H2 PowerTech provides reformer, hydrogen production, and fuel cell technology along with product research and development services. This is based on a portfolio of technology developed over 17 years with over $200 million invested, resulting in over 200 patents to date.

Harrison Electrical is one of the biggest electrical contractors in the UK. They provide a wide range of services for both the industrial and the commercial sectors. They work from start to finish like an initial consultation, initial design, installation, and testing, final fittings. This company can work on any kind of electrical requirement of the contractors.

Hatz is a pioneer in 1 to 4-cylinder diesel engines, serving industries such as construction, agriculture, marine, and military. It also develops specialized power systems and high-precision components for various sectors.

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.

A specialist in hydrogen technologies, HDF develops, finances, builds, and operates multimegawatt industrial power generation infrastructures. HDF marketed the Renewstable® power plants, which capture intermittent renewable energy and store it massively in the form of hydrogen to produce stable, 24-hour electricity that can be controlled like a thermal power plant at a competitive price.

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.

Heason provides specialist motion engineering consultancy, design, and manufacturing services across a diverse range of market sectors including aerospace, defense, printing, packaging, medical, lab automation, autosport, automotive, transportation, renewable energy, science, and factory automation.

Heliox provides world-class smart energy management solutions that are tailored and scalable within a fast-changing e-mobility landscape. Heliox working toward a sustainable world where a seamless charging experience is the standard for every electric vehicle, and this transforms the way power every day.

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.

For more than 20 years, Hexacta has successfully delivered high-quality software development, IT consulting, UI/UX design, and data engineering and analytics services. Hexacta’s customer centricity and expertise across all phases of the software engineering lifecycle have resulted in a highly satisfied client base of globally renowned brands.

Himalayan Power Machine Manufacturing Co. (HPM) is a prominent Indian manufacturer specializing in portable power solutions. Established in 1995 and headquartered in Dehradun, Uttarakhand, HPM offers a diverse range of products including petrol, diesel, LPG, and kerosene generators, as well as welding machines, concrete vibrators, agricultural machinery, and solar and hybrid generators.

Hind Rectifiers Ltd. has long-standing tradition and experience in developing, designing, manufacturing and marketing Power Semiconductor, Power Electronic Equipment and Railway Transportation Equipment.

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.

Hoeller Electrolyzer was founded to develop, manufacture, and sell PEM-electrolysis-stacks which are needed by OEMs of systems that produce "green hydrogen"​, i.e. for storing regenerative energy in the form of hydrogen.

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.

Established in Taiwan in 1974, Hon Hai Technology Group (Foxconn) is the world’s largest electronics manufacturer. Foxconn is also the leading technological solution provider, and it continuously leverages its expertise in software and hardware to integrate its unique manufacturing systems with emerging technologies.

Honeywell is a Fortune 100 company that invents and manufactures technologies to address tough challenges linked to global macrotrends such as safety, security, and energy. With approximately 110,000 employees worldwide, including more than 19,000 engineers and scientists, it has an unrelenting focus on quality, delivery, value, and technology in everything it makes and does.

For more than one hundred years, Hooper Corporation has been full-service electric, power and mechanical contractor. They are proud of what they have built and those they have partnered with.

The purpose of the Sustainable Energy and Environment Coalition is to advance policies that promote clean energy innovation and domestic manufacturing, develop renewable energy resources, and create family-sustaining clean jobs throughout the product supply chain.

Housing Solutions provide good quality, affordable homes to rent and buy across the South East of England. They own, manage and maintain more than 7,500 homes, across seven local authorities in and around the Maidenhead area. They offer a wide range of housing options, including affordable homes to rent, properties to buy under shared ownership, market rent properties and specialist accommodation for older people and people who need care.

Howe Electric began as a small electrical contracting business in 1949 in Fresno, California. It was incorporated ten years later as Howe Electric, Inc. They provide Electrical Engineering (Design), Electrical Engineering (Design-Build), BIM Solutions (Building Information Modeling), Design-Build Construction, Value Engineering, Construction Management, Net Zero Energy, Electrical Engineering and much more.

Hub Energy are an experienced, award winning, Yorkshire-based Solar PV and energy efficiency provider. Their projects cover domestic, commercial sector and large-scale investment projects from concept through to installation and aftercare. Hub Energy have a proven track record designing and installing Solar PV systems and have excellent customer satisfaction because of our customer first approach.

Huston Electric, Inc. is a privately owned, fourth-generation, full-service electrical contracting company with divisions specializing in design-build and service work. Huston Electric, Inc. has three locations, Kokomo, Westfield and Lafayette, IN, to better serve our customers. Huston Electric, has three other Divisions, Huston Sign & Services, Huston Technologies and Huston Generator and Compressors.

Hydrogen Optimized is a Hydrogen Technology focused project company. They develop and implement projects for clients and partners using their innovative hydrogen capabilities. They work with clients and partners to move projects forward through conceptualization, commercialization and scaling in the market.

Hyundai Corporation provides customers with products and services under the optimum condition required by customers by developing various heavy chemical industrial products such as ships, machines, plants, automobiles, steel, metal, chemicals, electric and electronic products.

i-DE Redes Eléctricas Inteligentes SAU is located in Bilbao, Spain and is part of the Electric Power Generation, Transmission and Distribution Industry. They company has 3,378 employees at this location and generates US$ 2.29 billion in sales on average per year.

Iberdrola is a global energy leader and the number one producer of wind power, and one of the world's biggest electricity utilities, in terms of market capitalization. They have brought the energy transition forward two decades to combat climate change and provide a clean, reliable and smart business model.

With more than 180 years of history, Iberdrola SA is currently a global energy leader, a major wind power producer and one of the largest electricity companies in the world in terms of stock market capitalization. They have been committed to clean energy for more than 20 years with the objective of exceeding 52,000 MW of renewable capacity by 2025.

iChoosr is the owner of Solar Together and a group-buying specialist in this field, who cooperates with participating local authorities to deliver the scheme. Solar Together is a unique group-buying scheme for solar photovoltaic (PV) panels and battery storage. This scheme will make solar PV and batteries more accessible and more affordable for a great number of people.

Boise, Idaho-based IDACORP is a holding company comprised of Idaho Power Company, a regulated electric utility; IDACORP Financial, a holder of affordable housing projects and other real estate investments; and Ida-West Energy, an operator of small hydroelectric generation projects that satisfy the requirements of the Public Utility Regulatory Policies Act of 1978.