2011 WAPA Annual Progress Report



Western Area Power Administration

Rocky Mountain Region

2011 Annual Progress Report

Projects:

Ault –Miracle Mile 230-kV Transmission Line

Cheyenne Substation Stage 03

Erie-Hoyt 230-kV Transmission Line

Weld Substation 230-kV Transformer

Ault – Miracle Mile 230-kV Transmission Line

|Name: |Ault-Miracle Mile 230-kV Transmission Line Rebuild |

|Participants: |Western Area Power Administration - Rocky Mountain Region, Tri-State Generation and Transmission |

| |Association |

|Status: |Cheyenne – Miracle Mile 230-kV transmission line is complete, Ault - Cheyenne 230-kV transmission |

| |line energized 3rd Qtr 2010. |

|Description of Work: |Rebuild 146 miles of 115-kV H-frame wood ROW to 230-kV wood H-frame 1272 ACSR and OPGW between |

| |Cheyenne and Miracle Mile substations; Also - rebuild the 35 mile Ault-Cheyenne 115-kV transmission |

| |line with a 230-kV double circuit transmission line on steel single pole with 1272 ACSR conductor and|

| |OPGW, one circuit will be energized at 115-kV |

|Contact: |Linda Pope |

| |Electrical Engineering Technician |

| |5555 E. Crossroads Blvd. |

| |Loveland, Co. 80538 |

| |970-461-7348 |

| |jpope@ |

Cheyenne Substation Stage 03

|Name: |Cheyenne Substation 230-kV Additions |

|Participants: |Western Area Power Administration - Rocky Mountain Region |

|Status: |Energized 2nd Qtr 2010 |

|Description of Work: |Installation of a 115/230-kV 200 MVA transformer and 3-breaker 230-kV ring bus |

|Contact: |Linda Pope |

| |Electrical Engineering Technician |

| |5555 E. Crossroads Blvd. |

| |Loveland, Co. 80538 |

| |970-461-7348 |

| |jpope@ |

Erie-Hoyt 230-kV transmission line

|Name: |Erie – Hoyt 230-kV double circuit transmission line |

|Participants: |Western Area Power Administration - Rocky Mountain Region, Tri-State Generation and Transmission |

|Status: |Beaver-Creek – Hoyt 230-kV transmission line is complete, Erie - Hoyt 230-kV transmission line is |

| |complete. The Story – Henry Lake section is energized at 230-kV; waiting on completion of the Erie |

| |230-kV yard by Tri-State to fully energize at 230-kV |

|Description of Work: |Rebuild existing Erie - Hoyt 115-kV transmission line with 230-kV transmission line double circuit |

| |single pole steel. One circuit will be energized at 115-kV. |

|Contact: |Linda Pope |

| |Electrical Engineering Technician |

| |5555 E. Crossroads Blvd. |

| |Loveland, Co. 80538 |

| |970-461-7348 |

| |jpope@ |

Weld Substation 230-kV Substation

|Name: |Weld Substation 230-kV Additions |

|Participants: |Western Area Power Administration - Rocky Mountain Region, Public Service Company Colorado |

|Status: |Scheduled completion 2nd Qtr 2012 |

|Description of Work: |Addition of a third 230/115-kV 150 MVA transformer |

|Contact: |Linda Pope |

| |Electrical Engineering Technician |

| |5555 E. Crossroads Blvd. |

| |Loveland, Co. 80538 |

| |970-461-7348 |

| |jpope@ |

Western Area Power Administration

Desert Southwest Region

2011 Annual Progress Report

Projects:

Pinnacle Peak Substation

Topock Substation

Pinnacle Peak Substation

|Name: |Pinnacle Peak Substation |

|Participants: |Western Area Power Administration - Desert Southwest Region |

|Status: |Completed November 2010 |

|Description of Work: |Replaced 230/345-kV transformer at Pinnacle Peak |

|Contact: |Chris Lyles |

| |Project Manager |

| |615 South 43rd Avenue |

| |Phoenix, Az. 85009 |

| |602-605-2674 |

| |lyles@ |

Topock Substation

|Name: |Topock Substation |

|Participants: |Western Area Power Desert Southwest Region |

|Status: |Energized October 2010 |

|Description of Work: |Installation of a 230/69-kV 200 MVA transformer |

|Contact: |Lance Weinkamer |

| |Electrical Engineering Technician |

| |615 S. 43rd Avenue |

| |Phoenix, Az. 85009 |

| |602-605-2773 |

| |weinkamer@ |

Western Area Power Administration

Upper Great Plains Region

2011 Annual Progress Report

Projects:

Havre – Rainbow 161-kV Transmission Line

Rainbow Substation Transformer Replacement

Havre Substation

Shelby 2 Substation Reactor Replacement

Fort Peck Hydro Plant Reactor Replacement

New Substation between Malta – Richardson Coulee Transmission Line

Listed below is Western’s 2011 WAUW Annual Progress Report. None of WAUW’s planned transmission system additions/upgrades have any regional impacts to the WECC Interconnected System and none are above the 200-kV or 200 MW reporting thresholds. However, they are significant to the local area and do include future provisions for energization at 230 kV.

1) Updated Progress Report

Havre to Rainbow 161kV Transmission Rebuild / Upgrade Project

(Started Fall 2007, Expected Completion 2017)

Western’s 103 mile Havre – Verona – Rainbow 161kV transmission line was constructed and energized in 1935. It electrically parallels NorthWestern Energy’s (NWE’s) Havre – Rainbow 161kV circuit. These two circuits maintain separate rights-of-ways with two crossings. Western intends to rebuild its circuit in segments, over a 10 year period, at 230-kV specification. Each segment is anticipated to be complete and re-energized within one month. The existing right-of-way is inadequate and will be expanded in most areas and re-routed in others. An Environmental Assessment (EA) is complete for this project and has been issued for final publication. The first 30 mile segment between Havre and Verona is complete, along with 1 mile at the Rainbow / Great Falls end for re-termination into NorthWestern Energy’s (NWE's) Great Falls Substation in conjunction with Project 2) described below. In the fall of 2011, a total of 15 miles will be rerouted and reconstructed in the Loma, MT area. A maximum outage of 1 week is expected in late 2011, during a non-peak period for cut-over and energization of the newly constructed 1 mile and 15 mile sections, along with Project 2) below. Upon completion of each segment, the line will continue to be energized at 161-kV until such time that conversion to 230-kV is required. Additional system impact study analyses will be required with stakeholder approval prior to the 230-kV voltage conversion. No interruption of customer service during construction is anticipated.

2) Updated Progress Report

Rainbow Substation Transformer Replacement & Relocation Project

(Start Spring 2009, Expected Completion Fall 2011)

Western currently owns, operates and maintains a 161/100-kV, 45 MVA auto-transformer and breaker bay in NWE's Rainbow Substation. Western will replace and relocate this transformer with a new three-phase unit away from the Missouri River, reducing this potential environmental hazard. The new 100 MVA unit will be relocated approximately two miles from the existing site in NWE’s 230-kV breaker and one-half Great Falls Substation. The existing 161-kV circuit will be re-terminated at this location late 2011. The Environmental Assessment (EA) for the Havre to Rainbow 161-kV Rebuild / Upgrade (Project 1) above) included the relocation of Western’s Rainbow transformer bank. System studies were performed by both Western and NWE. Agreements with NWE for placement of the transformer in the Great Falls Substation with the new (relocated) 161-kV interconnect are complete. The new 100 MVA transformer has been delivered to the site and is specified with a dual HV winding for energization at 161-kV or 230-kV. Western’s control building and associated protection will be installed and commissioned during the summer of 2011. Upon completion of communications with NWE, Western will make the final cut-over and energization from the Rainbow substation to the Great Falls substation. Western anticipates this may occur as early as August and no later than December 2011. No interruption of customer service during construction is anticipated.

3) Updated Progress Report

Havre Substation Upgrade Project

(Start Fall 2010, Expected Completion 2012)

Western currently owns, operates and maintains the Havre 161/115/12.47-kV Substation. Upgrades are a result of needed relaying replacements and a new 115-kV interconnect for network load. The existing 115-kV single breaker and bypass will be replaced with a ring bus configuration serving the existing Shelby circuit and new network service interconnect. Construction design is complete. The control building and protective relaying will be installed summer of 2011. Completion of the yard work will occur 2012. No interruption of customer service during construction is anticipated.

4) Updated Progress Report

Shelby 2 Substation Reactor Replacement Project

(Start Summer 2010, Expected Completion Fall 2011)

Western currently owns, operates and maintains the Shelby 2 230/115/12.47-kV Substation. The existing 6.5 MVA oil filled reactor has reached its reliable life cycle and is schedule to be replaced. System studies were conducted to size a new unit based on current system operating conditions and topology. A 12 MVA air core unit has been delivered and available for installation. This project was scheduled for 2010 but was postponed due to higher priority projects. It is now scheduled for 2011 installation. No interruption of customer service during construction is anticipated.

5) Updated Progress Report

Fort Peck Hydro Plant Reactor Replacement Project

(Start Spring 2010, Expected Completion Summer 2011)

Western operates and the Corp of Engineers owns and maintains the Fort Peck 13.8/115/161-kV Substation. The existing 15.4 MVA oil filled reactor has reached its reliable life cycle and is schedule to be replaced. The unit is currently being reconditioned with an increased rating of 20 MVA. Delivery is expected Spring 2011 and installation by the Corp of Engineers is scheduled immediately thereafter. No interruption of customer service during construction is anticipated.

6) Updated Progress Report

New 161/115-kV Substation between Richardson Coulee and Malta Substations

(Start Fall 2010, Expected Completion Spring 2013)

Western currently owns, operates and maintains the 180 mile Fort Peck-Richardson Coulee-Malta-Harlem-Havre 161-kV circuit, which is constructed for future 230-kV conversion. A new substation is anticipated to be installed approximately 18 miles East of Malta in the 49 mile section between the Richardson Coulee and Malta Substations. This new substation will provide a 161-kV ring bus constructed at 230-kV specification, 161/115kV transformation and a 115-kV tap for a new 115-kV line that will extend approximately 48 miles to serve an ultimate 22 MW of new oil development network load. VAR support will include approx 15 MVAR shunt capacitance at the new 161-kV substation and a 15 MVAR shunt capacitance at the load. Construction is anticipated to begin in the Fall of 2011 with initial energization and partial load being served Spring of 2013. No interruption of customer service during construction is anticipated.

Western Area Power Administration

Sierra Nevada Region

2011 Annual Progress Report

Project:

O’Banion-Elverta / O’Banion-Natomas 230-kV Transmission Lines

O’Banion-Elverta / O’Banion-Natomas 230 kV Transmission Lines

|Name: |O’Banion-Elverta / O’Banion-Natomas 230 kV Double Circuit Transmission Lines |

| | |

|Participants: |Western Area Power Sierra Nevada Region, Sacramento Municipal Utility District |

|Status: |Double circuit line schedule to be energized in late May of 2011. |

|Description of Work: |Build the 37 miles of O’Banion-Elverta and the 33 miles of O’Banion-Natomas 230 kV double circuit |

| |transmission lines on a steel single pole with vertical double bundled 954 ACSR conductor and OPGW. |

| |Each circuit will be energized at 230-kV |

|Contact: |Kirk Sornborger |

| |Electrical Engineer |

| |114 Parkshore Dr. |

| |Folsom, CA 95630 |

| |916-353-4063 |

| |sornborg@ |

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