Entergy Arkansas completes 69-kV line between Imboden, Black Rock substations

Entergy’s (NYSE:ETR) Entergy Arkansas Inc., (EAI), on March 14 told the Arkansas Public Service Commission (APSC) that it has completed its project involving the 69-kV transmission line connection between the company’s Imboden substation and Arkansas Electric Cooperative Corporation’s (AECC) Black Rock substation.

As TransmissionHub reported, an administrative law judge (ALJ) with the APSC, in a May 25, 2016, order, granted a certificate of convenience and necessity (CCN) to EAI to build, operate and maintain the 69-kV transmission line connection from the 69/34.5-kV Imboden substation to the 161/69-kV Black Rock substation, located in Lawrence County, Ark.

As noted in the ALJ’s order, EAI in March 2016 filed its application for a CCN requesting authority to build, operate and maintain the proposed line, which would be built on lands purchased and owned by EAI, AECC and/or on existing transmission line right of way (ROW).

According to the company’s witness in the proceeding, the proposed project consists of an estimated $1.8m, 0.3-mile line connection from the Imboden substation to the Black Rock substation located near U.S. Route 63, about 4.3 miles south of the community of Imboden, Ark. The witness said that the proposed line is needed to restore the loop capability between the Imboden substation and EAI’s 161-kV Walnut Ridge substation.

The ALJ further noted that according to the witness, the condition of EAI’s 10.9-mile, 69-kV transmission line from EAI’s Water Valley substation to the Imboden substation is such that the Imboden substation cannot be used for backup for any length of time.

The witness said that without a reliable backup from the Imboden substation, a reliable loop capability between the Imboden substation and the Walnut Ridge substation would not exist. The APSC added that according to the witness, the proposed transmission tie from the Imboden substation to the Black Rock substation would eliminate the need for the 69-kV transmission line from the Water Valley substation to the Imboden substation, and would provide a new reliable source to serve area customers.

Upon completion of the project, the existing Imboden to Water Valley 69-kV transmission line would be removed from service.

The witness further noted that the Midcontinent ISO (MISO) approved the proposed project in December 2015, the APSC added.

In an October 2016 order, the APSC said that there being no further action to be taken in the matter, the APSC secretary is authorized to close the docket.

In its March 14 letter to the APSC, EAI said that the project construction and final testing of electrical facilities have been completed, and that the transmission facilities were essentially completed, with substantially all final costs received as of this month.

The line was energized on Jan. 18, the company said, adding that no major deviations in project design were required.

While the estimated final project cost had been about $1.8m, the actual final cost was about $1.3m, the company said, noting that the estimated contingency of $200,000 was not needed, and the estimated ROW damages/restoration cost of $250,000 was not used.

About Corina Rivera-Linares 3286 Articles
Corina Rivera-Linares was TransmissionHub’s chief editor until August 2021, as well as part of the team that established TransmissionHub in 2011. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial from 2005 to 2011. She has also covered such topics as health, politics, and education for weekly newspapers and national magazines.