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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.

Highpower International, Inc., together with its subsidiaries, produces and sells nickel-metal hydride (Ni-MH) rechargeable batteries. The company operates in three segments: Lithium Business, Ni-MH Batteries and Accessories, and New Material. It offers Ni-MH rechargeable batteries in AA, AAA, 9V, C, D, and SC sizes in blister packing, as well as chargers and battery packs. The company also provides lithium-ion cylindrical and polymer rechargeable batteries, and power source solutions. In addition, it is involved in the research, design, production, and sale of battery packs and systems, and lithium batteries. The company's products are used in various applications, such as electric toys, power tools, portable computers and other electronics, medical devices, and other consumer products. It serves in Mainland China, Asia, Europe, North America, South America, Africa, and internationally. The company was formerly known as Hong Kong Highpower Technology, Inc. and changed its name to Highpower International, Inc. in October 2010. Highpower International, Inc. was founded in 2001 and is headquartered in Shenzhen, the People's Republic of China.

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 a network of 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.