Ameren: ATXI begins construction on Zachary substation site, part of Mark Twain project

Ameren (NYSE:AEE) on May 23 said that its wholly owned subsidiary, Ameren Transmission Company of Illinois (ATXI), has begun construction of the $250m, 96-mile, 345-kV Mark Twain Transmission Project, which also involves a substation, to be built in northeast Missouri.

The project is designed to bolster energy reliability for the region, Ameren said.

ATXI, during the week of May 14, broke ground on the site of the Zachary substation adjacent to the existing Adair substation in Adair County, Mo., Ameren said.

Ameren said that ATXI’s contractor, L. Keeley Construction, will later this month begin to build various access points along the transmission corridor from nearby public roadways. Contractors will use those points to access the right of way (ROW) throughout project construction, the company said, adding that once those access points are created, L. Keeley Construction will begin digging and pouring concrete structure foundations.

According to the project’s May newsletter posted on Ameren’s website, the electrical contractor, Sachs Electric, is performing the electrical installation work at the Zachary substation; McGrath & Associates, Inc., is the civil contractor for the substation and is responsible for the substation’s site preparation, concrete work, and equipment layout; and J.F. Electric, an electrical utility contractor, will work on preparing the existing lines for construction and installing the new transmission lines.

The route will run through Adair, Knox, Lewis, Marion and Schuyler counties in Missouri, Ameren said in its statement, noting that almost 100% of the line will be co-located on existing ROWs that include Northeast Missouri Electric Power Cooperative‘s 161-kV line between Palmyra and Kirksville and Ameren Missouri‘s 161-kV line from Kirksville to the Iowa border.

The Missouri Public Service Commission (PSC) in January granted ATXI a certificate of convenience and necessity (CCN) for the project, which will complete a critical link in the region’s energy infrastructure, Ameren said.

The project’s anticipated in-service date is December 2019, the company said.

About Corina Rivera-Linares 2807 Articles
Corina Rivera-Linares, chief editor for TransmissionHub, has covered the U.S. power industry for the past 13 years. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial. She has also covered such topics as health, politics and education for weekly newspapers and national magazines. She can be reached at corinar@pennwell.com.