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Capstone Green Energy Corporation develops, manufactures, markets, and services microturbine technology solutions for use in stationary distributed power generation and distribution networks applications worldwide. It offers microturbines, components, and accessories for various applications, including cogeneration combined heat and power (CHP), integrated CHP, and combined cooling, heat, and power, as well as renewable energy, natural resources, and critical power supply. The company's microturbines are also used as battery charging generators for use in hybrid electric vehicles. It also provides various accessories, including rotary gas compressors with digital controls; integrated heat recovery modules for CHP applications; dual mode controllers that allow automatic transition between grid connect and stand-alone modes; batteries with digital controls for stand-alone or dual-mode operations; power servers for multipacked installations; protocol converters for Internet access; packaging options; and miscellaneous parts, such as frames, exhaust ducting, backflow dampers, and installation hardware. In addition, the company offers rental solutions and aftermarket spare parts. Further, it provides energy conversion products including hybrid energy stations, baker hughes, and industrial gas turbines; hydrogen energy solutions, such as hydrogen-based combined heat and power products; and energy storage products comprising microgrid storage systems and lithium-ion battery energy storage systems. The company markets and sells its products primarily through distributors and original equipment manufacturers. The company was formerly known as Capstone Turbine Corporation and changed its name to Capstone Green Energy Corporation in April 2021. Capstone Green Energy Corporation was founded in 1988 and is headquartered in Van Nuys, California. On September 28, 2023, Capstone Green Energy Corporation, along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the U.S. Bankruptcy Court for the District of Delaware.

CN Energy Group. Inc., through its subsidiaries, engages in the manufacture and supply of wood-based activated carbon primarily in China. The company's activated carbon is used in pharmaceutical manufacturing, industrial manufacturing, water purification, environmental protection, and food and beverage production. It also engages in the generation and supply of biomass electricity; production of steam for heating; sale of minerals, stone, metal materials, construction materials, wood, chemical materials and products, rubber products, and paper products; management and conversion of forest and natural ecosystem; and forest acquisition, rights transfer, and nurturing, and timber harvesting and processing activities. The company was incorporated in 2018 and is based in Lishui, China.

Pineapple Energy Inc. engages in the sale, design, and installation of photovoltaic solar energy systems and battery storage systems in the United States. Its brand portfolio includes SUNation, Hawaii Energy Connection, E-Gear, Sungevity, and Horizon Solar Power. The company develops and manufactures energy management software and hardware, such as energy management control devices on solar systems that are paired with batteries. It primarily serves residential homeowners, as well as commercial owners, other municipal customers, energy services companies, and other utilities. Pineapple Energy Inc. was founded in 1969 and is based in Minnetonka, Minnesota.

Unit Corporation, together with its subsidiaries, engages in the exploration, acquisition, development, and production of oil and natural gas properties in the United States. It operates through three segments: Oil and Natural Gas, Contract Drilling, and Mid-Stream. The Oil and Natural Gas segment explores for, acquires, develops, and produces oil and natural gas properties. Its producing oil and natural gas properties, unproved properties, and related assets are primarily located in Oklahoma and Texas, as well as in Arkansas, Colorado, Kansas, Louisiana, Montana, New Mexico, North Dakota, Utah, and Wyoming. The Contract Drilling segment is involved in the contract drilling of onshore oil and natural gas wells for a range of other oil and natural gas companies primarily in Oklahoma, Texas, Wyoming, North Dakota, Colorado, and Utah. It has 55 drilling rigs in its fleet. The Mid-Stream segment buys, sells, gathers, processes, and treats natural gas for third parties. This segment operates 3 natural gas treatment plants, 14 processing plants, 22 gathering systems, and approximately 1,475 miles of pipeline in Oklahoma, Texas, Kansas, Pennsylvania, and West Virginia. Unit Corporation was founded in 1963 and is headquartered in Tulsa, Oklahoma.