Southern Voltage Electric Service
Company Overview
A seasoned electrician with more than 20 years of expertise, he is licensed across three states. He graduated from Milwaukee Area Technical College's apprenticeship program in 1997. He has handled projects from changing light fixtures to wiring entire hospitals. He has been entrusted with electrical projects for notable clients such as the Federal Reserve Bank, Anheuser Busch, Racine Zoo, Barnes Jewish Hospital, Allied Wire and Cable, and countless residences. With his vast knowledge, he can determine the optimal solution for any electrical problem.
Business Services
- Electric inspection
- Electric installation or replacement
- Electric panel installation
- Electric repair
- Light fixture installation
- Light fixture repair
Business Location & Hours
Mon: | Open 24 hours |
Tue: | Open 24 hours |
Wed: | Open 24 hours |
Thu: | Open 24 hours |
Fri: | Open 24 hours |
Sat: | Open 24 hours |
Sun: | Open 24 hours |
Recommended Customer Reviews

As a woman, I deal with repair and service people all the time. What I have never experience with Jim DeVault is any disrespect when it comes to explaining an issue to me. I have had some service people talk down to me. Jim is a master electrician so is very knowledgeable, he arrives on time, gets right to work, and tidies up when done. His wife Miriam schedules the appointments, so you are dealing directly with the owners of the business. Southern Voltage is the only electrical company I use.

Great job! Came out the day I called after hours! Very nice and let me know of the service fee upfront. Will use them again to switch out my old outlets.

Company very responsive & charged a $50 service call fee, but the owner advised that if we decided to have an electric plug installed on our backyard patio, it would be $375, but they would apply the $50 service fee against the $375 fee. We set up an appointment for the following week & the new plug was installed. Unfortunately, they did not give us credit for the $50 service fee as promised. When I called the office & spoke to the owners wife, she was very rude & refused to honor the $50 credit, as her husband previously stated. Know this is their real policy, regardless of what they initially promise.

Fabulous Master Electrician!!
Southern Voltage Electric Service is handsdowns THE best electrician in the Katy area! Jim and Miriam DeVault are the owners of this Katy business. They live in Katy and work here. Jim is a Master Electrician and he really knows so much about electrical issues. He is patient and kind and will explain things to you if you want him to. He will charge you a fair and reasonable amount and you will be pleased with his work. He shows up on time and calls if he is the least bit late. He is professional and very knowledgeable. I trust Jim to do all of my electric work. Give Miriam a call today so you can get on their schedule. They have super amazing customer service. Miriam's number is 832-713-7584. They are great people to know and work with!! I can't say enough good things!

Southern Voltage is a top notch company! They are awesome people that know how to run a business and take care of their customers. They can solve any electrical problem you throw at them.

Jim Devault is knowledgeable and reliable. I trust his opinion, and I do not hesitate to recommend Southern Voltage.

I have been working with a few contractors for the past few months repairing my home after Harvey.
Southern Voltage provided by far the best customer service experience.
Jim (Master Electrician) was not only helpful and delivered the job as promised but answered all of my questions and thought me a few things along the way.
Thank You, and i can say without hesitation Southern Voltage will be contacted for any and all electrical needs in the future.

Great wife and husband duo! They came out a week after the initial call but that's because Harvey had them super busy and our issue wasn't an emergency. It was two outdoor outlets that weren't working and therefore none of our landscape lights were working. He changed out the outlet and that fixed the problem and we are good to go! Their pricing is very fair.

Amazing company! Cannot recommend enough!
I had a couple of switches tripping in my breaker box. Jim came out the same day I called. He was extremely knowledgeable and friendly, breaking down the possibilities for me and where we needed to start.
He came back and replaced a couple of the circuits and we are good as new!
Great prices and awesome service. Will definitely be a returning customer for some additional projects I have planned!
Thank you!!

Easy to set up appointment, arrived at exactly scheduled time, great diagnosis and explanation on the problems, fast repair. I am happy and will use them again for future work