OHM Electrical Contracting is your full service electrical contracting company in Seattle.

Our core passion is renewable energy. We offer a full complement of electrical services from small residential jobs to large scale industrial projects.

Paul Sim, OHM’s owner and founder, is an 01-Certified Master Electrician, SIM**AAP857K8.

When you hire OHM you are supporting a more diverse and equitable business landscape.

  • OHM Electrical Contracting is certified by the Washington State Office of Minority and Women’s Business Enterprises (OMWBE). OHM is a certified Minority Business Enterprise.
  • OHM is also DBE, or Disadvantaged Business Enterprise, Certified.
  • OHM is registered with the Tulalip Tribes Native American Owned Business (NAOB) Registry. OHM’s TERO Certification Number is #1512.
  • OHM is proud to be featured on Intentionalist, an online guide to intentional spending that supports small businesses and diverse local communities.
Hire OHM Today!
OHM is TERO Certified

Meet Our Team

Alfred Paul Sim

Owner & Founder of OHM Electrical Contracting

“I come from a family of electricians, engineers and consultants. I have experience in all areas of electrical construction, electrical business management and electrical engineering. As a licensed 01-Master Electrician, there is not an electrical system that I haven’t installed, designed or troubleshot. I was a foreman and Project Manager for 30 electricians on a high-end mixed-use building consisting of a hotel, apartments and retail space. I have installed utility-scale photo-voltaic systems, as well as tiny house battery back-up systems. I enjoy troubleshooting complex electrical systems.

Growing up half Native American, I have a profound duty for a better environment and quality of life through technology that works in harmony with nature. Quality, renewable energy, efficient electrical energy design and electrical safety are extremely important to me.

In my spare time I enjoy chess, rock climbing, Go, amateur mycology and tinkering with Arduinos and Rasberry Pi systems.”

Peter Vretros

Senior Solar Project Manager

“Originally from the east coast with a background in historical property renovation and restoration, I’ve been in the Pacific North West for 6 years. I’ve worked in the renewable energy industry for the past 9 years. In this time I’ve had experience in everything from small-scale battery back-up residential systems to utility-scale solar installs. Whether it is roof-mounted residential systems or large ground-mounted systems, renewable energy is a passion of mine.

Ian K.

Operations Manager

“I’ve worked in Project Management and Client Services for over a decade and am excited to help OHM meet Seattle’s electrical needs, as well as our continued focus on renewable energy systems. I’ve lived in Seattle for almost two decades after moving here from Alaska, graduated from UW with a degree in Psychology, as well as a certification in Project Management from NSCC.”

Chris Holbrook


“I’m an apprentice at OHM Electrical Contracting and am constantly learning new areas of the trade. Every day brings something different to learn and problem solve. I grew up in the Pacific Northwest and moved away after high school to begin my electrical career in Virginia. Now that I’m back in the Seattle area, I am grateful for all that it has to offer. Washington is beautiful and I feel lucky to be here. In the short amount of time that I’ve been with OHM , I’ve already gained much more experience than I would have imagined. I’m looking forward to my future with this company.”

Justin Yun


Justin is our newest apprentice here at OHM. We’re happy to have him on the team!