Bloom Energy Corporation designs, manufactures, sells, and installs solid-oxide fuel cell systems for on-site power generation in the United States and internationally. The company offers Bloom Energy Server, a solid oxide technology that converts fuel, such as natural gas, biogas, hydrogen, or a blend of these fuels into electricity through an electrochemical process without combustion. It sells its products through direct and indirect sales channels to utilities, data centers, agriculture, retail, hospitals, higher education, biotech, and manufacturing industries. The company was formerly known as Ion America Corp. and changed its name to Bloom Energy Corporation in 2006. Bloom Energy Corporation was incorporated in 2001 and is headquartered in San Jose, California.

Plug Power Inc. develops hydrogen and fuel cell product solutions in North America, Europe, Asia, and internationally. The company offers GenDrive, a hydrogen-fueled proton exchange membrane (PEM) fuel cell system that provides power to material handling electric vehicles; GenSure, a stationary fuel cell solution that offers modular PEM fuel cell power to support the backup and grid-support power requirements of the telecommunications, transportation, and utility sectors; ProGen, a fuel cell stack and engine technology used in mobility and stationary fuel cell systems, and as engines in electric delivery vans; GenFuel, a liquid hydrogen fueling delivery, generation, storage, and dispensing system; GenCare, an ongoing Internet of Things-based maintenance and on-site service program for GenDrive fuel cell systems, GenSure fuel cell systems, GenFuel hydrogen storage and dispensing products, and ProGen fuel cell engines; and GenKey, an integrated turn-key solution for transitioning to fuel cell power. It also provides electrolyzers, a hydrogen generator for clean hydrogen production; liquefaction systems that provides liquid hydrogen to customers; cryogenic equipment for the distribution of liquified hydrogen, oxygen, argon, nitrogen and other cryogenic gases, including trailers and mobile storage equipment; and liquid hydrogen, an alternative fuel to fossil-based energy. The company sells its products through a direct product sales force, original equipment manufacturers, and dealer networks. Plug Power Inc. was incorporated in 1997 and is headquartered in Latham, New York.

Ballard Power Systems Inc. engages in the design, development, manufacture, sale, and service of proton exchange membrane (PEM) fuel cell products. The company offers its products for power product comprising for bus, truck, rail, marine, stationary, and emerging market, such as material handling, off-road, and other applications. It also engages in the delivery of services, including technology solutions, after sales services, and training; and provision of engineering services, product and systems integration services, and related technology transfer for a variety of PEM fuel cell applications. It operates in the United States, Germany, Canada, China, Poland, the United Kingdom, the Netherlands, France, Denmark, Belgium, India, Taiwan, Spain, Norway, Australia, Japan, and internationally. The company has a strategic alliance with Linamar Corporation for the co-development and sale of fuel cell powertrains and components for class 1 and 2 vehicles in North America and Europe. Ballard Power Systems Inc. was founded in 1979 and is headquartered in Burnaby, Canada.

Hyliion Holdings Corp. provides sustainable electricity-producing technology that offers solutions for clean, flexible, and efficient electricity production. The company primarily focuses on developing distributed power generators capable of operating on multiple fuel sources. It primarily targeting the commercial and waste management sectors with deployable generator, as well as focuses on expanding into mobile applications, including vehicles and marine. The company was founded in 2015 and is headquartered in Cedar Park, Texas.

Clean Energy Technologies, Inc. designs, produces, and markets clean energy products and integrated solutions that focuses on energy efficiency and renewable energy in the United States. It operates through four segments: Clean Energy HRS and CETY Europe, CETY Renewables Waste to Energy Solutions, engineering and Manufacturing Business, and CETY HK. The company offers Clean Cycle, which generates electricity by recycling wasted heat produced in manufacturing, waste to energy, and power generation facilities. It also converts waste products created in manufacturing, agriculture, wastewater treatment plants, and other industries to electricity, renewable natural gas, hydrogen, and bio char. In addition, the company offers engineering, consulting, and project management solutions. Further, the company is involved in the sourcing and suppling of liquefied natural gas to industries and municipalities located in the southern part of Sichuan Province and portions of Yunnan Province. The company was formerly known as Probe Manufacturing, Inc. and changed its name to Clean Energy Technologies, Inc. in November 2015. Clean Energy Technologies, Inc. was founded in 1993 and is headquartered in Irvine, California. Clean Energy Technologies, Inc. is a subsidiary of MGW Investment I Ltd.

Fusion Fuel Green PLC, together with its subsidiaries, manufactures and sells miniaturized PEM electrolyzers to produce green hydrogen in Portugal, Spain, and rest of southern Europe. The company offers HEVO-Chain, a centralized PEM electrolyzer; and HEVO-Solar, a grid-independent hydrogen generator. It also provides engineering and procurement services comprising advisory, concept and proposal developments; FEL I, II and III studies; construction and legalization services; and operation and maintenance services. In addition, the company is involved in hydrogen project development. It serves natural gas networks and grids, oil refineries, ammonia producers, regulators, and related government departments. Fusion Fuel Green PLC was founded in 2018 and is based in Dublin, Ireland.

Advent Technologies Holdings, Inc., an advanced materials and technology development company, operates in the fuel cell and hydrogen technology markets in North America, Europe, and Asia. It develops, manufactures, and assembles fuel cell systems and critical components that determine the performance of hydrogen fuel cells and other energy systems. The company offers high-temperature proton exchange membrane (HT-PEM) fuel cells; and electrodes for applications in the fuel cell and energy storage markets, as well as membrane electrode assemblies. It is also involved in the design of fuel cell stacks for stationary power, portable power, automotive, aviation, energy storage and sensor markets. The company is headquartered in Livermore, California.

Hyzon Motors Inc. supplies hydrogen fuel cell systems for decarbonization applications in various industries. The company commercializes its proprietary fuel cell technology through assembling and upfitting heavy duty (HD) hydrogen fuel cell electric vehicles (FCEVs). It also focuses primarily on assembling and converting hydrogen-powered FCEVs; and building and fostering a clean hydrogen supply ecosystem with partners and third parties from feedstock through hydrogen production, dispensing, and financing. In addition, the company's technology focuses on designing and manufacturing of MEAs, BPPs, fuel cell stacks, and fuel cell systems for integration into commercial vehicles. Hyzon Motors Inc. was founded in 2020 and is headquartered in Bolingbrook, Illinois.