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SWAT Common Corridor Task Force Update November, 2008.

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Presentation on theme: "SWAT Common Corridor Task Force Update November, 2008."— Presentation transcript:

1 SWAT Common Corridor Task Force Update November, 2008

2 SWAT CC TF Mission Statement: –The Task Force is to establish the principles associated with the determination of the separation distance of linear circuits that are in parallel in the same corridor. Deliverable: –White paper by end of CY 2008: –Audience: Members of the ACC Subject Matter Paper or Compilation of best engineering practices or how to optimize corridor utility –Not intended to be a recipe book or cover all possible scenarios

3 SWAT CC TF Deliverable: continued –White Paper - will address and describe common corridor structure separation issues: System reliability, EMF impacts, land use, aesthetics, potential increase with severance, Federal land issues, cost differences, WEC/NERC/FERC/DOE standards. –BEST PRACTICES or PERMIT-ABILITY of structure separation structure differences and all trade-offs. –Impacts to Reliability and Cost Of placing a line in existing corridor from very close to very far away –2 Conference Calls –1 Meeting, Aug 29th

4 SWAT CC TF Presentations: Greg Bernosky, APS –Identifying New Transmission Line Corridors on Federally Managed Forests in Arizona –Our job is to document the conflict between electric reliability and land management –Forest use – Peak Fire Season Correlates to Peak Electrical demand –Need to work w/USFS to evaluate current corridors and in determination of new corridors –There are not lines drawn on a map but terrain types listed that are more conducive to infrastructure development –Next Speaker…

5 SWAT CC TF Mike Voda, SRP –Cost of Easement –Severance Odd shaped pieces created, difficult to zone w/owners intent Severa nce is subjective, per appraiser, negotiated or determined by jury –Structure Types horizontal, vertical, delta Determination of Easement Widths Insulator swing has influence on width of structure Maintenance has influence on ROW width, live line –Transmission Line Design Minimum Total Cost = Land + Structures + Construction Easement width and structure type = lowest cost? Structural Design

6 SWAT CC TF Tom Wray, Southwestern Power Group –Review of State Transmission Corridor Guidelines –Researched siting laws, regulations and guidelines governing construction of transmission facilities –Researched to identify any guidelines for separation distance for parallel lines in a corridor –AZ, CA, CO, ID, MT, NV, NM, OR and UT –There are no guidelines specifying distance between transmission facilities

7 SWAT CC TF Ron Belval, TEP –System Reliability Impacts Examples drawn depicting potential reliability impacts due to failing into next line Too many lines in one corridor Brian Keel, SRP –FERC/NERC/WECC Standards or Guidelines Applied to Transmission Corridors NERC Standard common tower outage – Cat C

8 SWAT CC TF –SRP continued WECC Standard – Common Corridor Definition –Contiguous right-of-way or two parallel rights-of-way with centerline separation less than the longest span length of the transmission circuits at the point of separation or 500 feet, which ever is greater, between the transmission circuits. This separation requirement does not apply to the last five spans of the transmission circuits entering into a substation. \ Adjacent Transmission Circuit –Transmission circuits within a Common Corridor with no other transmission circuits between them. Transmission Lines that cross but are otherwise on separate corridors are not Adjacent Transmission Circuits. WECC Standards –NERC C.5 with PBRC

9 SWAT CC TF Brian Keel, SRP continued. –PBRC, RPEWG, 7 Step Process of Performance Category Upgrade Request Jaime Wood, EPG –DOE Draft Programmatic Environmental Impact Statement, PEIS –PEIS – evaluates the environmental impacts of broad agency actions, such as development of programs or the setting of national policies.

10 SWAT CC TF J. Wood, continued… –Example, Solar Energy Development PEIS, analyze utility scale solar energy development on BLM administered lands in AZ, CA, CO, NV, NM & UT. –Land Use Plans – set of decisions that establish management direction for the land within BLM admin areas –Land Use Planning Process – is the key tool that the BLM uses to protect resources & designate uses on BLM lands

11 SWAT CC TF –Implement Section 368 of the Energy Policy Act of 2005 –Designates corridors for the preferred location of linear facilities in agency land use and resource management plans on federal lands in 11 Western states Pipelines - oil, gas and hydrogen electrical transmission and distribution lines Schedule prompt action to identify, designate, and incorporate the corridors into the applicable land use plans –Intended to improve coordination among agencies to increase the efficiency of using designated corridors

12 SWAT CC TF –Designating a system of energy corridors would not preclude an applicant from applying for a right-of-way outside of the designated energy corridors –Local and project-specific impacts will be evaluated in the future at the individual project level

13 SWAT CC TF –Section 368 energy corridors


15 Doug Saline, APS –Effect of Separation Distance on EMF –Magnetic Fields –Assumptions: –500kV - ROW width allows for 100 foot from middle of structure –230kV – ROW width allows for 50 foot from middle of structure

16 SWAT CC TF Conference Call items: Meeting Number = * * make sure to enter the * in your entry.


18 –As separation distance increases, the magnetic field distribution across the ROW begins to emulate two independent magnetic field sources. –Overall, the separation distance does not have significant effect on the magnetic field magnitudes (in terms of absolute quantities).

19 SWAT CC TF Ken Bagley –AZ/NM/NV State Land Management Use Criteria Neither AZ or NV in line siting or reliability business, reliability is not a concern in line siting More concerned about maximizing the value of the land Each request to acquire state trust land looked at independently, no clustering NM seemed more amenable to siting on state trust All prefer to use existing linear features

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