Ormat Technologies, Inc. engages in the geothermal and recovered energy power business in the United States, Indonesia, Kenya, Turkey, Chile, Guatemala, Guadeloupe, New Zealand, Honduras, and internationally. It operates in three segments: Electricity, Product, and Energy Storage. The Electricity segment develops, builds, owns, and operates geothermal, solar photovoltaic, and recovered energy-based power plants; and sells electricity. The Product segment designs, manufactures, and sells equipment for geothermal and recovered energy-based electricity generation; and provides services relating to the engineering, procurement, construction, operation, and maintenance of geothermal and recovered energy-based power plants. This segment serves contractors; and owners and operators of interstate natural gas pipelines, gas processing plants, and cement plants, as well as companies in other energy-intensive industrial processes. The Energy Storage segment offers battery energy storage systems and related services. Ormat Technologies, Inc. was founded in 1965 and is headquartered in Reno, Nevada.

Energy Recovery, Inc., together with its subsidiaries, designs, manufactures, and sells energy efficiency technology solutions in the Americas, the Middle East, Africa, Asia, and Europe. The company operates through Water and Emerging Technologies segments. The company offers high and low pressure, and ultra pressure exchangers; AT and LPT hydraulic turbochargers; and high-pressure feed and circulation booster pumps for use in seawater and brackish desalination, and wastewater treatment. It also provides PX G1300, which reduces energy consumption and operating costs of carbon dioxide-based refrigeration systems; and spare parts, as well as repair, field, and commissioning services. It sells its products under the ERI, PX, Pressure Exchanger, PX Pressure Exchanger, Ultra PX, PX G, PX G1300, PX PowerTrain, AT, and Aquabold brands to original equipment manufacturers, supermarket chains, cold storage facilities, refrigeration system installers, and other industrial users; aftermarket customers consisting of desalination plant owners and operators; and project developers, end-users, and industry consultants, as well as engineering, procurement, and construction firms. Energy Recovery, Inc. was incorporated in 1992 and is headquartered in San Leandro, California.

Montrose Environmental Group, Inc. operates as an environmental services company in the United States, Canada, and internationally. The company operates in three segments: Assessment, Permitting and Response; Measurement and Analysis; and Remediation and Reuse. The Assessment, Permitting and Response segment provides scientific advisory and consulting services to support environmental assessments; environmental emergency response and recovery; toxicology consulting and environmental audits and permits for current operations; facility upgrades; new projects; decommissioning projects; and development projects. This segment also offers technical advisory and consulting services, including regulatory compliance support and planning, environmental, ecosystem and toxicological assessments, and support during responses to environmental disruptions. The Measurement and Analysis segment tests and analyzes air, water, and soil to determine concentrations of contaminants, as well as the toxicological impact of contaminants on flora, fauna, and human health. Its services include source and ambient air testing and monitoring, leak detection, and advanced analytical laboratory services, such as storm water, wastewater, and drinking water analysis. The Remediation and Reuse segment provides engineering, design, implementation, and operations and maintenance services primarily to treat contaminated water, remove contaminants from soil, or create biogas from waste. The company serves financial, oil and gas, utilities, construction, automotive, real-estate, midstream energy, manufacturing, commodities, petrochemical, food and beverage, telecommunications, and engineering industries, as well as local, state, provincial, and federal government entities. Montrose Environmental Group, Inc. was founded in 2012 and is headquartered in North Little Rock, Arkansas.

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.

Montauk Renewables, Inc., a renewable energy company, engages in recovery and processing of biogas from landfills and other non-fossil fuel sources. It operates in two segments, Renewable Natural Gas and Renewable Electricity Generation. The company develops, owns, and operates renewable natural gas (RNG) projects that captures methane and prevents it from being released into the atmosphere by converting it into either RNG or electrical power for the electrical grid. Its customers for RNG and renewable identification numbers (RIN) include large, long-term owner-operators of landfills and livestock farms, local utilities, and large refiners in the natural gas and refining sectors. Montauk Renewables, Inc. was founded in 1980 and is headquartered in Pittsburgh, Pennsylvania.

Aqua Metals, Inc. engages in reinventing metals recycling activities with its patented AquaRefining technology. The company's technology produces metals and alloys that can be returned into the battery manufacturing supply chain markets, as well as sells metals for use in various advanced manufacturing industries. Its AquaRefining, a low-emissions and recycling technology that replaces polluting furnaces and hazardous chemicals with electricity-powered electroplating to recover valuable metals and materials from spent batteries. Aqua Metals, Inc. was incorporated in 2014 and is headquartered in Reno, Nevada.

Ocean Power Technologies, Inc. develops and commercializes proprietary power platforms that generate electricity by harnessing the renewable energy of ocean waves in North America, South America, Europe, Australia, and Asia. The company offers PB3 PowerBuoy that generates power for use independent of the power grid in offshore locations. It also provides Next Generation PowerBuoy; subsea battery systems; and software, controls, sensors, integration services, and marine installation services. In addition, the company offers Wave Adaptive Modular Vessel (WAM-V) technology, which enables roaming capabilities for uncrewed maritime systems in waters; leases WAM-V robotics and access information; maritime domain awareness solutions; and strategic consulting services. Further, the company provides offshore data collection, integration, analytics, and real time communication for various applications. Ocean Power Technologies, Inc. serves public and private entities, and agencies that require remote offshore power. The company offers was incorporated in 1984 and is headquartered in Monroe Township, New Jersey.

Athena Technology Acquisition Corp. II does not have significant operations. It intends to effect a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or similar business combination with one or more businesses. The company was incorporated in 2021 and is based in New York, New York.