Harris Electric expanded again in the late 1930s when Vic Sundholm joined the firm. Soon, industrial design and large vessel wiring emerged as two other services for which Harris Electric became known.

Hatzel & Buehler was one of the first electrical construction companies in the US. The firm provides electrical design, construction, engineering, integration, and maintenance services. Projects range from simple service calls to complex, multi-phased design-build projects nationwide.

Since 1999, they have provided a wide range of services for energy and civil infrastructure projects. Their team brings decades of experience in the fields of civil and electrical construction, engineering, project management, and project development & finance. They have extensive expertise in effectively managing a unionized labor force.

Inspired by an enlightened king more than a century ago, Hawaii was an early adopter of electricity to light homes and power industry. The ingenuity in creating and delivering power on these isolated islands is a unique story of innovation, connectivity and progressive thinking that continues today.

Hawkeye Electric is a commercial, residential, and industrial electrical contractor located in Cedar Rapids and Dubuque, Iowa.

Hayward Tyler designs, manufactures and services performance-critical electric motors and pumps for high-pressure, high-temperature applications in the harshest environments across the global energy industry.

At HD Supply, they believe that their core purpose is to improve their associates’ lives and equip them with the tools needed to provide exceptional customer experiences every day. With more than 80 years of experience and one of the largest industrial distributors in North America, they enable their customers’ success by consistently delivering what they need, where and when they need it.

HDBaseT is the global standard for the distribution of ultra-high-definition video & audio, Ethernet, controls, USB and up to 100W of power over a single cable, for up to 100 m/328 ft. HDBaseT eliminates cable clutter without compromising performance or high quality.

Heart Utilities Inc was founded to bring cost effective contracting solutions to the electric industry along the east & gulf coasts. Since inception safety and quality have been placed first above all else. These philosophies have brought a company that in it's infancy was comprised of a mere five employees, a pickup and a boom truck to a thriving electrical contractor.

Hein Electric Supply is Southeast Wisconsin's largest independent electrical wholesale distributor. Since 1946, they have grown from their original branch on 6th & Wells in Downtown Milwaukee, to 9 strategic locations throughout Southeastern Wisconsin including Downtown Milwaukee, Grafton, Menomonee Falls, Oak Creek, Oconomowoc, Pewaukee, Waukesha, West Allis, and West Bend.

Helios Electric delivers tailored solutions to meet their complex needs during all phases of electrical engineering and construction. Utilizing over 30 years of experience in industrial, utility, commercial, and mission-critical systems, they recognize the needs of discerning customers and know what it takes to get the job done right for them.

Helix Electric is an award-winning electrical contractor specializing in design-build and highly complex electrical projects throughout the United States. An established industry leader, Helix Electric has decades of experience and expertise in nearly every field of construction, including mission-critical, data center, medium voltage power distribution, renewable energy, commercial, industrial, mass transit and rail, and high-density residential

Helleniq Energy is one of the pioneering energy groups in South East Europe, with activities spanning across the energy value chain and a presence in six countries. The Group’s main activities include Refining, Supply, and Trading of petroleum and petrochemical products, Fuels Marketing both in Greece and internationally, Renewable Energy Sources, Power Generation & Trading, as well as Supply, Distribution, and Trading of Natural Gas.

Hellman Electric Corporation is one of the metropolitan region's largest heavy construction commercial and industrial electrical contractors. The firm is a member of the International Brotherhood of Electrical Workers, Local Union 3, and is recognized as a pioneer in electrical construction for heavy construction projects.

Hercules Electric Mobility is bringing powerful and scalable recreational electric mobility without range anxiety to power a new generation of electric boats! They have fully integrated solar charging, as part of their modular propulsion technologies for marine and recreational propulsion, scalable up to 1000HP, and bringing the first solid-state battery to the marine mobility market.

Hexagon Energy is an independent energy development firm. We believe that the path to a clean energy future requires a range of new sources and technologies. They develop projects across six diverse energy solutions with one common goal—powering a clean future.

No matter what problem users are having with the plumbing in their Denver home, High 5 Plumbing can help. Whether they need help with the sewer line, drains, water heater, or any other part of the home plumbing system, they are on hand to help the users.

HIGHPOINT ELECTRIC are a commercial and industrial contractor dedicated to providing the best in electric installations, engineering, construction, controls and communications throughout Michigan. Because they are exceptionally well diversified, they can provide clients with total turnkey electrical solutions through their expertise in engineering, construction, controls and communications.

Hill Electric Company are an Industrial Electrical Contractor providing installations of Manufacturing Process and Auxiliary Equipment. Their services include Service Entrance (MV and LV), Power Distribution, and Process Equipment power/control/instrumentation/data.

Hilscher-Clarke Electric Company is a full-service electrical contractor, with more than 100 years of experience in the commercial, industrial, and residential markets

HIPOWER SYSTEMS builds and customizes backup generators, diesel generators, natural gas generators, and alternative bi-fuel generator sets from 8kW to 3MW with a complete range of accessories, including automatic transfer switches, paralleling switchgear, UL tanks, enclosures, and power distribution equipment.

Hirose Electric USA is a subsidiary of Hirose Electric Co., Ltd., one of the world's leaders in developing and manufacturing electric and electronic connectors. Hirose's vigorous international strategy rests on three pillars: strong capital investment, a highly skilled labor force, and close contact with the product development divisions of client manufacturers throughout the world.

Hirschmann is the technology and market leader in industrial networking solutions. Hirschmann offers a complete, integrated structure for data communication throughput that truly protects their investment.

Hitachi commits to helping achieve a sustainable world and people's well-being by utilizing their breadth of digital and green technologies. Since its founding in 1910, Hitachi has responded to the expectations of society and its customers through technology and innovation. They work to apply their expertise in information technology (IT), operational technology (OT), and a wide variety of products to advance social infrastructure systems.

Hitachi Astemo, Ltd. mission is to work on solving various social issues and to create a better future by providing advanced mobility solutions. In addition to reducing traffic accidents and traffic congestion, we aim to reduce the burden on the environment by cleaning exhaust gas and improving fuel efficiency to contribute to the realization of a society that is both people- and eco-friendly.

Hitachi Industrial Equipment creates synergies among Industry related business units and promptly offers one-stop solutions to dynamic market changes along with the diversification in demand that is taking place in the Americas.

Hitachi-Comark is a highly specialized company with more than 50 years of continuous activity and experience in the field of high power RF Technology.

Hitachi Vantara are a globally renowned company in powering global, mission-critical digital and industrial environments. They guide customers from what’s now to what’s next by solving their digital challenges. Services provided include - Enterprise Storage Solutions, Internet of Things, Big Data, Flash Storage, Cloud Infrastructure, Content Mobility, Digital Transformation, and Storage Software Solutions.

HMT Electric Inc. specialize in electrical installations for high-rise construction projects that utilize a cast-in-place concrete design. HMT ELECTRIC INC. was established in February of 2007. After many years of running high-rise divisions for other electrical contractors,

HoloBuilder, Inc. is a San Francisco-based construction technology company that designs, develops, and sells enterprise SaaS software. HoloBuilder offers reality-capturing solutions for progress documentation and construction project management.