extreme underground llc

Our Business Is Boring

The Extreme Underground HDD story begins in Dickinson, ND in 1978. That is when Denny and June Haller founded Denny’s Electric, which remains a family and locally owned electrical contractor to this day. Denny’s Electric began horizontal directional drilling, with a focus on underground gas and electric utility installation, in 2007.

The Boring industry Growth

As demand for directional drilling grew, so too did Denny’s Electric. In 2017 it was decided to establish the boring division as its own independent company. Extreme Underground HDD thus came to be.

Extreme Underground was born from previous success. We look forward to continuing the tradition by investing in the boring industry’s best technology. Our state-of-the-art equipment enables us to bore to each client’s exact specifications. And because our team shares years of experience working in all types of soil and at all types of properties, there’s no project we can’t complete quickly, safely and cost-efficiently.

We stay at the forefront of the boring industry by continually investing in more sophisticated equipment, more accurate drills, and more of the training we need to use both effectively. That ensures we’ll continually deliver the great results that are sought by contractors, engineers and property owners throughout our expansive area of service.

We can Help

Whether you’re burying gas utility lines, electric utility lines, oil gathering lines, gas gathering lines, water mains, sanitary sewer lines, force mains, stormwater lines or fiber optic cable, your best choice for the job is certain. We welcome you to contact us today and explain how we can be of service!

Join Our Team!


Advanced Automation
Advanced Automation



1661 I-94 Business Loop East
Dickinson, ND 58601

extreme underground llc


make a payment

Visit our Payment Portal to make payment to Extreme Underground.

Website by Arvig Media