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.

Alfred Sim, OHM’s owner and founder, is an 01-Certified Master Electrician, SIM**AAP857K8, as well as an Electrical Contractor, License #OHMELC836B3. OHM is approved for residential, commercial and industrial electrical work.

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 proud to be featured on Intentionalist, an online guide to intentional spending that supports small businesses and diverse local communities.
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Meet Our Team

Alfred P. 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.

 Alexandr Pomortsev


“I was an electrician for ten years in Kazakhstan and after moving to the US am pursuing my journeyman license here. I am excited to join the OHM team and look forward to many successful projects..”

Justin Yun


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