VIDEO: SCE, APS to extend agreement on use of transmission line

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Southern California Edison and Arizona Public Service filed at FERC to extend the transmission interconnection agreement for the 500-kV Eldorado-Moenkopi transmission line, with both utilities owning a portion of the line that extends from the Four Corners Power plant to the Eldorado substation in southern Nevada.

The current interconnection agreement for the line is set to expire on July 6, and the utilities’ May 6 petition sought to have the agreement remain in effect unless terminated by either party on three years’ notice. They sought an effective date of July 7, noting that the extended agreement would not change any of the rates or charges outlined in previous agreements.

The original transmission interconnection agreement, accepted by FERC in 1966, outlined the provision of transmission service by APS to SCE for SCE’s portion of the output of the Four Corners coal-fired power plant.

The purpose of the interconnection agreement is to provide the terms and conditions related to the interconnection of APS’ transmission system to SCE’s transmission system through the 500-kV line, the responsibilities for the operation and maintenance of the line and the balancing authority area boundaries for APS and SCE, according to the filing.

APS owns a portion of the line that extends from the Moenkopi switching station near the Four Corners plant, which is on the Navajo Reservation about 15 miles west of Farmington, N.M., to the point of change in ownership of the line. That point of change in ownership is where the conductors cross the border of Arizona and Nevada, with SCE owning the portion of the line from that point to the Eldorado substation, the utilities said.

The interconnection agreement establishes that the SCE-owned portion of the Eldorado—Moenkopi line is in the California ISO AA and the APS-owned portion of the line is in the APS BAA.

The agreement states that the scheduling of energy across the line will be performed in accordance with applicable reliability standards and a related control area operating agreement, and that each utility, at its own expense, will operate and maintain its respective portion of the line in a manner consistent with applicable reliability standards, according to the filing.

The agreement provides that transmission line losses will be the responsibility of each respective party and will be addressed according to each party’s respective policies and procedures.

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Tom Tiernan, senior analyst for TransmissionHub has been covering the energy sector for more than 20 years, with previous work at Platts' newsletters and real-time news service. Most recently, he edited and wrote for Megawatt Daily, covering the power industry, demand response markets and smart grid technologies. Previously, he was a reporter at Electric Utility Week, Inside FERC and other publications, covering natural gas and electricity regulation and policy developments from Washington. After receiving a bachelor's degree from the University of Iowa, he began his career in the early 1990s at Pasha Publications, writing primarily for Gas Daily.  Tom can be reached at tomt@pennwell.com.

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