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THE TRES AMIGASUNITING THE NATION’S ELECTRIC POWER GRID

THE TRES AMIGAS SUPERSTATION

EPRI   HVDC‐FACTSPalo Alto, Ca  ‐ August 31, 2011

The Location

Tres Amigas Is Ideally Situated in Eastern New Mexico Near the Borders of CO, OK and TX Serving as a Three‐Way Interconnection of 

WECC Eastern and ERCOT

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WECC, Eastern and ERCOT

From the 2010 Transmission Summit in Sweetwater

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w/ HVDC Proposals

Tres Amigas Conceptual

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Conceptual 750 MW Back to Back VSC

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Conceptual 750 MW “Folded” VSC

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“Folded Design” VSC

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Potential Footprint

88

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Project Area

1010

For the Interconnects

Plan for Tres Amigas !

• Look at Potential Reliability Benefitsy– Power oscillation dampening– Direct voltage control– Real time power flow solutions via active and reactive measuresReal time power flow solutions via active and reactive measures

• Consider the Value of Emergency Support– Black start capabilitiesp– Facilitation of sharing of spinning reserve – Emergency imports/exports

• Do your Economic Analysis– Increase of power transfers and line capacity– Capability to implement targeted solutions

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p y p g– Dynamic Voltage Support reduces line losses

Recent developments

FERC Approved Tres Amigas’ Application For Market‐Based Rates

• Tres Amigas was granted authority by FERC to sell transmission services through the superstation at rates determined by market forcesforces.

• Obtaining this authority was essential because Tres Amigas does not have captive customers to whom it can assign the cost of its p gfacility.

• Tres Amigas will now hold an open season auction to sell i i i h i d b d h i bidtransmission rights to interested customers based on their bids.

• Tres Amigas was also granted the right to negotiate bilateral contracts with anchor customers in lieu of selling transmission

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contracts with anchor customers in lieu of selling transmission services at auction.   

Key Physical Milestones

• Select  General Contractor September 2011

• Select Construction Manager September 2011

• Interconnection Agreements Studies 2Q2011• Interconnection Agreements Studies – 2Q2011

• Interconnection Agreements Approved – 3Q2011

• Construction Financing complete – 3Q‐2011

• Ground breaking 3Q2011

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Key Commercial Milestones

• Anchor Tenant Relationship(s)

• File Anchor Tenant with FERC• File Anchor Tenant with FERC

• Balancing Authority Approval

• Develop Open Access Transmission Tariff (OATT) filing with FERCwith FERC 

• Define and file Ancillary Tariff with FERC

• Auction remaining Transmission Capacity

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Tres Amigas SuperStation….Uniting the Electric Grid

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