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CARLSBAD, N.M. (AP) — More than 30 miles of transmission lines and several electrical substations will be upgraded as part of eight infrastructure projects being planned by Xcel Energy.

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The company announced Thursday that the $40 million investment is part of a push to strengthen the grid along the Texas-New Mexico border.

The projects are expected to be complete by 2021.

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Overall, Xcel says it has invested in nearly 800 miles of new transmission lines and 10 substations in Texas and New Mexico since 2011. More than 700 miles of additional lines will be built over the next few years.

In New Mexico, crews are currently working on 70 miles of transmission lines and two substations. Texas crews are also building two new substations and putting up 40 miles of lines.

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