Top Climate & Energy Companies by Revenue 2026

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.

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.

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.

San Jose residential solar brand restructured via $45M Complete Solaria bankruptcy acquisition Sept 2024; Q1 2025 $80.2M revenue profitable at $300M ARR with 906 employees targeting $1B+ through acquisitions competing with Sunrun for residential solar.

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.

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.

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.

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.

San Jose solid oxide fuel cell manufacturer (NYSE: BE) at $1.47B 2024 revenue; $5B Brookfield partnership for AI data center deployment with 1.4 GW installed at 1,000+ sites competing with Cummins for distributed clean power.

Fremont CA solar tracker market leader (NASDAQ: NXT) ~$3B revenue; TrueCapture AI sky-sensing software, $40M AI+Robotics acquisitions (OnSight/SenseHawk/Amir), Dr. Francesco Borrelli CARO competing with Array Technologies.

Commonwealth Fusion Systems (CFS) is building compact high-temperature superconducting fusion reactors, with SPARC demonstrating net energy gain targeted for 2025 and commercial reactors by early 2030s. HQ: Devens, MA.

AI electricity market analytics for grid-connected battery storage operators; revenue optimization across 5-minute energy auctions with regulatory compliance guidance for the rapidly growing US battery storage market.

SF battery intelligence software using ML for EV fleet and grid storage optimization; YC W20 $29-48.93M Salesforce Ventures Series AA Dec 2024 competing for battery lifecycle management and EV fleet health analytics.

Alga Biosciences is a biotech company engineering methane-reducing feed additives derived from seaweed to cut livestock methane emissions, addressing one of agriculture's largest climate impacts. HQ: San Francisco.

LA battery AI using reinforcement learning for grid-scale BESS optimization with CAISO certification; YC $3M seed from Rivian battery data science team competing with Stem for intelligent energy storage dispatch.

Cairo utility management platform reducing revenue losses by 45% for 11 utilities across Egypt and Philippines; $19M Endure Capital-backed with 1M+ metering endpoints competing for emerging market smart metering.

Santiago solar marketplace connecting Chilean homeowners to installers and financing; YC-backed $1.21M with former energy minister backing, facilitating 5MW+ of residential solar across 75% of Chile's regions.

AI supply chain carbon accounting platform with asset-level facility emissions for metals, mining, and commodities; $24.2M YC-backed serving thyssenkrupp and Rabobank for CBAM compliance and Scope 3 reporting.

Boden Sweden green hydrogen steel plant (rebranded from H2 Green Steel to Stegra 2024); €6.5B funded with 800MW electrolyzer and Volvo/Mercedes/Porsche pre-sales at 20-30% premium targeting 5M tonnes by 2030.

Oklo (OKLO) is a next-generation fission company developing advanced small modular nuclear reactors for clean baseload power. Has a 20-year power agreement with data center operator Switch. HQ: Santa Clara.

World's largest wind/solar producer and FPL Florida utility; $24.5B FY2024 revenue; IRA tax credits supercharge renewable economics; data center hyperscaler PPAs driving demand; 35+ GW renewable portfolio.

Kitekraft is a German airborne wind energy company developing kites that fly at high altitudes where wind is stronger and more consistent, generating cheaper energy than tower-based turbines. HQ: Munich.

Grid capacity mapping platform for solar and storage developers pre-computing interconnection availability; $66M raised serving AES and Invenergy with 500+ GW analyzed across MISO, ERCOT, PJM markets.

Helion Energy is a leading private nuclear fusion company pursuing the world's first commercial fusion power plant, with a power purchase agreement with Microsoft for 2028 delivery. HQ: Everett, WA.

Gridware is a grid intelligence company deploying sensor hardware on power lines to detect grid faults, prevent wildfires, and improve outage response for electric utilities. HQ: Redwood City, CA.

SINAI Technologies is a climate platform for enterprise carbon management, helping companies measure Scope 1, 2, and 3 emissions and build credible decarbonization roadmaps. HQ: San Francisco.

Wren is a personal carbon footprint tracker and offset subscription platform that helps individuals measure their climate impact and fund verified carbon removal projects. HQ: San Francisco.

Maritime carbon capture startup using calcium oxide chemistry to capture ship exhaust CO2 as solid calcium carbonate for offloading; onboard retrofit technology for shipping decarbonization.

Vista Power develops AI-optimized distributed energy storage and grid management systems, helping utilities and energy developers maximize renewable energy integration and grid resilience.

AI HVAC optimization platform reducing industrial energy costs 15-30% in Southeast Asian factories; YC W22 backed competing with Siemens and Honeywell for smart building energy management.

Satellite methane emissions monitoring platform for oil and gas, agriculture, and waste sectors; $4M from Initialized Capital, YC, and ESA BIC supporting Global Methane Pledge compliance.

ZeroAvia is a hydrogen-electric aviation company developing zero-emission powertrains for regional aircraft, targeting commercial certification for 9-19 seat aircraft. HQ: Hollister, CA.

ALT TEX creates AI-designed sustainable textile alternatives, using machine learning to develop high-performance fabrics that replace petroleum-based synthetics with bio-based materials.

Agentic AI platform accelerating renewable energy project development with site screening and permitting intelligence; $13M+ raised competing for clean energy infrastructure software.

Zephyr Fusion is developing compact fusion reactor technology for industrial heat applications, targeting decarbonization of manufacturing and process industries. HQ: San Francisco.

Impossible Metals is developing underwater robotic collectors for deep-sea polymetallic nodules, providing a low-impact source of critical metals for the clean energy transition.

Care Weather provides hyperlocal AI weather forecasting APIs for agriculture, insurance, and infrastructure operators, delivering precision forecasts at the field or asset level.