Serving the Power Industry Since 1980
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Electro-Test and

Maintenance, Inc.

P.O. Box 1527

Rapid City, SD


Facility & Equipment

Our Facilities…

ETMI has a 16,000 sq. ft. office shop complex located North of Rapid City, SD in Black Hawk. Our facility is equipped with (2) overhead bridge cranes and fabrication area. We are equipped with a bake-out oven, and a high voltage bay to simulate substation voltages from 2400v to 24,940v. We have 6000 gallons on new transformer fluid in stock along with totes of FR3 fluid.

Since we are a Cooper Power Authorized repair facility we stock over $350,000 of recloser repair parts, and $100,000 of voltage regulator parts for all makes and models.