Energy Startups

OneCharge is a software platform for the EV charging ecosystem, serving individual drivers, businesses, and industry partners with tools to manage their charging needs.

1 investor

OneEnergy Partners is a middle-market energy investing and operating firm that acquires and develops oil and natural gas working interests, mineral and royalty positions, and energy-transition assets across North America, with a focus on the Northern Delaware Basin in Southeastern New Mexico. It serves mineral and royalty owners seeking liquidity as well as investors in upstream and decarbonization opportunities.

1 investor

OnePlanetCapital is a venture capital firm that invests in early-stage climate technology companies with global reach and impact. The firm operates multiple investment vehicles including a core fund targeting 6-8 companies annually, an SEIS fund for UK climate tech startups, a syndicate structure for investors and family offices, and an institutional fund for later-stage, high-growth portfolio companies.

1 investor

ONiON Mobility manufactures electric three-wheeled and two-wheeled vehicles and develops battery-swapping infrastructure. The company operates a mobile ecosystem for ride-hailing and logistics services across Cambodia and Southeast Asia.

1 investor

OnSwitch provides a digital platform for evaluating and purchasing commercial solar systems, using patented aerial imaging and AI to generate pre-costed quotes for rooftop and parking lot installations. It serves businesses, public agencies, and non-profits with end-to-end solar project design, financing, procurement, and installation.

1 investor

SDCL Efficiency Income Trust (SEIT) is an investment company focused on energy efficiency and onsite generation projects, funding solutions that deliver cheaper, cleaner, and more reliable energy. It serves commercial, industrial, and district energy customers as a dedicated energy efficiency project investor.

1 investor

Onzo provides energy management and insights tools for consumers, helping them monitor usage, budget, manage prepaid accounts, and understand their energy consumption patterns.

1 investor

1 investor

Oorjan provides solar energy systems for residential and commercial customers.

1 investor

OpConnect manufactures hardware for electric vehicle charging, with products made in Portland, Oregon. The company serves fleet operators and property managers across the USA and is expanding internationally to Canada, Puerto Rico, and Europe.

1 investor

Open Climate Fix develops solar and renewable energy forecasting and nowcasting technology to help electricity system operators and power traders improve forecasting accuracy and reduce reliance on fossil-fuel backup plants. Its work supports grid decarbonisation efforts, with a stated focus on the UK.

1 investor

Open Motors (formerly OSVehicle) develops open, modular electric vehicle platforms that let new and existing car manufacturers build their own models while reducing R&D time and cost, and serves as a reference platform for mobility startups to build their technology on. The company is a B2B business in the electric and autonomous vehicle space.

1 investor

Open Power helps businesses that generate energy on-site optimise and sell their surplus electricity exports to the grid, handling export terms, onboarding, and payments. It serves on-site energy generators and works with installers in the UK.

1 investor

OptiFuel Systems develops fuel efficiency technology for transportation, partnering with manufacturers of rail, transit, and commercial vehicle systems.

1 investor

Optimal Solar offers a solar energy product for communities and commercial entities with large rooftops (over 40,000 sq. ft.) or land plots. Its VIA solution targets markets in the US, Latin America, the Caribbean, and West Africa.

1 investor

Optimitive develops AI software for real-time optimization of industrial processes, aiming to improve energy efficiency, cut costs, and reduce emissions. It serves large process industries such as cement, chemical, petrochemical, metal, and pulp & paper across multiple global regions.

1 investor

OptiSeis Solutions provides seismic exploration and subsurface imaging services with an emphasis on high-resolution data processing and advanced reservoir characterization. The company serves oil and gas exploration clients seeking cost-effective, environmentally mindful geophysical solutions.

1 investor

Orb Energy is a vertically integrated solar company that manufactures solar panels and provides rooftop and ground-mounted solar PV systems, solar water heating, and battery storage, along with in-house collateral-free financing for commercial, industrial, and residential customers. Operating in India since 2006, it serves businesses and homeowners looking to adopt solar power.

1 investor

Orbital Marine Power develops tidal energy solutions to generate clean, predictable electricity and support the transition away from fossil fuels.

1 investor

A personal blog featuring writing and notes on climate, energy, and related technical topics such as hydrogen and carbon dioxide removal.

1 investor

Orchid Solar develops modular concentrated solar thermal technology, based on patented Oxford University optics, that focuses sunlight to produce industrial heat up to 1,000°C without burning fuel. It targets high-temperature manufacturers such as steel, cement, brick, ceramics and glass plants, and has run prototype tests in India and Kenya.

1 investor

Ore Energy develops long-duration iron-air battery technology for renewable energy storage using cost-effective, recyclable materials like iron, water, and air. The company targets the global sustainable energy transition market with energy storage solutions.

1 investor

Oregon Environmental Council is an organization focused on environmental advocacy and policy in Oregon, publishing reporting and analysis on issues such as data center energy use, climate goals, and the transition to electric vehicles. Its work centers on environmental protection and climate action within the state.

1 investor

OTEC is an electric cooperative that provides electricity and related services to its member-owners in Eastern Oregon, operating on cooperative principles. It also runs community programs, including wildfire prevention education for children.

1 investor