meeting 28
Boone – Walsenburg 230 kV Line Description: Construct a 230 kV transmission line from Boone Substation to Walsenburg Substation Voltage: 230 kV Length: 69 miles Type: Line Status: Planned Planned To be determined ISD: Purpose: Reliability – eliminate the need for the existing Walsenburg Remedial Action Scheme (RAS) Tri-State December 2013 Board Meeting 29
30 Lamar – Boone 230 kV Line Tri-State December 2013 Board Meeting
Boone – Walsenburg 230 kV Line Description: Construct a 230 kV transmission line from Boone Substation to Lamar Substation Voltage: 230 kV Length: 100 miles Type: Line Status: Planned Planned To be determined ISD: Purpose: Accommodate potential increased resource injection at Lamar. Tri-State December 2013 Board Meeting 31
Burlington – Lamar 230 kV Transmission Project Tri-State December 2013 Board Meeting 32
Burlington – Lamar 230 kV Transmission Project Description: Construct a 230 kV transmission line from Burlington to Lamar. Voltage: 230 kV Length: 107 miles Type: Line Status: Continuing Planned 2020 ISD: Purpose: Member network service, load-serving, reliability. Tri-State December 2013 Board Meeting 33
Burlington – Wray 230 kV Line Tri-State December 2013 Board Meeting 34
Burlington – Wray 230 kV Line Description: Construct new 230 kV line from the existing Burlington Substation to the existing Wray Substation Voltage: 230 kV Length: 72 miles Type: Line Status: Under Construction Planned 2016 ISD: Purpose: Improve load-serving capability, remove generation operating restrictions and support renewable resource development in eastern Colorado. Tri-State December 2013 Board Meeting 35
Falcon – Midway 115 kV Line Uprate Project Tri-State December 2013 Board Meeting 36
Falcon – Midway 115 kV Line Uprate Project Description: Planned uprate of existing 115 kV line between Falcon and Midway Voltage: 115 kV Length: 27miles Type: Distribution Status: Planned Planned 2017 ISD: Purpose: Increase conductor thermal rating Tri-State December 2013 Board Meeting 37
38 Keota 345:115 kV Tri-State December 2013 Board Meeting
Keota 345:115 kV • Function: • Serve increasing High West Energy and Morgan County Rural Electric Association loads (Oil and Gas). • Description: • Sectionalize the existing LRS – Story 345 kV line. • Construct 345/115 kV substation (2 x 225 MVA transformers) • Construct a double circuit 115 kV line to two load serving substations: Redbox and Redtail. • Planned ISD: • Keota substation: Complete. • Keota – Redbox – Redtail 115 kV: 2015/2016. 8 mile, double • Regulatory Status: circuit 115 kV • CPCN Granted. 16-18 mile, double circuit 115 kV 0.5 mile, single circuit 115 kV Tri-State December 2013 Board Meeting 39
Keota 345:230 kV (a.k.a. Pony Creek) Tri-State December 2013 Board Meeting 40
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