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PSCo Senate Bill 100 Transmission Plans Update

PSCo Senate Bill 100 Transmission Plans Update. December 11, 2007. Senate Bill 100 Transmission Plan Zone 1. PSCo Transmission Planning has performed system studies for the four energy resource zones identified Zone 1 (Northeast Colorado) Short-term transmission solution

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PSCo Senate Bill 100 Transmission Plans Update

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  1. PSCo Senate Bill 100Transmission Plans Update December 11, 2007

  2. Senate Bill 100 Transmission Plan Zone 1 • PSCo Transmission Planning has performed system studies for the four energy resource zones identified Zone 1 (Northeast Colorado) Short-term transmission solution • Pawnee Region: (A) Short term transmission plan is to add additional simultaneous generation injection capacity • (A) Upgrade the existing 230 kV Pawnee – Quincy - Smoky Hill, and Pawnee – Daniels Park lines to 735 MVA. • Seek approval in the 2008 Capital Budget • Capable of delivering all simultaneous generation resources at Pawnee to Denver metro area loads • Cost: $3.54 million Time Frame: 12 months • No CPCN needed 2

  3. Senate Bill 100 Transmission Plan Zone 1 Zone 1 (Northeast Colorado – cont.) Transmission Project filed for CPCN on October 31, 2007. • (B) Long term transmission plan for a new 345kV switchyard at Pawnee and Smoky Hill and build a new 345kV transmission line between Pawnee and Smoky Hill • Capable of 500 MW generation injection at Pawnee. • Filed Pawnee – Smoky Hill 345kV Transmission Project CPCN on October 31, 2007 • Cost: $120 million Time Frame: 65 months 3

  4. Zone 1:PSCo Proposed Transmission Project Short-term solution: Upgrade to 735 MVA 2008 - $3.54 million New 345 Existing 230 Manchief Pawnee Brush Ft. Lupton Peetz - Logan Pawnee Green Valley Cherokee Smoky Hill Long-term solution: New 345kV circuit 2013 - $120 million Daniels Park

  5. Senate Bill 100 Transmission Plan Zone 1 Zone 1 (Northeast Colorado – cont.) Transmission Plans (not filed for CPCN) Filed Senate Bill 07-100 Designation of Energy Resource Zones and Transmission Planning Report • Keenesburg Region: PSCo received a generation interconnection request (GI-2007-6) for 200 MW additional wind at Cedar Creek • New 46-mile 230kV transmission line from Keenesburg to Cherokee • 2 conductor bundle of 954 Kcmil “Cardinal” rated 800 MVA • String a 3rd circuit using the existing 345kV triple circuit steel structures in the existing ROW for the Ft. St. Vrain to Green Valley 230kV transmission line • Rebuild 16 miles of the existing Ft. Lupton to Pawnee 230kV transmission line to double circuit rated 800 MVA • Convert existing 26-mile 115kV line from Ft. Lupton to Cherokee to double circuit operating the existing circuit at 115kV and the new circuit at 230kV. • Cost: $37.50 million Time frame: 54 months

  6. Cedar Creek Expansion 200 MW Ault Generation Lines Existing New Ft. St. Vrain Peetz Logan Pawnee Keenesburg RMEC Niwot Leggett Green Valley Ft. Lupton Valmont Spruce / BSEC Lookout Smoky Hill Quincy Cherokee Waterton Daniels Park Senate Bill 100 Transmission Plan Zone 1 Zone 1 (Northeast Colorado – cont.) • Keenesburg Region:

  7. Senate Bill 100 Transmission Plan Zone 1 Zone 1 (Northeast Colorado – cont.) • Ault Region: Plan for generation up to 600 MW to be interconnected at Ault substation. PSCo received an interconnection request (GI-2007-4) in Northern Colorado that would serve customers in metro Denver. • New 85-mile 230kV transmission line from Ault to Cherokee • 2 conductor bundle of 954 Kcmil “Cardinal” rated 800 MVA • Single 59-mile circuit from Ault to outside Ft. Lupton • Convert existing 26-mile 115kV line from Ft. Lupton to Cherokee to double circuit operating the existing circuit at 115kV and the new circuit at 230kV. • Cost: $69.57 million Time frame: 60 months

  8. Senate Bill 100 Transmission Plan Zone 1 Zone 1 (Northeast Colorado – cont.) • Ault Region:

  9. Transmission Plan: Zones 1 and 3 LRS Sidney Rawhide Ridge Crest Cedar Creek Spring Cnyn Ault Region Timberline Peetz Ault Peetz-Logan Keenesburg Keenesburg Region Windsor Weld RMEC N. Yuma Pawnee Region Story Ft. St.Vrain Zone 1 Pawnee Green Vly Leggett TCTI Ft. Lupton Valmont BSEC Spruce Plains End Quincy Brighton Lookout Barr Lake Cherokee Smoky Hill Arapahoe Den Term Leets Uprate to 735 MVA in 2008 Daniels Park Waterton Filed Pawnee – Smoky Hill 345kV transmission project Fuller Nixon Front Range Uprate Boone – Lamar 230 kV line From 478 MVA to 620 MVA Midway Boone Fountain Valley New Transmission Lamar Zone 3 Comanche Uprate existing line 9

  10. Senate Bill 100 Transmission Plan Zones 2 & 3 Zone 2 (East Central Colorado) • Evaluate and incorporate the transmission study of the planned Eastern Plains Transmission Project (EPTP). Discuss status of project with Tri-State and WAPA. Possibility of a partnership with TSG&T and Western Area Power Administration. • PSCo is actively working with Tri-State in partnering on the EPTP. PSCo and Tri-State have executed an MOU providing the commitment for joint planning and ultimately the ability to co-own new transmission facilities. 10

  11. Senate Bill 100 Transmission Plan Zones 3 Zone 3 (Southeast Colorado) • Lamar Region: Transmission Plan to add addition ATC to relieve the current constraint from the South East area though Boone and into Denver Metro area. • Short-term: • Boone/Lamar Substation: (1) upgrade terminations at Boone and Lamar to increase line rating from 478 to 620 MW (2) Joint transmission line with TSG&T (PSCo ownership is 56%) (3) The estimate for the Lamar and Boone terminations to allow 620 MVA, but the operational limit is 300 MVA, is about $900,000. Boone is a joint substation with TSG&T. This project was discussed with TSG&T on July 25th. They are evaluating their participation. Potential in service date of 2008. • Radial transmission system – loss of Lamar – Boone 230kV line requires all wind generation to be curtailed until line can be restored. 11

  12. Senate Bill 100 Transmission Plan Zone 4 Zone 3 (Southeast Colorado cont’d) • Long-term: • EPTP – anticipate partnership with WAPA and TSG&T • Lamar Substation: (1) To gain access to wind resources in Baca County PSCo will need approximately 57 miles of new 230 kV transmission into area south of Lamar (2) The estimate for a new line and switching station is $27 million. Next phase after implementation of EPTP. Zone 4 (San Luis Valley - Colorado) • Evaluate current system capacity of injection of resources at San Luis Valley (SLV) substation with the existing Transmission System • Preliminary Studies show that generation at the SLV Substation could be: • 175 MW for light load conditions (night, no irrigation load) 12

  13. Senate Bill 100 Transmission Plan Zone 4 Zone 4 (San Luis Valley – Colorado cont’d) • 200 MW for peak summer conditions (mid-afternoon, July , high irrigation loads) • SLV substation is a joint substation with TSG&T. An additional 230 kV terminal at SLV sub station was discussed with TSG&T on July 25th. They are proceeding with evaluating design and will provide an estimate. Preliminary estimate is $1 million. 13

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