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.

Powell Industries, Inc., together with its subsidiaries, designs, develops, manufactures, sells, and services custom-engineered equipment and systems. The company's principal products include integrated power control room substations, custom-engineered modules, electrical houses, medium-voltage circuit breakers, monitoring and control communications systems, motor control centers, switches, and bus duct systems, as well as traditional and arc-resistant distribution switchgears and control gears. Its products have application in voltages ranging from 480 volts to 38,000 volts. The company also provide field service inspection, installation, commissioning, modification and repair, spare parts, retrofit and retrofill components for existing systems, and replacement circuit breakers for switchgear. It serves onshore and offshore production, liquefied natural gas facilities and terminals, pipelines, refineries, and petrochemical plants, as well as electric utility, light rail traction power, mining and metals, pulp and paper, data centers and other municipal, commercial, and industrial markets. The company has operations in the United States, Canada, the Middle East, Africa, Europe, Mexico, and Central and South America. Powell Industries, Inc. was founded in 1947 and is headquartered in Houston, Texas.

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.

Electrovaya Inc. engages in the design, development, manufacture, and sale of lithium-ion batteries, battery management systems, and battery-related products for energy storage, clean electric transportation, and other specialized applications in North America. It offers lithium-ion batteries and systems for materials handling electric vehicles, including forklifts and automated guided vehicles, as well as battery chargers to charge the batteries; electromotive power products for electric trucks, electric buses, and other transportation applications; industrial products for energy storage; and power solutions, such as competencies in building systems for third parties. The company was formerly known as Electrofuel Inc. and changed its name to Electrovaya Inc. in March 2002. Electrovaya Inc. was incorporated in 1996 and is headquartered in Mississauga, Canada.

FuelCell Energy, Inc., together with its subsidiaries, manufactures and sells stationary fuel cell and electrolysis platforms that decarbonize power and produce hydrogen. The company provides various configurations and applications of its platform, including on-site power, utility grid support, and microgrid, as well as distributed hydrogen; solid oxide-based electrolysis; solutions for long duration hydrogen-based energy storage and electrolysis technology; and carbon capture, separation, and utilization systems. It also offers technology to produce electricity, heat, hydrogen, and water. In addition, the company provides turn-key solutions, including development, engineering, procurement, construction, interconnection, and operation services. It serves various markets, including utilities and independent power producers, industrial and process applications, education and health care, data centers and communication, wastewater treatment, government, commercial and hospitality, microgrids, manufacturing, industrial hydrogen, port, oil and gas, wind and solar projects, food and beverage, hydrogen for mobility and material handling, and hydrogen fuel for heat, as well as engineering, procurement, and construction firms. The company primarily operates in the United States, South Korea, and Europe. FuelCell Energy, Inc. was founded in 1969 and is headquartered in Danbury, Connecticut.

Westport Fuel Systems Inc. engages in the engineering, manufacturing, and supplying alternative fuel systems and components for use in transportation applications in Europe, Asia, North America, South America, and internationally. The company operates through two segments, Original Equipment Manufacturers and Independent Aftermarket. It offers alternative fuel systems and components, such as liquefied petroleum gas (LPG), compressed natural gas (CNG), liquefied natural gas (LNG), renewable natural gas or biomethane, and hydrogen; and pressure regulators, injectors, electronic control units, valves and filters, complete bi-fuel, mono-fuel and dual-fuel LPG and natural gas conversion kits and high-pressure hydrogen components. The company provides Westport's LNG high pressure direct injection 2.0 fuel system and bi-fuel products; offers turnkey solutions covering all process phases, including prototyping, development, calibration, validation, homologation, vehicle conversion and logistic services, as well as systems for diesel-powered vehicles; and supplies hydrogen fuel system components for light, medium, and heavy-duty applications. It offers its products under the AFS, BRC, Emer, GFI, HPDI, Stako, Prins, Zavoli, OMVL, TA Gas Technology, Vialle, and Valtek brands. The company was formerly known as Westport Innovations Inc. and changed its name to Westport Fuel Systems Inc. in June 2016. Westport Fuel Systems Inc. was incorporated in 1995 and is headquartered in Vancouver, Canada.

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.

Polar Power, Inc. designs, manufactures, and sells direct current (DC) power generators, renewable energy, and cooling systems in the United States and internationally. The company offers DC base power systems, DC hybrid power systems, DC solar hybrid power systems, and mobile power systems. Its DC power systems are available in diesel, natural gas, LPG/propane, and renewable fuel formats. It serves customers in the telecommunications, military, commercial, industrial, and marine markets. In addition, the company sells its products through a direct sales force, and independent service providers and dealers. The company was formerly known as Polar Products, Inc. and changed its name to Polar Power, Inc. in October 1991. Polar Power, Inc. was incorporated in 1979 and is based in Gardena, California.