Radar · Energy Efficiency Tech in California
Best Energy Efficiency Tech Companies in California, United States
The 443 best Energy Efficiency Tech companies in California, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: View.
By Rohit KhannaTrends & Stories
443companies tracked
$9.9Bdisclosed funding
3unicorns
175have raised
FLIAR INTELLIGENCE · ENERGY EFFICIENCY TECH × CALIFORNIA
Our analysis of 50 Energy Efficiency Tech companies
$7.8b in tracked funding; 86% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
50companies analysed
86%cloud-native stacks
2025funding peak (by rounds)
4unicorns
2014median founding year
556kcombined LinkedIn audience
36%of audience held by top 3
5companies hiring publicly (12 mo)
Ranked: Best Energy Efficiency Tech companies in California
| # | Company | Disclosed funding | Last round | Employees | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | View Provider of AI and app-based smart windows glasses for buildings 82Innovation top 21%Patents top 21%Funding top 22%Product top 22% All 13 signals ▾Innovationtop 21% Patentstop 21% Fundingtop 22% Producttop 22% Talenttop 28% Moattop 29% Markettop 32% Growthtop 39% Techtop 45% AItop 45% Fin. healthtop 46% Globaltop 47% Customersbottom 35% Innovation: 2,366 patents (top 1% of patent-holders) · 928 filings since 2022 vs 1074 in 2017-21 Patents: 2,366 patents matched (strict assignee match) · 928 filings since 2022 vs 1074 in 2017-21 rank vs industry peers · Fliar Intelligence Index 82/100 | $3.5B | 43 mo ago | 870 | Andrew Min Co-CEO | DrupalPHPSalesforce+25 | 2,366 patents Electrochromic smart glass control, optical switching, and thin‑film device manufacturing | — |
| 2 | Redaptive 🦄 Provider of fully-funded energy efficiency and sustainability solutions. 60Funding top 16%Moat top 26%Product top 30%Market top 37% All 9 signals ▾Fundingtop 16% Moattop 26% Producttop 30% Markettop 37% Talenttop 38% Globaltop 48% Techtop 49% Growthbottom 40% Newsbottom 21% Funding: Raised $726M across 11 rounds · 11 rounds over 11 yrs (1.0/yr) Moat: Editorial + unicorn rating 9/10 · Unicorn rank vs industry peers · Fliar Intelligence Index 60/100 | $726M | 13 mo ago | 326 | Arvin Vohra Co-Founder & CEO | WordPressMySQLPHP+27 | — | — |
| 3 | Halio Manufacturer of electrochromic glasses 64AI top 15%Moat top 21%Funding top 22%Patents top 23% All 10 signals ▾AItop 15% Moattop 21% Fundingtop 22% Patentstop 23% Innovationtop 29% Talenttop 38% Markettop 49% Globalbottom 42% Growthbottom 25% Newsbottom 22% AI: Holds AI/ML patents (G06N-family CPC) Moat: Editorial + unicorn rating 8/10 · IP moat: 43 patents rank vs industry peers · Fliar Intelligence Index 64/100 | $564M | 31 mo ago | 70 | Bruce Sohn CEO | — | 43 patents Smart‑window electrochromic systems: materials, multilayer design, predictive control, and failure mitigation | — |
| 4 | Turntide 🦄 Provider of smart energy management solutions | $524M | 48 mo ago | 112 112 → 199 (+78%) · sector median +32% | Mark Johnston Co-Founder | WordPressApple iCloud MailMicrosoft 365+23 | — | 1 award |
| 5 | Nanosys Developer of nanotechnology-based displays | $267M | 46 mo ago | 16 | Larry Bock Founder | Squarespace CommerceCart FunctionalitySquarespace+20 | 1,109 patents Nanostructured quantum‑dot materials and processes for advanced LED/display integration | — |
| 6 | Bridgelux Manufacturer and developer of LED chips | $235M | 171 mo ago | 42 | — | DrupalMariaDBPHP+19 | 1,085 patents Patents concentrated in electrical & electronics | — |
| 7 | SPAN Smart energy management technology platform that modernizes residential electrical systems 82Funding top 13%Innovation top 18%Patents top 20%Growth top 28% All 11 signals ▾Fundingtop 13% Innovationtop 18% Patentstop 20% Growthtop 28% Moattop 28% Producttop 35% Talenttop 38% Techtop 42% Customerstop 42% Markettop 43% Globalbottom 42% Funding: Raised $231M across 10 rounds · 10 rounds over 8 yrs (1.2/yr) Innovation: 78 patents (top 21% of patent-holders) · 64 filings since 2022 vs 14 in 2017-21 rank vs industry peers · Fliar Intelligence Index 82/100 | $231M | 5 mo ago | 220 | Jireh Seow Co-Founder | WebflowApple iCloud MailGoogle Workspace+22 | 78 patents Smart electrical panel and load management systems for residential/commercial energy control | 1 job opening |
| 8 | Stem Provider of AI and cloud-driven energy solutions | $229M | 94 mo ago | 195 195 → 435 (+123%) · sector median +32% | John Carrington Chief Executive Officer and Director | WordPressMySQLPHP+30 | — | 1 launch · 4 awards |
| 9 | Willdan Provider of project management solutions for the energy industry | $200M | 83 mo ago | 1,540 1,540 → 1,173 (-24%) · sector median +32% | Thomas Brisbin CEO | Apple iCloud MailWindows ServerMicrosoft ASP.NET+13 | — | 1 expansion |
| 10 | Frore Systems Developer of thermal management solutions for data centers and electronic devices 72Innovation top 16%Patents top 17%Funding top 18%Moat top 33% All 10 signals ▾Innovationtop 16% Patentstop 17% Fundingtop 18% Moattop 33% Newstop 34% Growthtop 35% Talenttop 38% Marketbottom 48% Techbottom 42% Globalbottom 40% Innovation: 194 patents (top 16% of patent-holders) · 163 filings since 2022 vs 31 in 2017-21 Patents: 194 patents matched (strict assignee match) · 163 filings since 2022 vs 31 in 2017-21 rank vs industry peers · Fliar Intelligence Index 72/100 | $190M | 3 mo ago | 75 | Suryaprakash Ganti Co-Founder & CTO | WebflowVimeocore-js+12 | 194 patents MEMS-enabled active cooling and fluidic actuation for LED and waterproof electronic systems | — |
| 11 | Glo-USA Nanotechnology based LED technology provider | $161M | 105 mo ago | 18 | — | — | — | — |
| 12 | Everactive Developer of self-powered chips for wireless ambient Internet of Things devices 64Funding top 21%Moat top 21%Patents top 26%Innovation top 27% All 9 signals ▾Fundingtop 21% Moattop 21% Patentstop 26% Innovationtop 27% Growthtop 31% Techtop 45% Talentbottom 49% Marketbottom 43% Globalbottom 39% Funding: Raised $160M across 11 rounds · 11 rounds over 14 yrs (0.8/yr) Moat: Editorial + unicorn rating 8/10 · IP moat: 51 patents rank vs industry peers · Fliar Intelligence Index 64/100 | $160M | 21 mo ago | 91 | David Wentzloff Co-founder and Co-CTO | WordPressApple iCloud MailGoogle Workspace+22 | 51 patents Patents concentrated in mechanical & energy engineering | — |
| 13 | Swell Energy Provider of home energy systems integrating solar, storage, and virtual power | $134M | 42 mo ago | 111 | — | StoryblokSentryApple iCloud Mail+22 | — | — |
| 14 | Particle Developer of a prototype to production connectivity platform for IoT 55Tech top 23%Funding top 24%Customers top 24%News top 30% All 12 signals ▾Techtop 23% Fundingtop 24% Customerstop 24% Newstop 30% Moattop 35% Growthtop 40% Producttop 47% Talentbottom 49% Marketbottom 47% Patentsbottom 39% Globalbottom 39% Innovationbottom 35% Tech: 67 technologies across 6/8 capability areas · Cloud: Amazon Cloudfront, Amazon S3 Funding: Raised $130M across 8 rounds · 8 rounds over 12 yrs (0.7/yr) rank vs industry peers · Fliar Intelligence Index 55/100 | $130M | 15 mo ago | 109 109 → 110 (+1%) · sector median +32% | Zach Supalla Co-Founder & CEO | Cart FunctionalityShopifyApple iCloud Mail+31 | 5 patents Pharma skin‑inflammation formulations, audio speaker hardware, VR headset devices, graphic‑design software. | 1 launch |
| 15 | Molekule Manufacturer of air purification and humidification devices with filtration technology 50Funding top 28%Innovation top 29%Patents top 29%Product top 34% All 13 signals ▾Fundingtop 28% Innovationtop 29% Patentstop 29% Producttop 34% Moattop 38% Techtop 41% Growthtop 45% Customerstop 50% Talentbottom 49% Marketbottom 44% Globalbottom 40% Newsbottom 36% Fin. healthbottom 29% Funding: Raised $97.9M across 6 rounds · 6 rounds over 10 yrs (0.6/yr) Innovation: 77 patents (top 23% of patent-holders) · 39 filings since 2022 vs 38 in 2017-21 rank vs industry peers · Fliar Intelligence Index 50/100 | $98M | 13 mo ago | 92 92 → 81 (-12%) · sector median +32% | Jason Dibona CEO | ShopifyApple iCloud MailMicrosoft 365+16 | 77 patents Indoor air purification using photocatalytic and UV-based filtration technologies | — |
| 16 | OhmConnect Provider of energy management software solutions | $90M | 48 mo ago | 77 | — | Amazon WebstoreWebflowApple iCloud Mail+29 | — | — |
| 17 | Bidgely Provider of a solution for consumers to monitor and manage their household energy use | $88M | 57 mo ago | 39 | Abhay Gupta Co-Founder & CEO | WordPressMySQLPHP+33 | 53 patents Appliance-level energy disaggregation and demand‑side management analytics for smart grids | — |
| 18 | Metronome Usage-based invoice management solutions for small businesses 60Funding top 24%Talent top 28%Moat top 31%Growth top 35% All 8 signals ▾Fundingtop 24% Talenttop 28% Moattop 31% Growthtop 35% Techtop 39% Marketbottom 41% Globalbottom 32% Newsbottom 20% Funding: Raised $78.0M across 4 rounds · 4 rounds over 4 yrs (1.0/yr) Talent: 3 named leaders on record · 3 C-suite/founder profiles curated rank vs industry peers · Fliar Intelligence Index 60/100 | $78M | 15 mo ago | 50 | Ledion Bitincka Co-Founder and CTO | WebflowSentryApple iCloud Mail+30 | — | 1 partnership |
| 19 | Happy Provider of centralized maintenance, asset, and property management software solutions | $78M | 52 mo ago | 30 | Jindou Lee Co-Founder & CEO | WebflowSentryZendesk+32 | — | — |
| 20 | Sunverge Developer of smart energy storage and energy management systems | $75M | 36 mo ago | 33 | Dean Sanders Co-Founder & CTO | — | — | — |
| 21 | GridX Cloud-based platform offering meter billing solutions | $68M | 50 mo ago | 53 53 → 107 (+102%) · sector median +32% | Chris Black CEO | WordPressMySQLPHP+28 | 8 patents Wholesale energy transaction metering using retail meter data and high‑volume micro‑payment processing. | 1 job opening |
| 22 | Ambient Photonics Provider of solar cells for connected devices | $61M | 33 mo ago | 11 11 → 13 (+18%) · sector median +32% | Bates Marshall Co-Founder & CEO | WordPressMySQLPHP+27 | 61 patents Copper‑redox dye‑sensitized solar cell materials and related organic dye chemistries | — |
| 23 | Leap Provider of demand response management solutions | $58M | 30 mo ago | 49 | Thomas Folker Co-Founder & CEO | Framer SitesReactAmazon Web Services+13 | 29 patents Microwave-based mobile pavement recycling and on‑site asphalt production systems | — |
| 24 | Radiant Nuclear 🦄 Developer of portable nuclear microreactors designed to replace diesel generators 55Funding top 26%Growth top 28%Moat top 37%Market bottom 49% All 8 signals ▾Fundingtop 26% Growthtop 28% Moattop 37% Marketbottom 49% Talentbottom 49% Techbottom 41% Globalbottom 32% Partnersbottom 32% Funding: Raised $55.0M across 7 rounds · 7 rounds over 6 yrs (1.2/yr) Growth: Web rank 10,000,000 → 5,000,000 YoY · Fresh capital in last 24 mo rank vs industry peers · Fliar Intelligence Index 55/100 | $55M | 6 mo ago | 34 | Doug Bernauer Founder & CEO | GridsomeApple iCloud MailGSAP+9 | — | — |
| 25 | Quilt AI-based heat control systems for homes 55Funding top 24%Talent top 28%Growth top 35%Moat top 39% All 10 signals ▾Fundingtop 24% Talenttop 28% Growthtop 35% Moattop 39% Techtop 45% AItop 45% Producttop 46% Globalbottom 39% Marketbottom 33% Customersbottom 2% Funding: Raised $42.0M across 3 rounds · 3 rounds over 3 yrs (1.0/yr) Talent: 3 named leaders on record · 3 C-suite/founder profiles curated rank vs industry peers · Fliar Intelligence Index 55/100 | $42M | 6 mo ago | 30 | Matthew Knoll Co-Founder & CTO | Craft CMSPHPYii+20 | — | 2 launchs · 1 expansion · 1 award |
| 26 | Verdigris AI and SaaS-driven energy analytics platform for the management of facilities and commercial buildings 48Funding top 23%Growth top 28%Talent top 28%Moat top 41% All 11 signals ▾Fundingtop 23% Growthtop 28% Talenttop 28% Moattop 41% Techtop 42% Producttop 46% Newsbottom 41% Globalbottom 39% Marketbottom 32% Innovationbottom 31% Patentsbottom 24% Funding: Raised $41.7M across 13 rounds · 13 rounds over 15 yrs (0.9/yr) Growth: Headcount 20 → 27 (+35%) across vintages · Fresh capital in last 24 mo rank vs industry peers · Fliar Intelligence Index 48/100 | $42M | 3 mo ago | 27 | Mark Chung Co-Founder & CEO | WebflowUptimeRobotApple iCloud Mail+18 | 2 patents Electrical load identification and disaggregation via waveform analysis for power monitoring | — |
| 27 | Therma Provider of solutions for temperature and humidity monitoring | $37M | 40 mo ago | 28 28 → 48 (+71%) · sector median +32% | — | — | 74 patents Cryopreservation methods and materials for organs, tissues, and biological samples | — |
| 28 | Ecotrak Provider of SaaS-driven CMMS software for commercial spaces | $32M | 26 mo ago | 25 | David Bennett Co-Founder | StoryblokApple iCloud MailNode.js+26 | — | — |
| 29 | Axiom Cloud AI AI & SaaS-driven refrigeration management solution for facility managers | $28M | 27 mo ago | 20 20 → 18 (-10%) · sector median +32% | Nikhil Saralkar Co-Founder & CTO | — | 8 patents AI-driven monitoring, leak detection, and energy management for commercial refrigeration systems | 2 launchs |
| 30 | Gradient Provider of smart HVAC products for residential applications | $27M | 35 mo ago | 61 61 → 53 (-13%) · sector median +32% | Vince Romanin Co-Founder | Cart FunctionalityShopifyShop Pay+24 | 28 patents Therapeutic bioelectrical stimulation and membrane charge modulation devices, plus agricultural pitch plow technology. | 1 partnership |
| 31 | Oloid Cloud-based platform for based attendance management | $26M | 19 mo ago | 29 | Mohit Garg Co-Founder & CEO | — | 8 patents Contactless smart‑card emulation and authentication systems for NFC identity verification | 1 job opening |
| 32 | FranklinWH Manufacturer of home energy management and battery storage solutions | $25M | 33 mo ago | 54 | Cheung Lam Co-Founder | Node.jsElement UIVideoJS+23 | — | — |
| 33 | Sunflower Labs Provider of AI-driven home security solutions using smart lighting and drones 62Funding top 31%Innovation top 35%Growth top 35%Patents top 36% All 11 signals ▾Fundingtop 31% Innovationtop 35% Growthtop 35% Patentstop 36% Moattop 37% Talenttop 38% Techtop 43% Newstop 44% AItop 45% Globalbottom 39% Marketbottom 34% Funding: Raised $22.1M across 5 rounds · 5 rounds over 10 yrs (0.5/yr) Innovation: 18 patents (top 54% of patent-holders) · 5 filings since 2022 vs 3 in 2017-21 rank vs industry peers · Fliar Intelligence Index 62/100 | $22M | 7 mo ago | 30 | Chris Eheim Founder + CTO | Node.jsNext.jsstyled-components+10 | 18 patents Autonomous multicopter drones for security surveillance, auto‑landing, and sensor‑network integration | — |
| 34 | GlacierGrid Provider of energy management solutions | $19M | 27 mo ago | — | Manik Suri Co-Founder & CEO | HubSpot CMS HubApple iCloud MailGoogle Workspace+23 | 2 patents Industrial energy management and PWM-based equipment power control | — |
| 35 | Ivy Energy Cloud-based platform offering bill calculation software solutions for solar energy operators | $18M | 26 mo ago | 38 38 → 50 (+32%) · sector median +32% | Dover J Founder & CEO | Apple iCloud MailGoogle WorkspaceRadix UI+16 | — | — |
| 36 | Gridium SaaS-driven energy management and data analytics platform | $18M | 39 mo ago | 24 24 → 39 (+62%) · sector median +32% | — | — | 3 patents Software platforms for utility energy consumption monitoring and demand-response optimization. | — |
| 37 | Harvest Thermal Provider of thermal battery systems for heating, cooling, and hot water 53Innovation top 29%Patents top 29%Funding top 32%Moat top 32% All 9 signals ▾Innovationtop 29% Patentstop 29% Fundingtop 32% Moattop 32% Techtop 33% Growthtop 45% Talentbottom 49% Globalbottom 40% Marketbottom 27% Innovation: 25 patents (top 46% of patent-holders) · 22 filings since 2022 vs 3 in 2017-21 Patents: 25 patents matched (strict assignee match) · 22 filings since 2022 vs 3 in 2017-21 rank vs industry peers · Fliar Intelligence Index 53/100 | $13M | 8 mo ago | 12 12 → 17 (+42%) · sector median +32% | Jane Melia Co-Founder and CEO | SentryNode.jsReact+17 | 25 patents Low-emission HVAC control and thermal‑storage management systems for building energy efficiency | — |
| 38 | Flair Systems Manufacturer of smart vents for home temperature control 50Tech top 26%Growth top 35%Funding top 37%Talent top 38% All 9 signals ▾Techtop 26% Growthtop 35% Fundingtop 37% Talenttop 38% Customerstop 39% Moattop 39% Producttop 46% Globalbottom 38% Marketbottom 25% Tech: 60 technologies across 6/8 capability areas · Cloud: Amazon Cloudfront, Amazon S3 Growth: Fresh capital in last 24 mo rank vs industry peers · Fliar Intelligence Index 50/100 | $8M | 2 mo ago | 13 | Kenny Tay Co-Founder & CTO | ShopifyBootstrapAmazon Web Services+44 | — | — |
| 39 | SkyCool Systems Provider of radiative cooling systems | $5M | 12 mo ago | 11 | Eli Goldstein CEO | WordPressMySQLPHP+21 | — | 1 award |
| 40 | EP Analytics HPC experts providing performance analysis and optimization software and services | $5M | 14 mo ago | 12 | Laura Carrington Co-Founder & VP | — | 56 patents Distributed asynchronous data transfer and multi-view analytics visualization platforms | — |
| 41 | Domatic Provider of low-voltage smart building solutions. It offers a simplified system for wiring and networking… | $4M | 14 mo ago | 9 | Jim Baldwin Co-Founder & CEO | — | 3 patents Patents concentrated in mechanical & energy engineering | — |
| 42 | Karman Industries Provider of industrial heat solutions designed to reduce energy waste 16Funding top 41%Talent bottom 49%Moat bottom 44%Tech bottom 42% All 8 signals ▾Fundingtop 41% Talentbottom 49% Moatbottom 44% Techbottom 42% Patentsbottom 36% Globalbottom 33% Innovationbottom 31% Marketbottom 28% Funding: Raised $4.0M across 3 rounds · 3 rounds over 2 yrs (1.5/yr) Talent: 1 named leader on record · 1 C-suite/founder profile curated rank vs industry peers · Fliar Intelligence Index 16/100 | $4M | 9 mo ago | — | Chiranjeev Kalra Co-Founder & CTO | WebflowVimeoGSAP+15 | 5 patents Patents concentrated in transport & manufacturing processes | 1 award |
| 43 | HomeBoost Online platform providing home energy assessment solutions | $4M | 19 mo ago | — | Adam Sussman Co-Founder | WordPressMySQLPHP+31 | — | 1 job opening |
| 44 | nodaFi Provider of software for managing facility operations, tasks, assets, and spend | $4M | 23 mo ago | — | Michael Loyda Co-Founder and Chief Revenue Officer | — | — | 1 internship |
| 45 | Rock Rabbit Provider of AI-based software solutions for construction management | $3M | 18 mo ago | — | Aimee Bailey Co-Founder & CEO | — | — | — |
| 46 | Flexfire LEDs Provider of LED lighting systems and lighting control sensors 48Innovation top 35%Growth top 35%Product top 36%Tech top 38% All 8 signals ▾Innovationtop 35% Growthtop 35% Producttop 36% Techtop 38% Talentbottom 49% Fundingbottom 48% Marketbottom 34% Globalbottom 25% Innovation: 3 product lines · Deep-tech classification: Tech Hardware Growth: Fresh capital in last 24 mo rank vs industry peers · Fliar Intelligence Index 48/100 | $2M | 14 mo ago | — | Brenton Mauriello CEO | BigCommerce B2B EditionCart FunctionalityShogun Page Builder+33 | — | 3 launchs |
| 47 | Canetia Analytics Provider of AI-based structural analysis solutions | $1M | 14 mo ago | — | Graham Sutherland Founder & CEO | — | 10 patents Remote condition monitoring and data analytics for physical asset assessment | — |
| 48 | InviscidAI Developer of physics-informed artificial intelligence platform for building system optimization | $500K | 5 mo ago | — | Kabir Jain Co-Founder | — | — | — |
| 49 | ZutaCore Provider of waterless liquid cooling solutions for artificial intelligence and computing | $397K | 15 mo ago | 48 | Erez Freibach Co-Founder & CEO | HubSpot CMS HubApple iCloud MailGoogle Workspace+20 | — | 2 job openings |
| 50 | Cambio Provider of a real estate sustainability platform | $125K | 4 mo ago | 7 | Elvis Wong Co-Founder | WebflowAmazon Web ServicesCloudflare Turnstile+19 | — | — |
Top 12 Energy Efficiency Tech companies in California
#1
Series D · San Jose, California · founded 2018 · 75 employees$190Mraised▾
Series D · San Jose, California · founded 2018 · 75 employees
Developer of thermal management solutions for data centers and electronic devices. The company offers direct-to-chip liquid cooling and solid-state active air cooling products. These cooling solutions are applicable to consumer devices, industrial embedded systems, and data centers. The company's products aim to improve performance and enable compact designs.
Fliar Intelligence Index™ 72how this company ranks against its industry peers
Innovation
top 16%Patents
top 17%Funding
top 18%Moat
top 33%News
top 34%Growth
top 35%Innovation: 194 patents (top 16% of patent-holders) · 163 filings since 2022 vs 31 in 2017-21 · Deep-tech classification: Tech Hardware
Patents: 194 patents matched (strict assignee match) · 163 filings since 2022 vs 31 in 2017-21 · Latest publication 2026
Funding: Raised $190M across 3 rounds · 3 rounds over 8 yrs (0.4/yr) · Last round Series D (Mar 2026)
Audience (LinkedIn): 9k LinkedIn followers
Funding rounds
- Mar 2026Series D$143M
- May 2024Series C$90M
- Dec 2022Series B$100M
- 2018Series A—
Founders & team
Investors
Qualcomm Ventures, Mayfield, Clear Ventures, Addition, Fidelity Investments, Prosperity7 Ventures
Tech stack
CloudflareCloudflare Bot ManagementGoogle Font ApiGoogle Hosted LibrariesHstsHttp/3
#2
Series C · San Francisco, California · founded 2014 · 220 employees$231Mraised▾
Series C · San Francisco, California · founded 2014 · 220 employees
Smart energy management technology platform that modernizes residential electrical systems. Its solutions replace traditional electrical panels with smart systems that provide homeowners with real-time visibility into household energy usage, circuit-level monitoring, and remote control of appliances and connected devices. It is designed to support modern electrified homes by integrating technologies such as home batteries, electric vehicle chargers, solar systems, HVAC systems, and heat pumps into a centralized energy management ecosystem.
Fliar Intelligence Index™ 82how this company ranks against its industry peers
Funding
top 13%Innovation
top 18%Patents
top 20%Growth
top 28%Moat
top 28%Product
top 35%Funding: Raised $231M across 10 rounds · 10 rounds over 8 yrs (1.2/yr) · Last round Series C (Jan 2026)
Innovation: 78 patents (top 21% of patent-holders) · 64 filings since 2022 vs 14 in 2017-21 · Deep-tech classification: Tech Hardware
Patents: 78 patents matched (strict assignee match) · 64 filings since 2022 vs 14 in 2017-21 · Latest publication 2026
Audience (LinkedIn): 35k LinkedIn followers — 6.4% of this cohort's audience
Hiring (LinkedIn): 1 hiring post in 12 mo (public)
Funding rounds
- Jan 2026Series C$163.3M
- Sep 2025Series B$25M
- Jun 2025Grant (prize money)$999.8K
- Apr 2025Grant (prize money)$999.8K
Founders & team
Investors
ArcTern Ventures, Capricorn, Incite, One Zero Capital, Wireframe Ventures, Ulu Ventures
Tech stack
AccessibeAhrefsApple Icloud MailAuraBootstrapCloudflare
#3
Series B · Mountain View, California · founded 2011 · 27 employees$41.7Mraised▾
Series B · Mountain View, California · founded 2011 · 27 employees
AI and SaaS-driven energy analytics platform for the management of facilities and commercial buildings. The cloud-based solution allows users to optimize operations, facility uptime, and manage energy costs. Its wireless sensors enable real-time identification, disaggregation, and analysis of the loads in buildings, providing insights into behavior and usage. It also provides an IoT Energy Meter that helps to track energy consumption with its smart sensors.
Fliar Intelligence Index™ 48how this company ranks against its industry peers
Funding
top 23%Growth
top 28%Talent
top 28%Moat
top 41%Tech
top 42%Product
top 46%Funding: Raised $41.7M across 13 rounds · 13 rounds over 15 yrs (0.9/yr) · Last round Series B (Mar 2026)
Growth: Headcount 20 → 27 (+35%) across vintages · Fresh capital in last 24 mo
Talent: 3 named leaders on record · 3 C-suite/founder profiles curated
Audience (LinkedIn): 4k LinkedIn followers
Funding rounds
- Mar 2026Series B—
- Aug 2023Series B$10M
- Dec 2021Series B$1.1M
- Jan 2021Series B$7.1M
Founders & team
Investors
DCVC, Solea Energy, Jabil, Verizon, StartX, FOUNDER.org
Tech stack
ContentfulLinkedin Sign-InGoogle MapsUbuntuBootstrapVimeo
#4
Series E · San Francisco, California · founded 2015 · 326 employees$726.5Mraised▾
Series E · San Francisco, California · founded 2015 · 326 employees
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Fliar Intelligence Index™ 60how this company ranks against its industry peers
Funding
top 16%Moat
top 26%Product
top 30%Market
top 37%Talent
top 38%Global
top 48%Funding: Raised $726M across 11 rounds · 11 rounds over 11 yrs (1.0/yr) · Last round Conventional Debt (May 2025)
Moat: Editorial + unicorn rating 9/10 · Unicorn · 10 curated direct competitors tracked
Product: 2 published apps (1.2k installs) · Company stage: Series E
Audience (LinkedIn): 70k LinkedIn followers — 12.7% of this cohort's audience
Funding rounds
- May 2025Conventional Debt$650M
- Oct 2024Series E$100M
- Aug 2023Conventional Debt$125M
- Mar 2023Series E$250M
Founders & team
Investors
AB CarVal, CBRE, ENGIE New Ventures, Evergy Ventures, Linse Capital, CPP Investments
Tech stack
Amazon Web ServicesCdnjsCloudflareCloudflare Bot ManagementContentsquareCore-Js
#5
Series D · Los Angeles, California · founded 2019 · 34 employees$55Mraised▾
Series D · Los Angeles, California · founded 2019 · 34 employees
Developer of portable nuclear microreactors designed to replace diesel generators. The company offers a compact reactor with equipment to generate electricity. The reactors leverage air cooling and high-speed turbomachinery. The units can provide thermal power for facility heating or water desalination. The fuel is designed to be meltdown-proof. The reactors are assembled, fueled, and tested in the factory. After fuel depletion, the entire container is shipped back for refueling.
Fliar Intelligence Index™ 55how this company ranks against its industry peers
Funding
top 26%Growth
top 28%Moat
top 37%Market
bottom 49%Talent
bottom 49%Tech
bottom 41%Funding: Raised $55.0M across 7 rounds · 7 rounds over 6 yrs (1.2/yr) · Last round Series D (Dec 2025)
Growth: Web rank 10,000,000 → 5,000,000 YoY · Fresh capital in last 24 mo
Moat: Editorial + unicorn rating 4/10 · Unicorn · 9 curated direct competitors tracked
Audience (LinkedIn): 35k LinkedIn followers — 6.3% of this cohort's audience · 217 engagements/post (7.2× cohort median)
Funding rounds
- Dec 2025Series D$300M
- Feb 2025Series C$66M
- Oct 2024Series C$100M
- Apr 2023Series B$40.7M
Founders & team
Investors
Union Square Ventures, Boost VC, Cantos Ventures, Tribe Capital, Decisive Point, McKinley Capital
Tech stack
Apple Icloud MailCloudflareCloudflare Browser InsightsCloudflare Rocket LoaderCore-JsDocusign
#6
Series B · Redwood City, California · founded 2022 · 30 employees$42Mraised▾
Series B · Redwood City, California · founded 2022 · 30 employees
AI-based heat control systems for homes. It designs and develops smart heat pumps for consumer applications. Its ductless heat pump systems help in heating, ventilation, and air conditioning buildings.
Fliar Intelligence Index™ 55how this company ranks against its industry peers
Funding
top 24%Talent
top 28%Growth
top 35%Moat
top 39%Tech
top 45%AI
top 45%Funding: Raised $42.0M across 3 rounds · 3 rounds over 3 yrs (1.0/yr) · Last round Series B (Dec 2025)
Talent: 3 named leaders on record · 3 C-suite/founder profiles curated
Growth: Fresh capital in last 24 mo
Audience (LinkedIn): 10k LinkedIn followers
Activity (LinkedIn): 2 product launches · 1 awards · 1 expansions announced in 12 mo
Funding rounds
- Dec 2025Series B$20M
- Apr 2024Series A$33M
- May 2023Seed$9M
Founders & team
Investors
Lowercarbon Capital, Gradient Ventures, Garage Capital, Incite Ventures, Energy Impact Partners, Galvanize Climate Solutions
Tech stack
CloudflareCloudflare Bot ManagementCloudflare Browser InsightsCore-JsCraft CmsEnvoy
#7
Series B · San Francisco, California · founded 2014 · 13 employees$7.6Mraised▾
Series B · San Francisco, California · founded 2014 · 13 employees
Manufacturer of home automation devices for temperature control. Its device is equipped with Bluetooth, sensors. The vent works with existing internet-connected thermostats to adjust the temperature in individual rooms being used, using occupancy sensors and historical occupancy data. It can also be paired with existing connected cooling units to control temperature. Its systems can be controlled via smartphones, tablets, and smartwatches.
Fliar Intelligence Index™ 50how this company ranks against its industry peers
Tech
top 26%Growth
top 35%Funding
top 37%Talent
top 38%Customers
top 39%Moat
top 39%Tech: 60 technologies across 6/8 capability areas · Cloud: Amazon Cloudfront, Amazon S3 · Devops: Envoy
Growth: Fresh capital in last 24 mo
Funding: Raised $7.6M across 4 rounds · 4 rounds over 11 yrs (0.4/yr) · Last round Series B (Mar 2026)
Funding rounds
- Mar 2026Series B—
- Dec 2024Series A—
- Sep 2022Series A$7.6M
- Feb 2022Seed$108.5K
Founders & team
Investors
HAX, Active Impact Investments, Lowercarbon Capital, SOSV, Skyview Capital, Resilience Capital Partners
Tech stack
Amazon PayAmazon S3Amazon SesAmazon Web ServicesAmerican ExpressApple Pay
#8
Series B · San Francisco, California · founded 2016 · 30 employees$22.1Mraised▾
Series B · San Francisco, California · founded 2016 · 30 employees
Provider of AI-driven home security solutions using smart lighting and drones. The smart lights are integrated into a stick form factor that also contains motion sensors to detect intruders. The stick can be stuck on the grounds of a house and when a trespasser is detected. When unusual activity is detected, the companion drone can be sent to collect video. The drone is a quadcopter that flies autonomously and records video using a combined IR and optical camera.
Fliar Intelligence Index™ 62how this company ranks against its industry peers
Funding
top 31%Innovation
top 35%Growth
top 35%Patents
top 36%Moat
top 37%Talent
top 38%Funding: Raised $22.1M across 5 rounds · 5 rounds over 10 yrs (0.5/yr) · Last round Series B (Nov 2025)
Innovation: 18 patents (top 54% of patent-holders) · 5 filings since 2022 vs 3 in 2017-21 · Deep-tech classification: Tech Hardware
Growth: Fresh capital in last 24 mo
Audience (LinkedIn): 6k LinkedIn followers
Funding rounds
- Nov 2025Series B$16M
- Dec 2023Series A$1.5M
- Jan 2022Series A$15M
- 2019Seed—
Founders & team
Investors
General Catalyst, Stanley Ventures, Gentian Investments, Drone Fund, All Turtles, Pbfs.com
Tech stack
Framer SitesGoogle MapsGoogle Tag ManagerGoogle WorkspaceHstsHttp/3
#9
Public · San Francisco, California · founded 2014 · 92 employees$97.9Mraised▾
Public · San Francisco, California · founded 2014 · 92 employees
Manufacturer of air purification and humidification devices with filtration technology. The company offers air purifiers utilizing PECO technology alongside HEPA filtration. These devices aim to remove pollutants, allergens, and other particles from indoor air. The company also provides humidifiers designed to maintain comfortable humidity levels. Replacement filters for the air purification devices are available for purchase.
Fliar Intelligence Index™ 50how this company ranks against its industry peers
Funding
top 28%Innovation
top 29%Patents
top 29%Product
top 34%Moat
top 38%Tech
top 41%Funding: Raised $97.9M across 6 rounds · 6 rounds over 10 yrs (0.6/yr) · Last round Post IPO (May 2025)
Innovation: 77 patents (top 23% of patent-holders) · 39 filings since 2022 vs 38 in 2017-21 · 11 product lines
Patents: 77 patents matched (strict assignee match) · 39 filings since 2022 vs 38 in 2017-21 · Latest publication 2026
Audience (LinkedIn): 11k LinkedIn followers
Funding rounds
- May 2025Post IPO$6.6M
- May 2023Post IPO$10M
- Sep 2021Angel—
- Aug 2020Angel—
Founders & team
Investors
Founders Circle Capital, Inventec, Crosslink Capital, Uncork Capital, TransLink Capital, Foundry
Tech stack
Animate.CssApple Icloud MailApple PayBootstrapCart FunctionalityCloudflare
#10
Acquired · San Francisco, California · founded 2011 · 109 employees$129.9Mraised▾
Acquired · San Francisco, California · founded 2011 · 109 employees
Developer of a prototype to production connectivity platform for IoT. Its Photon Wi-Fi and the Electron 2G3G cellular are primary prototyping platforms for integrating connectivity into devices. The product is primarily aimed at designers and developers rather than at enterprises.
Fliar Intelligence Index™ 55how this company ranks against its industry peers
Tech
top 23%Funding
top 24%Customers
top 24%News
top 30%Moat
top 35%Growth
top 40%Tech: 67 technologies across 6/8 capability areas · Cloud: Amazon Cloudfront, Amazon S3 · Devops: Nginx
Funding: Raised $130M across 8 rounds · 8 rounds over 12 yrs (0.7/yr) · Last round Series C (Mar 2025)
Customers: App rating 4.2★ (289 reviews) · Marquee-customer mentions: top 30% of tracked companies
Audience (LinkedIn): 24k LinkedIn followers — 4.4% of this cohort's audience
Activity (LinkedIn): 1 product launches announced in 12 mo
Funding rounds
- Mar 2025Series C$5M
- Dec 2022Series C$12.2M
- Nov 2021Series C$30M
- Nov 2019Series C$40M
Founders & team
Investors
O'Reilly AlphaTech Ventures, Root Ventures, HAX, Collab Fund, Spark Capital, Qualcomm Ventures
Tech stack
AceAmazon CloudfrontAmazon S3Amazon Web ServicesAmerican ExpressApple Icloud Mail
#11
Series A · California City, California · founded 2019 · 12 employees$13.2Mraised▾
Series A · California City, California · founded 2019 · 12 employees
Provider of thermal battery systems for heating, cooling, and hot water. The company offers an all-in-one system that integrates heating, cooling, and hot water with built-in storage. The system optimizes energy use based on weather forecasts and user routines. It uses grid electricity when it is cost-effective and environmentally friendly. The company's system is designed to work with existing ducting and smart thermostats.
Fliar Intelligence Index™ 53how this company ranks against its industry peers
Innovation
top 29%Patents
top 29%Funding
top 32%Moat
top 32%Tech
top 33%Growth
top 45%Innovation: 25 patents (top 46% of patent-holders) · 22 filings since 2022 vs 3 in 2017-21 · Deep-tech classification: Tech Hardware
Patents: 25 patents matched (strict assignee match) · 22 filings since 2022 vs 3 in 2017-21 · Latest publication 2025
Funding: Raised $13.2M across 8 rounds · 8 rounds over 7 yrs (1.1/yr) · Last round Series A (Oct 2025)
Audience (LinkedIn): 4k LinkedIn followers
Funding rounds
- Oct 2025Series A$1.1M
- Dec 2024Series A$2M
- Sep 2024Grant (prize money)$2M
- Aug 2023Series A$8.8M
Founders & team
Investors
Astia, VertueLab, Energy Labs, Band of Angels, America’s Seed Fund, Earth Foundry
Tech stack
CloudflareCloudflare Bot ManagementCore-JsFacebook PixelGoogle AnalyticsGoogle Font Api
#12
Acquired · San Francisco, California · founded 2020 · 50 employees$78Mraised▾
Acquired · San Francisco, California · founded 2020 · 50 employees
Usage-based invoice management solutions for small businesses. It features solutions for invoice generation, custom credit pools, cost-basis tracking, tiering, and more. It offers cloud marketplace integrations, and automates order-to-cash with integrations for accounting, quoting, & invoicing platforms.
Fliar Intelligence Index™ 60how this company ranks against its industry peers
Funding
top 24%Talent
top 28%Moat
top 31%Growth
top 35%Tech
top 39%Market
bottom 41%Funding: Raised $78.0M across 4 rounds · 4 rounds over 4 yrs (1.0/yr) · Last round Series C (Feb 2025)
Talent: 3 named leaders on record · 3 C-suite/founder profiles curated
Moat: Editorial + unicorn rating 8/10 · Soonicorn · 9 curated direct competitors tracked
Audience (LinkedIn): 17k LinkedIn followers — 3.1% of this cohort's audience
Activity (LinkedIn): 1 partnerships (incl. Metronome) announced in 12 mo
Funding rounds
- Feb 2025Series C$50M
- Jan 2024Series B$43M
- Feb 2022Series A$30M
- Seed$5M
Founders & team
Investors
Andreessen Horowitz, General Catalyst, New Enterprise Associates, Greyhound Capital, Activant Capital, Workday
Tech stack
Amazon AlbAmazon CloudfrontAmazon SesAmazon Web ServicesApple Icloud MailAws Certificate Manager
Funding & investor landscape
$9.9Btotal disclosed funding
165companies funded
571disclosed rounds
1rounds last 90 days
Most active investors
Notable founders
Suryaprakash Ganti
Co-Founder & CTO · Frore Systems
Seshu Madhavapeddy
Co-Founder & CEO · Frore Systems
Jireh Seow
Co-Founder · SPAN
Arch Rao
Founder & CEO · SPAN
Mark Chung
Co-Founder & CEO · Verdigris
Jonathan Chu
Cofounder · Verdigris
Arvin Vohra
Co-Founder & CEO · Redaptive
Manesh Shah
Chief Administrative & Legal Officer · Redaptive
Doug Bernauer
Founder & CEO · Radiant Nuclear
Matthew Knoll
Co-Founder & CTO · Quilt
Bill Kee
Co-Founder & COO · Quilt
Kenny Tay
Co-Founder & CTO · Flair Systems
Prism market signals · United States · country-scoped Prism corpus, 1,608,968 docs
Market landscape — 10 sub-themes by coverage
Share of Energy Efficiency Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
RESEARCH IN CALIFORNIA · Energy
How research on Energy Efficiency in California is moving
A read on the academic research around Energy Efficiency in California — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 143 papers.
UC Berkeley, UCLA, and UC Davis lead California's 143 energy-efficiency papers, focusing dominantly on Building Energy and Comfort Optimization, with an optimistic tone (mean stance 0.52, breakthroughs outpacing concerns).
143 papers · stance +0.52 · 29% breakthrough · 14% concern
top institutions
- University of California, Berkeley26
- University of California, Los Angeles18
- University of California, Davis14
- University of California, Irvine10
- University of California, San Diego8
leading researchers
Jaeho Lee · Matthew J. Ellis · Aaswath P. Raman · Caton Mande · Chi‐Cheng Chu · Loren dela Rosa
prism intelligence · tone & topics
90% positive · 3% critical tone
BusinessEnvironmentSustainabilityHome ImprovementElectronicsTransportation
▲
Breakthroughs40 · 28%
▼ 29%→23% share
▼0.8× share momentum14 median citations32% since 2021mostly methods-led
Passive cooling and radiative cooling emerged brand-new with 5 and 4 papers, signaling newly emerging breakthrough research directions.
rising sub-themes (early→recent)
- Heat pump1→4
Newly emergingPassive cooling 0→5 · Radiative cooling 0→4 · Thermal 0→3
Landmark A radiative cooling structural material · 1,495 cites
◆
Advancements77 · 54%
▼ 61%→50% share
▼0.8× share momentum5 median citations36% since 2021mostly methods-led
Passive cooling advancements intensified sharply, rising from 1 to 7 papers; radiative cooling newly entered with 6.
rising sub-themes (early→recent)
- Passive cooling1→7
- Thermal2→5
- Heat pump4→6
- Heat exchanger3→5
Newly emergingRadiative cooling 0→6 · Overheating (electricity) 0→3 · Porosity 0→3
Landmark Distributed Optimal Energy Management in Microgrids · 480 cites
▼
Concerns19 · 13%
▲ 5%→23% share
▲4.6× share momentum6 median citations68% since 2021mostly empirical
Heat pump concerns are newly emerging with 5 papers as overall concern field-share surged from 5% to 23%.
rising sub-themes (early→recent)
- Heat exchanger1→3
Newly emergingHeat pump 0→5 · Thermodynamics 0→3
Landmark Energy Efficiency: The New Holy Grail of Data Management Systems Research · 97 cites
Common questions
How many Energy Efficiency Tech companies are there in California, United States?
Radar tracks 443 indexable Energy Efficiency Tech companies headquartered in California, United States that meet our profile-completeness bar.
What is the total funding raised by Energy Efficiency Tech companies in California, United States?
The Energy Efficiency Tech companies in California, United States on this list have raised a combined $9.9B in disclosed equity funding across 165 funded companies.
Which is the highest-funded Energy Efficiency Tech company in California, United States?
View is the highest-funded Energy Efficiency Tech company in California, United States, with $3.5B in disclosed equity funding.
How many Energy Efficiency Tech companies in California, United States are funded?
165 of the 443 Energy Efficiency Tech companies in California, United States on this list have disclosed at least one equity funding round.
How many Energy Efficiency Tech unicorns are there in California, United States?
3 Energy Efficiency Tech companies in California, United States on this list are valued at $1B or more.
Who are the top investors in California, United States Energy Efficiency Tech companies?
The most active investors in California, United States Energy Efficiency Tech companies on this list include Climate Capital, OSTI, Elemental, Plug and Play Tech Center, Navitas Capital.
Rohit KhannaTrends & Stories
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.