ALLETE, Inc. operates as an energy company. The company operates through Regulated Operations, ALLETE Clean Energy, and Corporate and Other segments. It generates electricity from coal-fired, biomass co-fired / natural gas, hydroelectric, wind, and solar. In addition, the company provides regulated utility electric services in northwestern Wisconsin to approximately 15,000 electric customers, 13,000 natural gas customers, and 10,000 water customers, as well as regulated utility electric services in northeastern Minnesota to approximately 150,000 retail customers and 14 non-affiliated municipal customers. Further, it owns and maintains electric transmission assets in Wisconsin, Michigan, Minnesota, and Illinois. Additionally, the company focuses on developing, acquiring, and operating clean and renewable energy projects; and owns and operates approximately 1,200 megawatts of wind energy generation facility, as well as involved in the coal mining operations in North Dakota; and real estate investment activities in Florida. It owns and operates 162 substations with a total capacity of 9,980 megavolt amperes. The company serves taconite mining, paper, pulp and secondary wood products, pipeline, and other industries. The company was formerly known as Minnesota Power, Inc. and changed its name to ALLETE, Inc. in May 2001. ALLETE, Inc. was incorporated in 1906 and is headquartered in Duluth, Minnesota.

Ameresco, Inc., a clean technology integrator, provides a portfolio of energy efficiency and renewable energy supply solutions in the United States, Canada, Europe, and internationally. It operates through U.S. Regions, U.S. Federal, Canada, Europe, Alternative Fuels, and All Other segments. The company offers energy efficiency, infrastructure upgrades, energy security and resilience, asset sustainability, and renewable energy solutions for businesses and organizations. It designs, develops, engineers, and installs projects that reduce the energy, as well as operations and maintenance (O&M) costs of its customers' facilities; and projects primarily include various measures customized for the facility and designed to enhance the efficiency of building systems, such as heating, ventilation, cooling, and lighting systems. In addition, the company offers renewable energy solutions and services, such as the construction of small-scale plants that the company owns or develops for customers that produce electricity, gas, heat, or cooling from renewable sources of energy and O&M services; and electricity, processed renewable gas fuel, and heat or cooling produced from renewable sources of energy. Further, the company sells photovoltaic (PV) solar energy products and systems, as well as provides consulting, and enterprise energy management services; and operates wind farms. It serves the federal, state, local governments, healthcare and educational institutions, airports, public housing authorities and public universities, municipal utilities, and commercial and industrial customers. As of December 31, 2023, the company owned and operated 185 small-scale renewable energy plants and solar PV installations. Ameresco, Inc. was incorporated in 2000 and is headquartered in Framingham, Massachusetts.

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.

Emeren Group Ltd, together with its subsidiaries, develops, builds, and sells solar power projects. It owns and operates 3-gigawatt pipeline of projects and independent power producer assets, as well as a 10-gigawatt pipeline of storage pipeline. The company develops community solar gardens; and sells project rights. In addition, it engages in engineering design; procurement of solar modules; balance-of-system components and other components; and construction contracting and management services. Further, the company generates and sells electricity. It operates in China, the United States, the United Kingdom, Germany, France, Poland, Italy, and Hungary. The company was formerly known as ReneSola Ltd and changed its name to Emeren Group Ltd in January 2023. Emeren Group Ltd was founded in 2005 and is headquartered in Norwalk, Connecticut.

SolarBank Corporation operates as an independent renewable and clean energy project developer, power producer, and asset operator in Canada and the United States. It focuses on solar photovoltaic power generation projects, battery energy storage systems, and EV-charging projects. The company provides expertise in the areas of site origination, utility grid interconnection, permitting, financing, engineering, procurement and construction, operation and maintenance, and asset management of solar photovoltaic power plants to the renewable and clean energy industry. It also develops solar projects that sells electricity to commercial, industrial, municipal, residential, and utility off-takers sectors. The company was formerly known as Abundant Solar Energy Inc. and changed its name to SolarBank Corporation in October 2022. SolarBank Corporation was incorporated in 2013 and is headquartered in Toronto, Canada.

Sunnova Energy International Inc. engages in the provision of energy as a service in the United States. The company offers electricity, as well as offers operations and maintenance, monitoring, repairs and replacements, equipment upgrades, on-site power optimization, and solar energy system and energy storage system diagnostics services. As of December 31, 2023, it operated a fleet of residential solar energy systems with a generation capacity of approximately 2,292 megawatts serving over 419,000 customers. The company was incorporated in 2012 and is headquartered in Houston, Texas.

Alternus Energy Group Plc operates as an international vertically integrated independent power producer. It owns, develops, installs, and operates midsized utility scale solar parks. The company was incorporated in 2019 and is headquartered in Dublin, Ireland.

SunPower Corporation, a solar technology and energy services provider, offers solar, storage, and home energy solutions primarily in the United States and Canada. Its solutions include the Equinox and SunVault systems which are pre-engineered modular solutions for residential applications that combine solar module technology with integrated plug-and-play power stations, cable management systems, and mounting hardware that enable dealers and installers to complete system installations, as well as for end customers to manage their energy production. The company also provides post-installation monitoring and maintenance services. It serves residential customers, including individual homeowners and new home builders. The company was incorporated in 1985 and is headquartered in Richmond, California. SunPower Corporation operates as a subsidiary of TotalEnergies SE.