Energy Startups

NXTClean produces low-carbon renewable fuels including renewable diesel, sustainable aviation fuel, renewable natural gas, and hydrogen from organic waste materials and biomass for the transportation and aviation industries. The company operates production facilities on North America's west coast with access to Asia Pacific markets.

1 investor

Nyle Water Heating Systems (formerly Nyle Thermal) develops heat pump water heating equipment. The company operates in the energy and cleantech equipment sector.

1 investor

O'Hara's Son Roofing is a national commercial and industrial roofing contractor that installs, replaces, and maintains roofs for commercial properties including data centers, warehouses, and manufacturing facilities. Headquartered in Chicago and licensed in 48 states, the company also provides repair services and renewable energy solutions.

1 investor

Obeo Biogas designs, constructs, and operates anaerobic digestion systems for dairy farms that convert manure into renewable energy, sanitized bedding, and fertilizer. The company focuses on waste-to-value solutions that reduce greenhouse gas emissions and promote circular economy practices in agriculture.

1 investor

Oberon Fuels produces renewable dimethyl ether (rDME), a low- or carbon-negative fuel made from organic waste such as food, agricultural, and cellulosic waste, used to decarbonize LPG and transport renewable hydrogen. It targets hard-to-abate sectors including medium- and heavy-duty transportation, agricultural operations, industry, and heating.

1 investor

Obert designs and sells workwear specifically tailored for women in construction and industrial jobs, with anatomically designed fit, functional features like pockets, and lightweight durable materials. The company develops products in collaboration with its community of working women to address gaps in the traditional workwear market.

1 investor

OBR Cooling Towers provides cooling tower services including custom engineering, inspections, repairs, corrosion protection, and new construction for clients in industries such as hospitals, universities, and data centers. The family-owned company serves a national market with expertise in cooling tower reconstruction and refurbishment.

1 investor

Occam's Technologies develops carbon capture and oxygen combustion systems designed to enable decarbonization at the engine level by working with existing industrial infrastructure. The company targets emissions reduction in energy-intensive sectors without requiring large-scale infrastructure replacement.

1 investor

Ocean Infinity uses robotics, software, and advanced technology to deliver marine data services and solutions for offshore operations, with a focus on improving safety, efficiency, and environmental sustainability.

1 investor

Ocean Installer provides subsea engineering services including offshore structure installation, pipeline laying, and EPCI (engineering, procurement, construction, installation) services for complex marine projects globally.

1 investor

ORPC develops marine energy technology that generates electricity from free-flowing river and tidal currents, providing baseload power to communities and industrial users located on waterways. Headquartered in the U.S. with subsidiaries in Canada, Ireland, and Chile, the company serves the marine energy industry with grid power solutions.

1 investor

Ocean Yield operates in offshore oil and gas asset leasing, providing modern production vessels and floating storage and offloading units to energy companies.

1 investor

OceanSight develops marine sensors and interconnect solutions that provide ocean data to customers in offshore energy, subsea infrastructure, maritime security, environmental research, and fisheries operations. The company operates manufacturing and research facilities across North America and Europe.

1 investor

Octopus Energy Generation, part of the Octopus Energy Group, backs, builds, and manages renewable energy projects and manages green energy investment funds that finance clean energy infrastructure. It works with developers on large-scale renewable projects globally and runs smaller community-embedded initiatives in the UK.

1 investor

Odura is a Dutch energy consultancy that provides energy advice, solar PV expertise, and Scope 12 inspections, along with software and product development for flexible energy systems. It serves clients seeking guidance on energy systems and safety/quality compliance.

1 investor

OE Systems develops WaveMove, a wave energy converter that generates electricity from ocean waves using a surface collector and hydraulic cylinders. The system operates standalone or integrated with wind turbines to provide stable renewable energy with capacity factors above 50% in many locations.

1 investor

oekostrom AG is an Austrian energy supplier providing clean, renewable electricity and operating its own power plants. It serves both residential and commercial customers, including tailored offers for businesses with annual consumption above 100,000 kWh.

1 investor

Offen Petroleum is a wholesale distributor of fuel, lubricants, DEF, and premium additives, offering fuel-hauling services to industrial, propane, lubricants, retail gasoline, fleet, and government accounts. It serves customers across the United States in the energy and fuel distribution industry.

1 investor

Ohme provides integrated EV charging infrastructure and management software for shared residential parking in property developments. The platform combines hardware (ePod S chargers), a building manager dashboard, and payment processing to help developers and property managers deploy and operate charging across multiple sites.

1 investor

Oleo operates a biomanufacturing platform that converts non-edible biomass waste into low-carbon feedstocks—cellulosic sugars and renewable oils—for producing ethanol, renewable diesel, and sustainable aviation fuel. Its products target advanced fuel producers across aviation and marine shipping, supporting both HEFA and alcohol-to-jet SAF pathways.

1 investor

Omnicharge builds mobile, modular power systems that let organizations deploy electricity in flexible workspaces without rewiring or construction, including AC and USB-C stations, charging lockers, and furniture-mounted units. It offers these through a Power-as-a-Service model with a management dashboard, warranty support, and self-service checkout for facilities, IT, and workplace teams.

1 investor

ON.energy builds grid-safe, resilient energy infrastructure systems that integrate with existing power grids and support hospitals, data centers, and cities. The company focuses on making energy reliable, clean, abundant and affordable through AI-driven infrastructure solutions.

1 investor

ONE Nordic builds, services, and maintains Sweden's electrical infrastructure, offering contracting, engineering, maintenance, and metering services. Its customers include large and small power companies, municipalities, and the industrial and property sectors in Sweden.

1 investor

One Planet Studio builds and invests in ventures focused on accelerating decarbonization and addressing environmental challenges. The company operates as a studio supporting entrepreneurs and impact-driven startups in the clean technology and sustainable construction sectors.

1 investor