2020 Colorado 10-Year Transmission Plan (PDF)
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10-YEAR TRANSMISSION PLAN For the State of Colorado To comply with Rule 3627 of the Colorado Public Utilities Commission Rules Regulating Electric Utilities February 3, 2020 Table of Contents I. Executive Summary .............................................................................................................. 1 II. Transmission Planning in Colorado .................................................................................... 11 A. Coordinated Planning ................................................................................................. 11 B. Public Policy Issues ..................................................................................................... 15 C. Emerging Issues .......................................................................................................... 26 III. Company Plan Narratives ................................................................................................... 29 A. Black Hills 10-Year Plan Overview ........................................................................... 29 1. Black Hills Service Territory ............................................................................... 29 2. Black Hills Projects .............................................................................................. 32 B. Tri-State 10-Year Plan Overview ............................................................................. 40 1. Tri-State Planning Process ................................................................................. 40 2. Tri-State Projects ................................................................................................. 43 C. Public Service 10-Year Plan Overview .................................................................... 50 1. Public Service Planning Process ........................................................................ 51 2. Public Service Projects ........................................................................................ 53 3. Public Service Conceptual Plans ....................................................................... 63 IV. Projects of Other CCPG Transmission Providers ............................................................... 75 V. Senate Bill 07-100 Compliance and Other Public Policy Considerations........................... 77 A. Black Hills Summary ................................................................................................... 80 B. Public Service Summary ............................................................................................ 83 1. Projects That Have Been Completed or Planned ........................................... 84 2. Projects that are Planned or Conceptual ......................................................... 86 VI. Stakeholder Outreach Efforts ........................................................................................ 89 A. Black Hills Outreach Summary ................................................................................. 89 B. Tri-State Outreach Summary ................................................................................... 91 C. Public Service Outreach Summary .......................................................................... 94 D. CCPG Outreach Summary ....................................................................................... 102 CCPG Northeast Colorado Subcommittee Stakeholder Input Process ........... 104 Colorado Energy Plan Task Force .......................................................................... 105 CCPG Lamar Front Range Stakeholder Input Process ....................................... 106 Energy Storage and Non-wires Alternatives Working Group ........................... 111 VII. 10-Year Transmission Plan Compliance Requirements.................................................... 112 A. Efficient Utilization on a Best-Cost Basis: Rule 3627(b)(I) ............................. 112 B. Reliability Criteria: Rule 3627(b)(II) .................................................................... 117 1. Black Hills Reliability Criteria ........................................................................... 118 2. Tri-State Reliability Criteria ............................................................................. 119 3. Public Service Reliability Criteria .................................................................... 120 C. Legal and Regulatory Requirements: Rule 3627(b)(III) .................................. 120 1. Black Hills Legal Requirements ....................................................................... 120 2. Tri-State Legal Requirements ......................................................................... 123 3. Public Service Legal Requirements ................................................................ 124 D. Opportunities for Meaningful Participation: FERC Order No. 890 ................... 124 1. Black Hills Participation Strategy .................................................................... 125 2. Tri-State Participation Strategy ...................................................................... 125 3. Public Service Participation Strategy ............................................................. 125 E. Coordination Among Transmission Providers: FERC Order No. 1000 ............ 125 i VIII. 10-Year Transmission Plan Supporting Documentation ........................................................ 128 A. Methodology, Criteria, & Assumptions .................................................................. 128 1. Facility Ratings (FAC-008-3) ........................................................................... 128 a. Black Hills Ratings ..................................................................................... 128 b. Tri-State Ratings ........................................................................................ 128 c. Public Service Ratings ............................................................................... 129 2. Transmission Base Case Data: Power Flow, Stability, Short Circuit ....... 129 B. Load Modeling ............................................................................................................ 130 1. Forecasts ............................................................................................................. 130 a. Black Hills Forecasts .................................................................................. 130 b. Tri-State Forecasts .................................................................................... 131 c. Public Service Forecasts ........................................................................... 132 2. Demand-Side Management ............................................................................. 133 a. Black Hills DSM ........................................................................................... 133 b. Tri-State DSM ............................................................................................. 134 c. Public Service DSM .................................................................................... 134 C. Generation and Dispatch Assumptions ................................................................. 134 1. Black Hills Assumptions .................................................................................... 135 2. Tri-State Assumptions ...................................................................................... 135 3. Public Service Assumptions ............................................................................. 136 D. Methodologies ............................................................................................................ 137 1. System Operating Limits (FAC-010) .............................................................. 137 a. Black Hills SOL ............................................................................................ 137 b. Tri-State SOL .............................................................................................. 138 c. Public Service SOL ..................................................................................... 138 2. Available Transmission System Capability Methodology (MOD-001)...... 138 a. Black Hills TTC ............................................................................................ 138 b. Tri-State TTC .............................................................................................. 139 c. Public Service TTC ..................................................................................... 140 3. Capacity Benefit Margin (MOD-004) .............................................................. 140 a. Black Hills Capacity Benefit Margin (MOD-004) .................................. 140 b. Tri-State CBM ............................................................................................. 141 c. Public Service CBM .................................................................................... 141 4. Transmission Reliability Margin Calculation Methodology (MOD-008).... 141 a. Black Hills Transmission Reliability Margin (MOD-008) ..................... 141 b. Tri-State TRM .............................................................................................. 142 c. Public Service TRM ..................................................................................... 142 E. Status of Upgrades ................................................................................................... 142 F. Studies and Reports ................................................................................................