Heirloom Funding, Investors & Competitors

First Solar designs and manufactures solar photovoltaic panels, modules, and systems for use in utility-scale development projects. The company's solar modules use cadmium telluride to convert sunlight into electricity. This is commonly called thin-film technology. First Solar is the world’s largest thin-film solar module manufacturer. It has production lines in Vietnam, Malaysia, the United States, and India.

Nextpower (and its subsidiaries) is a leading provider of intelligent, integrated solar tracker and software solutions used in utility-scale and distributed generation solar projects around the world. Nextpower's products enable solar panels in utility-scale power plants to follow the sun’s movement across the sky and optimize plant performance. Nextpower has operations in the United States, Mexico, Spain and other countries in Europe, India, Australia, the Middle East, Africa, and Brazil.

Northvolt was a Swedish battery manufacturer founded in 2015 to build the world's greenest, sustainably sourced lithium-ion batteries. Powered entirely by renewable energy (wind and hydro), Northvolt aimed to produce batteries with the lowest carbon footprint globally. Backed by heavyweights like Volkswagen and Goldman Sachs, it aimed to supply European automakers. However, facing severe scaling challenges and massive debt, the company filed for bankruptcy in 2024–2025.

Round-the-Clock is a renewable energy initiative that integrates various power sources for uninterrupted supply.

1Komma5° is a Berlin-headquartered ClimateTech company delivering integrated energy solutions at 80 sites in seven markets including Germany, Austria, and the US. It installs photovoltaics systems up to 10 kWp, battery storage with 15 kWh capacity, heat pumps for heating, and EV charging stations bundled into subscription models for residential and commercial properties.

Climeworks is a Zurich-based direct air capture company operating modular plants like Orca and Mammoth in Iceland. The technology extracts CO2 from ambient air for permanent underground storage via mineralization with Carbfix, serving corporate net-zero commitments under Puro.earth certification standards.

Gradiant is a Boston-headquartered cleantech company developing water treatment solutions for industrial sectors including microelectronics, pharmaceuticals, food and beverage, lithium extraction, and renewable energy. Its Carrier Gas Enhanced Separation technology removes contaminants from wastewater, enabling zero liquid discharge compliance. Deployed in facilities across Asia, Europe, and North America, Gradiant serves clients like Samsung and PepsiCo with modular systems for ultrapure water production and resource recovery.

Palmetto is a New York City-headquartered clean energy company financing and installing solar panels, battery storage, EV chargers, and heat pumps for over 100,000 U.S. homes and businesses. Launched in 2017 from Charleston, South Carolina, it raised $1.5 billion in funding by 2023 and partners with retailers like Lowe's and wholesalers to distribute its financing platform nationwide. The firm integrates software for energy monitoring and offers leases with zero upfront costs.

GE Vernova is a global leader in the electric power industry, with products and services that generate, transfer, convert, and store electricity. The company has three business segments: power, wind, and electrification. Power includes gas, nuclear, hydroelectric, and steam technologies, providing dispatchable power. The wind segment includes wind generation technologies, including onshore and offshore wind turbines and blades. Electrification includes grid solutions, power conversion, electrification software, and solar and storage solutions technologies required for the transmission, distribution, conversion, and storage of electricity from the point of generation to the point of consumption.

Vistra Corp. is one of the largest power producers and retail energy providers in the USA. It owns 44 gigawatts of generation capacity, including natural gas (27 GW), nuclear (6.5 GW), coal (8.7 GW), and solar and battery storage (1.4 GW). The Cogentrix acquisition will add 5.5 GW of gas generation. Vistra's retail electricity business serves 5 million customers in 20 states, including almost a third of all Texas electricity consumers. Vistra emerged from the Energy Future Holdings bankruptcy as a stand-alone entity in 2016.

SK on is a Seoul-headquartered battery maker producing prismatic and pouch lithium-ion cells for electric vehicles from its Gwangmyeong and Seosan plants. Spun off from SK Innovation in 2021, it supplies packs to Ford Mustang Mach-E and Hyundai Ioniq 5. The company advances 46-series cells with NCM cathodes and partners with Solid Power on solid-state tech. SK on targets 200 GWh capacity by 2025.

Enilive is a Rome-headquartered subsidiary of Eni focused on sustainable mobility services. The company delivers integrated low-carbon solutions including biomethane production facilities, car-sharing fleets, and refueling stations for alternative fuels. Enilive operates across Italy with a network supporting electric vehicle charging and hydrogen infrastructure, advancing decarbonization in transportation through public-private partnerships.

TBEA Co Ltd is a China-based company that offers energy business solutions to service providers. The company distributes electric power transmission and transformation equipment. It provides solutions such as green technology, smart environmental protection, energy equipment for turnkey projects, and system solutions that range from surveying to design, construction, installation, and commissioning, as well as integration of training, operation, and maintenance. It also promotes the construction of green and efficient power grids. The company has a business presence in China and other countries.

Base Power is a residential energy provider offering backup battery systems and fixed-rate electricity plans in Texas. Dallas-headquartered, its home batteries supply up to three days of whole-home power during outages with automatic failover. Plans feature transparent pricing from 9 cents per kWh plus delivery and membership fees, serving deregulated market customers seeking cost predictability.

LONGi Green Energy Technology is one of the largest integrated solar company in the world. It produced 106 gigawatts of solar silicon wafers and 70 GW of solar modules in 2024. Solar silicon wafer and solar module contributed 10% and 80% of revenue in 2024, respectively. LONGi’s products are sold in more than 150 countries and regions.

Siemens Energy India Ltd is engaged in energy sector. The company offers fully integrated products, solutions and services across the energy value chain of oil and gas production, power generation and transmission for various customers such as utilities, independent power producers and engineering, procurement and construction (EPC) companies comprising of the entire part of the business.

Octopus Energy is a British energy supplier and technology group founded in 2015 that retails electricity and gas, invests in and manages renewable generation, and licenses software to other utilities. It has more than eight million retail customers worldwide, almost seven million of them in the United Kingdom, and became the largest UK electricity supplier after acquiring Shell Energy's retail arm in December 2023. Its Kraken platform, contracted to more than 50 million customer accounts, is licensed to third-party utilities, and its asset management arm runs over 400 wind and solar generators.

Kraken is a London-headquartered customer engagement platform for energy, water, and broadband providers across Europe and North America. Its technology stack includes billing, CRM, self-service portals, and smart metering analytics to streamline operations. Kraken serves utilities like Octopus Energy and OVO, enabling net-zero transitions through demand response and EV charging management. The platform processes millions of customer interactions monthly, supporting regulatory compliance in deregulated markets.