Energy Startups

Sightline Institute is a nonpartisan, nonprofit research and policy organization focused on the Cascadia region (the US Pacific Northwest and British Columbia). It produces research and policy solutions on climate and energy, democracy and elections, and housing and cities for journalists, decision-makers, and advocates.

1 investor

Commercializes organosilicon materials for lithium-ion battery electrolytes.

1 investor

Si-Lib develops pure silicon anodes for lithium-ion batteries, a materials technology aimed at energy-storage applications. The company originated from research at Tel Aviv University.

1 investor

Swap Robotics builds 100% electric autonomous robots for utility-scale solar sites, handling vegetation management, solar panel laying during construction, and materials movement. It designs both hardware and software in-house and serves solar developers, EPC contractors, and asset owners across North America.

1 investor

SiliconJoule develops advanced battery technology for mass production using lead-acid battery forms integrated with silicon-inspired technology, targeting personal mobility vehicles, energy storage systems, hybrid cars, and industrial backup systems.

1 investor

Silixa develops distributed fibre optic sensing systems for real-time monitoring in energy, infrastructure, and environmental applications. The company's technologies enable high-density sensor coverage across extended areas for subsea seismic acquisition, microseismic monitoring, and structural sensing to support energy production and carbon storage verification.

1 investor

Siltrax develops silicon-based hydrogen fuel cells and PEM electrolyzers aimed at lower costs, manufacturability, and reliability. The company operates in the hydrogen and clean energy technology industry.

1 investor

Silver Creek Midstream is a private midstream company providing crude oil gathering, transportation, and storage services in Wyoming, serving the Powder River, Big Horn, and Wind River Basins.

1 investor

Silver Creek Oil & Gas is a privately held independent oil and natural gas exploration and production company focused on acquiring, developing, and exploring resources in the Arkoma Basin of Oklahoma and Sherman Basin of North Texas.

1 investor

Silver Hill Energy Partners is a private oil and gas company that acquires, develops, and optimizes unconventional oil and natural gas assets, primarily in the Delaware Basin of West Texas. It partners with institutional investors and manages large-scale oil and gas operations and infrastructure.

1 investor

Silvertech is commercialising a patented lateral silicon carbide (SiC) FET transistor technology aimed at improving power MOSFETs used for power conversion in applications like EVs, data centres, grid synchronisation, and inverters. Developed with Griffith University's Microtechnology Centre, the company targets renewable energy and power electronics with devices intended to be cheaper, smaller, and more efficient than existing SiC and GaN options.

1 investor

SIMA is an impact investment fund manager that creates and manages funds bringing together institutional, impact, and development finance investors to back double-bottom-line businesses in renewable energy, affordable housing, and financial inclusion. It also provides advisory services, builds social businesses, and operates a foundation for catalytic impact-first investments.

1 investor

Locus is a place-based analysis platform that integrates climate risk assessment, regional decarbonization planning, energy network analysis, and spatial planning tools for local authorities, utilities, and developers.

1 investor

Simply Solar is a California-based solar energy company. The available page content consists only of a cookie consent notice and privacy language, so details about its products and services could not be extracted.

1 investor

Sinergy Flow is a deeptech startup developing a low-cost, sustainable redox flow battery for long-duration (multi-day) energy storage, using earth-abundant materials such as sulfur to support renewable energy penetration. Based in Milan, Italy, its modular and scalable technology targets long duration energy storage aligned with circular economy principles.

1 investor

SINN Power develops and manufactures photovoltaic technologies for water, land, and specialized applications, including floating PV systems for gravel lakes, reservoirs, and maritime environments, as well as the SOcean modular offshore platform. Based in Germany, it offers end-to-end services covering planning, permits, financing, installation, operation, maintenance, and power marketing for renewable energy projects.

1 investor

Zhejiang Sinopont Technology, founded in 2006, develops, manufactures, and sells encapsulant films for photovoltaic solar modules, including POE, EPE, white film, and EVA product lines with customization options. It serves the solar/new energy industry and operates production bases in central and eastern China, with additional domestic and overseas facilities in development.

1 investor

Sionic Energy develops a 100% silicon anode battery platform delivered as a licensable IP service, designed to drop into existing 21700, pouch, and prismatic cell manufacturing lines without new equipment. It targets OEMs in electrification markets including aviation, consumer electronics, e-mobility, automotive EVs, and grid storage, offering higher energy density (370 Wh/kg) and fast charging as an alternative to graphite anodes.

1 investor

Siqens develops decentralized green hydrogen production solutions that enable on-site hydrogen generation without costly compression and transport infrastructure. The company addresses the last-mile distribution challenge in establishing a global green hydrogen economy.

1 investor

SISA Energy provides software and services for energy auditing and retrofit planning in the building industry. The company helps building owners optimize energy efficiency through digital assessment and planning tools.

1 investor

Sistine Solar develops SolarSkin, a customizable overlay for solar panels that lets the panels match a roof's aesthetic or display custom designs. Founded at MIT, the company sells to residential and commercial solar customers across the United States.

1 investor

SITECO is a lighting company that provides information on public and private funding programs for efficient indoor and outdoor lighting installations in Germany, Austria, and Switzerland. The company helps municipalities and businesses access subsidies for LED lighting retrofits and associated control systems.

1 investor

SiteFuel provides on-site fuel delivery and fuel management services for large construction projects, including data center builds, temporary power generators, and fleet fueling. It serves mega construction, industrial, and logistics fleet operations across the United States, combining project management with a technology platform.

1 investor

SitelogIQ helps organizations modernize buildings to improve energy efficiency, health, sustainability, and productivity while reducing carbon emissions. The company works across schools, hospitals, apartments, offices, factories, warehouses, and retail centers to deliver facility solutions.

1 investor