Energy Startups

ESS builds non-lithium battery energy storage systems — including sodium-ion and iron flow batteries — for utilities, data centers, commercial and industrial facilities, and critical infrastructure. The company offers both long-duration storage hardware and an energy management platform for deploying and optimizing storage assets.

5 investors

Estes designs and manufactures advanced battery platforms using domestically-sourced magnesium and new material compositions to achieve higher energy density for electrified marine, aviation, rail, and commercial vehicles. The company employs first-principles engineering and fully domestic production to meet supply chain resilience and Buy America requirements.

5 investors

exnaton offers a modular, API-integrated SaaS platform that lets energy utilities launch time-series-based, data-driven electricity products such as dynamic tariffs, smart EV charging, prosumer tariffs, energy sharing, and PPAs without replacing existing ERP or billing systems. It serves energy utilities, service providers, grid operators, power suppliers, IPPs, and large real estate companies across Europe.

5 investors

Feon develops high-performance battery electrolytes using a discovery platform (EDGE) to improve battery performance, safety, and cost across various battery chemistries. Its electrolytes support clean energy storage for applications including mobility and electronics.

5 investors

Forge is an HVAC company that installs and upgrades home heating and cooling systems, with a focus on heat pumps, using in-house crews. It serves homeowners in the Metrowest area of Massachusetts.

5 investors

Founder Factor is an investment firm for YC founders, with a team of accomplished YC alumni and operators who have collectively invested in over 1,200 companies and co-founded more than 100. The firm focuses on early-stage investments primarily in Gen AI, Fintech, and Energy sectors.

5 investors

Gaussion develops magnetic battery control technology that improves charging speed, heat generation, and lifetime performance across different cell formats and chemistries for electric vehicles, stationary storage, and industrial applications.

5 investors

Geminus builds physics-native AI systems that understand, predict, and optimize complex industrial infrastructure in real time by combining physics-based simulation with real-world data and uncertainty-aware reasoning. The company serves energy, industrial, space, and defense sectors with mission-critical system optimization and monitoring.

5 investors

Generate Capital is a sustainable infrastructure investment and operating platform that provides capital and expertise for developers, businesses, and communities to invest in and operate sustainable assets across power, mobility, waste, green digital, water, agriculture, and industrial decarbonization sectors. The firm has invested over $10 billion since 2014 and manages over 2,000 assets globally.

5 investors

Gradyent offers digital tools for optimizing and decarbonizing industrial steam grids, aimed at industrial operators seeking to reduce emissions. The company operates in the energy and industrial heating software space.

5 investors

GridPoint develops building energy management and optimization technology for commercial buildings, aimed at reducing energy consumption, decarbonizing facilities, and supporting grid modernization. It serves commercial sectors such as retail and quick service restaurants through hardware, cloud software, and energy management services.

5 investors

Group14 develops silicon battery materials, specifically SCC55®, for automotive and consumer electronics manufacturers. The company operates commercial manufacturing facilities in North America and Europe to scale production of advanced anode materials for lithium-ion and silicon batteries.

5 investors

Helicity Space develops fusion-based space propulsion and power technology intended to drive deep space transports for human and robotic exploration, national security, and commercial space missions. The company targets the space industry with fusion propulsion engines for interplanetary travel and resource applications.

5 investors

Hexium develops Atomic Vapor Laser Isotope Separation (AVLIS) technology that uses lasers and electric fields to enrich isotopes, starting with lithium. Its enriched isotopes are aimed at nuclear energy, nuclear medicine, and industrial applications.

5 investors

HomeBoost provides home energy efficiency solutions to improve energy affordability. The company offers three distinct offerings focused on making energy efficiency accessible to homeowners.

5 investors

Imperium Technologies builds an integrated electro-mechanical steam trap paired with a real-time steam system intelligence platform to detect and manage steam system waste, faults, and emissions. It serves industrial operators and service providers who traditionally relied on manual inspections and older infrastructure.

5 investors

Infyos provides a supplier mapping and compliance platform for developers, asset managers, and battery manufacturers to manage regulatory requirements including EU Battery Regulation, UFLPA, and CSRD, while enabling financing and lender due diligence. The platform helps assess supplier compliance and generate evidence for financial institutions and regulatory bodies.

5 investors

Inlyte Energy manufactures iron-sodium battery energy storage systems for utility-scale and industrial applications. The company develops sodium metal chloride chemistry-based batteries to provide reliable, long-duration energy storage for grid resilience and renewable energy integration.

5 investors

ION Storage Systems develops solid-state battery technology, including its Cornerstone cell, and ships samples to consumer electronics manufacturers. It is a U.S.-based company in the energy storage and battery materials sector.

5 investors

Ionomr develops ion-exchange membrane and polymer materials for clean energy applications including fuel cells, hydrogen production, and energy storage. The company's products enable manufacturers to improve performance and durability while reducing costs and environmental impact.

5 investors

IronGrid provides foundation model-based software for industrial teams to assess risk and quality, with a focus on battery and energy storage systems. The platform helps teams identify quality issues, quantify uncertainty, and make more informed decisions in manufacturing and energy applications.

5 investors

Jaza is a utility company providing decentralized energy across Sub-Saharan Africa, combining hardware, software, and local talent into a distribution network. It focuses on building foundational energy and logistics systems for the region.

5 investors

Karman Industries builds the Heat Processing Unit (HPU), a modular thermal management system designed to cool high-power AI data center chips while eliminating water use and enabling heat reuse for power generation and district heating. It targets operators of AI data centers and industrial energy systems seeking more efficient cooling.

5 investors

Lithosquare develops an AI platform for mineral exploration that uses physics-based modeling of ore body formation rather than statistical pattern matching. The platform serves geoscientists and mining companies seeking to improve discovery rates and reduce exploration costs.

5 investors