Top Climate & Energy Companies by Revenue 2026

Frankfurt-listed (ETR: ENR) energy technology company at €34.5B FY2024 revenue with 13-15% growth 2025; Siemens Gamesa offshore wind and gas turbines competing with GE Vernova and Vestas for energy transition infrastructure.

Oracle (ORCL) utility software serving 2,000+ utilities with CIS billing, smart meter data management, and grid operations; largest global utility software provider competing with SAP for smart grid modernization.

Baltimore largest US nuclear operator (NASDAQ: CEG) at $23.6B FY2024 revenue; 21 reactors, Three Mile Island restarted Sept 2024 for Microsoft AI data center, 24/7 carbon-free power competing with Vistra and NRG.

ABB (NYSE: ABB) industrial IoT platform connecting 70M+ devices for predictive maintenance and performance analytics; $32.2B revenue competing with Siemens MindSphere and GE Digital for industrial digital transformation.

Houston specialty utility contractor (NYSE: PWR) $23.6B FY2024 revenue (+13%); largest US electric power contractor, data center electrical construction, renewable energy BOP, competing with MYR Group and Primoris.

SAP (NYSE: SAP) utility industry software suite with meter-to-cash billing, asset management, and workforce management for electric/gas/water utilities; competing with Oracle Utilities for regulated utility operational systems.

Vistra Energy (VST) reported $16.7B revenue in FY2024, up 63% YoY (post-Energy Harbor acquisition). #1 competitive US power generator. Nuclear + gas + renewables. HQ: Irving, TX.

Competitive retail electricity + home services company; $29.1B FY2024 revenue; Vivint Smart Home acquisition 2023 bundles security/automation with power; ERCOT data center demand growth.

Utility clean energy software platform for demand response and EV managed charging; serving 80 utilities with behavioral energy programs and virtual power plant capabilities.

$2.4B revenue 2024 (+12% YoY); $324M EBITDA (+43% YoY); $208M free cash flow (+$110M YoY); 2M Xcel Energy meters Jan 2024; 7.7M HEDNO Greece contract 2025; smart meter market $28.2B 2024; leader

GE Vernova grid management software for utilities; Smallworld GIS, SCADA/EMS, and ADMS platforms benefiting from massive grid modernization investment for EV and renewable integration.

Clean energy storage company with 1,000 MW+ under management; Athena AI optimizes battery dispatch for commercial demand charge reduction competing with Tesla Powerpack and Fluence.

C3.ai enterprise AI application for energy optimization; ML applied to utility and industrial energy data for consumption reduction, predictive maintenance, and carbon management.

Swiss smart meter and grid technology company with CHF 2B revenue; advanced metering infrastructure and grid analytics for utility modernization serving hundreds of millions of deployed meters.

$300M funding; $1.4B valuation 2022 unicorn; $75M revenue Sept 2025; 286 employees; rebranded Avathon Oct 2024; BP/Shell/Hitachi customers; industrial AI leader

AI energy disaggregation platform turning smart meter data into appliance-level insights for utilities; EV charging detection and personalized efficiency programs competing with Itron and Uplight.

Uplight-acquired DERMS and VPP platform managing 3,500 MW of flexibility for National Grid and NextEra; $160M raised at $22.9M revenue enabling utilities to orchestrate batteries, EVs, and smart loads for grid balancing.

Cambridge home energy monitor using ML to identify appliances from electrical signatures; $56M GV-backed competing with Emporia for solar and EV household energy intelligence through panel-installed sensors.

Paris YC W23 hydrogen autonomous airships for pipeline/power line inspection with 220-mile range; $3.94M Ring Capital Series A Apr 2024 with Tesla co-founder backing competing with Percepto for zero-emission critical infrastructure aerial monitoring.

Oakland DLE lithium extraction technology ($318M total, $145M T. Rowe Price Series C); 5th gen 20x production rates with 1-acre = 10,000-acre evaporation pond efficiency and Great Salt Lake/Argentina deployments competing with SLB for lithium supply.

1KOMMA5° is a German climate-tech unicorn delivering solar, battery, heat pumps, and EV charging as a one-stop shop; €520M 2024 revenue (36% organic growth); 120,000+ customers; extended €150M pre-IPO round in Jul 2025; plans €100M AI/VPP investment.

Achieved first power delivery to the German national grid from its Geretsried closed-loop geothermal facility in 2025 — the world's first commercial project of its kind — backed by over $750M in equity from bp Ventures, BHP, Temasek, and the Canad...

Ensyn is a Canadian renewable energy company producing low-carbon biofuels from non-food biomass via proprietary Rapid Thermal Processing (RTP) technology; fuels used in industrial heating, power generation, and sustainable aviation fuel feedstock;

Type One Energy is a fusion startup commercializing stellarator fusion technology — an alternative to tokamak designs favored by ITER and Commonwealth Fusion; raised $29M seed in 2023; DOE Milestone-Based Fusion Development Program award recipient;

EnergyX develops direct lithium extraction (DLE) technology and solid-state battery systems; its LiTAS membrane technology achieves up to 90% lithium recovery versus 30-40% for conventional evaporation; raised $450M from General Motors and others;

Pathzero provides a SaaS platform for SMBs and enterprises to measure, manage, and reduce carbon emissions across Scope 1, 2, and 3; offers expert advisory support alongside software; targets businesses pursuing carbon neutrality or ESG reporting;

Industrial Sun is a Texas-based utility-scale solar developer focused on large-scale solar projects for industrial and commercial clients in the US; partners with landowners and rural communities for responsible solar site development adjacent to.

Marvel Fusion is a Munich-based nuclear fusion company using short-pulse high-intensity lasers and nanostructured fuel targets to develop clean fusion energy; raised €60M in 2022; partnered with Colorado State University for laser fusion research;

Electric Era's PowerNode EV charging stations use battery storage to deliver 200kW fast charging with only 120kW of grid demand; achieved 98%+ uptime; targeting 10,000 US installations by 2030; set 54-day installation record at Costco in May 2025.

YC-backed AI renewable energy developer finding profitable land/grid connections for solar and wind projects before competitors; addressing the 80-90% early-stage project failure rate as US needs 2,000 GW new capacity by 2035 for AI data centers.

Pacific Fusion is developing a magnetized target fusion system designed to compress deuterium-tritium fuel to achieve affordable, clean fusion energy; targets modular, lower-cost fusion power at various scales for industrial heat and electricity.

Pano AI raised $44M Series B in June 2025 led by Giant Ventures; protects nearly 30M acres across 10 U.S. states, 5 Australian states, and British Columbia with AI cameras detecting wildfires early for 250+ first responder agencies — contracted.

Better Energy is a leading Danish IPP developing and operating utility-scale solar plants across Denmark and Poland; partnered with Industriens Pension for 1GW+ of new solar projects; commissioned first 10MW battery storage system in March 2025.

AI forest carbon monitoring pioneer acquired by Carbon Direct in late 2025; satellite plus ML platform for verifying carbon credits across 50+ countries; raised $55M to address chronic measurement gaps undermining voluntary carbon market trust.

NASA-derived nickel-hydrogen battery company raised $300M Series B extension in Mar 2026 bringing total to $445M; lithium-free batteries rated for 30,000 cycles (10x lithium-ion lifespan) designed for grid-scale and AI data center applications.

Spanish startup raised $130M Series B in Apr 2026 for AI earth mapping satellite constellation; $225M total funding; L3Harris sensor deal secures defense-grade hardware; building Earth's continuously updated AI-ready physical change dataset.

Lyten develops lithium-sulfur batteries using a proprietary 3D graphene platform targeting 4x energy density over lithium-ion; raised $200M+ from Lockheed Martin, In-Q-Tel, and Stellantis; targeting EVs, aerospace, and defense; San Jose CA.

Tempe AZ US solar module leader (NASDAQ: FSLR) at $4.2B 2024 revenue (+27%) with 23.5 GW total capacity; $330M South Carolina factory adding 3.7 GW and EPEAT Climate+ certified competing with Qcells for IRA-compliant domestic utility solar.

Evergy (NYSE: EVRG) reported ~$2.6B revenue in FY2024; regulated electric utility serving 1.7M customers in Kansas and Missouri; multi-year capital program to modernize the grid, retire coal assets, and expand renewable generation capacity.

CubicPV (merger of 1366 Technologies + Hunt Perovskite) pivoted from US silicon wafer manufacturing to perovskite tandem modules after market dynamics shifted; achieved certified 24% efficiency perovskite minimodule with NREL in Jul 2025;

Sakuu's Kavian® dry-process 3D printing platform for battery electrodes entered commercial orders in Jan 2025; reduces factory footprint 60%, energy 40%, carbon 55% vs. conventional; partnered with SK On and International Battery Company;

Braven Environmental processes ~90% of waste plastics via proprietary pyrolysis Reactor Train technology; operates 24/7 in Zebulon, NC; building $145M Texas facility; signed long-term offtake deals with BASF and Chevron Phillips Chemical.

Kyoto Fusioneering is a Japanese fusion engineering company that raised ¥9.3B (Series C ext.); partnered with the US DOE and Oak Ridge National Laboratory in Jan 2026; advancing its FAST tokamak and UNITY power generation demonstrations.

General Fusion achieved first plasma with its LM26 Magnetized Target Fusion machine in March 2025; announced SPAC deal to list on Nasdaq as "GFUZ" in January 2026; targeting commercial fusion power to the grid by the early-to-mid 2030s.

World's leading solar design and sales platform with $537M raised at $4B valuation; named TIME Top GreenTech Company 2025; AI-powered PV design, remote shading analysis, and sales proposal tools used by 7,000+ solar installers globally.

Holland MI sodium-ion battery manufacturer (founded 2012) — PERMANENTLY CLOSED September 2025; $373M raised, $65.7M 2024 revenue, first US commercial sodium-ion (50,000-cycle Prussian blue), gigafactory funding failure forced shutdown.

Jetti Resources uses proprietary catalytic technology to unlock copper extraction from low-grade primary sulfides (chalcopyrite); raised $168M total at a $2.5B valuation; backed by BHP, Freeport-McMoRan, BMW i Ventures, and Rothschild.