Energy Startups

Optimems develops smart, automated control systems and a software platform for managing microgrids and complex energy systems. It serves homeowners, businesses, aggregators, and energy producers, helping them ensure regulatory compliance, optimize performance, and improve financial results across energy markets.

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

Optiwatt provides a load management platform for utilities and grid operators to run virtual power plant and demand response programs by dispatching EVs, smart thermostats, and Level 2 chargers. It combines a consumer mobile/web app with an operator portal, optimization engine, device integrations, and incentive processing, serving investor-owned, public-power, and co-op utilities across North America.

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

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

Órigo Energia is a Brazilian distributed solar energy company that lets homes, apartments (including rented), businesses, and shops subscribe to solar energy without installing panels, applying credits from its 200+ solar farms to reduce customers' electricity bills. It operates as a subscription-based solar provider serving multiple states across Brazil.

1 investor

Orklys operates a platform that connects energy communities across Europe with individuals seeking to participate in renewable energy projects through community ownership, allowing easy investment and monitoring of local renewable energy initiatives.

1 investor

Ormat operates in the renewable energy sector, developing tools and technologies for renewable energy production and sustainable energy management. It focuses on efficient energy development and reducing energy waste.

1 investor

Orus Energy provides software that automatically shifts electricity consumption to optimal grid moments, enabling building owners to monetize their flexible electricity assets while supporting grid stability and reducing reliance on fossil fuel generation.

1 investor

Oryx Midstream provides crude oil logistics and custom midstream solutions to producers in the Permian Basin. The company merged into Plains Oryx Permian Basin joint venture in October 2021, focusing on crude oil transportation infrastructure, connectivity, and operational efficiency.

1 investor

Osage Valley Electric Cooperative is a utility cooperative providing electricity and internet services to rural Missouri communities.

1 investor

Otoro Energy develops a non-flammable, low-cost flow battery offering 10+ hours of storage duration for utilities powering critical infrastructure. The technology operates at neutral pH, is non-corrosive and non-toxic, and has been deployed in partnership with a Tier-1 US utility.

1 investor

Otovo sells residential solar panel packages that let homeowners lower their electricity bills and sell surplus power back to the grid through a plusskunde agreement. It also offers smart EV chargers that integrate the car into the home energy system.

1 investor

Outlast Power installs and operates battery storage systems at commercial and industrial sites to reduce electricity demand charges, covering all equipment and installation costs in exchange for a small install fee and a share of the savings. It serves facilities with high, consistent loads such as supermarkets, cold-storage warehouses, quick-service restaurant chains, manufacturers, and property managers/REITs.

1 investor

Ovarro provides monitoring and remote data solutions that help organizations manage and analyze data from critical infrastructure assets. It serves sectors including water, oil and gas, broadcast, process, energy, and transportation, working with a global network of partners.

1 investor

Over Easy Solar AS develops, manufactures and supplies pre-assembled vertical PV units for installing solar energy systems on green and flat roofs. The Norwegian company's lightweight, ballast-free VPV Unit targets rooftops previously unsuitable for solar due to weight or complexity, and has been deployed across projects in multiple European countries.

1 investor

20tree.ai (operating as Overstory) provides AI-powered vegetation intelligence for electric utilities, combining satellite and aerial imagery with local asset data to optimize vegetation management programs. The platform helps utilities reduce costs, manage risk from tree encroachment and wildfires, and improve grid reliability through data-driven decision-making.

1 investor

OX2 is a renewable energy developer and operator that designs, constructs, owns, and manages large-scale wind, solar, and energy storage projects. The company serves utilities, governments, and enterprises seeking clean energy infrastructure.

1 investor

Oxford nanoSystems (OnS) develops coating technologies that improve electrolysers and heat exchangers, allowing them to be smaller, lighter, more efficient and lower cost. The company focuses on coatings for alkaline water electrolysers to produce hydrogen more efficiently for clean energy applications.

1 investor

Oxon provides climate and environmental impact solutions for mountain resorts and outdoor recreation facilities. The company helps organizations reduce their environmental footprint and support conservation goals.

1 investor

Oxxio is a Dutch energy provider offering electricity (100% green power) and gas to consumers under fixed, variable, and dynamic pricing contracts. It provides an app for customers to monitor usage and manage energy costs in the Netherlands.

1 investor