Best Energy Tech Companies in San Diego, United States
The 86 best Energy Tech companies in San Diego, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Sapphire Energy.
Our analysis of 79 Energy Tech companies
$38.9b in tracked funding; 92% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy Tech companies in San Diego
| # | Company | Disclosed funding | Last round | Employees | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | Sapphire Energy Business energy price comparison website helping UK businesses save on energy bills | $390M | 126 mo ago | 1 | — | — | 269 patents Algal biofuel production and photosynthetic synthesis of high‑value chemicals. | — |
| 2 | Wildcat Discovery Technologies Developer of advanced materials for rechargeable and primary batteries 74Growth top 13%Funding top 26%Patents top 26%Product top 26% All 10 signals ▾Growthtop 13% Fundingtop 26% Patentstop 26% Producttop 26% Moattop 26% Innovationtop 30% Newstop 39% Talentbottom 49% Marketbottom 47% Globalbottom 44% Growth: Headcount 54 → 122 (+126%) across vintages · Fresh capital in last 24 mo Funding: Raised $184M across 10 rounds · 10 rounds over 18 yrs (0.6/yr) rank vs industry peers · Fliar Intelligence Index 74/100 | $184M | 8 mo ago | 122 122 → 62 (-49%) | Mark Gresser President & CEO | — | 328 patents Advanced lithium‑ion battery cathodes, anodes, high‑salt electrolytes, and cell diagnostics | 1 partnership |
| 3 | Beam Manufacturer of sustainable infrastructure products for clean mobility and energy solutions | $116M | 39 mo ago | 131 | Desmond Wheatley President & CEO | WordPressMySQLPHP+27 | 82 patents Advanced thermal management and rapid low‑temp charging for EV battery packs. | 1 expansion |
| 4 | Halcyon Provider of AI-assisted search and information platform for energy professionals 45Funding top 25%Talent top 38%Patents top 39%Innovation top 42% All 7 signals ▾Fundingtop 25% Talenttop 38% Patentstop 39% Innovationtop 42% Techbottom 46% Marketbottom 37% Globalbottom 35% Funding: Raised $31.8M across 2 rounds · 2 rounds over 2 yrs (1.0/yr) Talent: 2 named leaders on record · 2 C-suite/founder profiles curated rank vs industry peers · Fliar Intelligence Index 45/100 | $32M | 3 mo ago | — | Bruce F Founder & CEO | HubSpot CMS Hubcore-jsPreact+15 | 13 patents Patents concentrated in transport & manufacturing processes | — |
| 5 | Figtree Financing PACE financing provider for property owners. | $30M | 122 mo ago | 152 | — | — | — | — |
| 6 | Endera Developer of comprehensive commercial electric shuttles and telematics software solutions | $27M | 16 mo ago | 58 | John Walsh Founder & CEO | Squarespace CommerceSquarespaceTypeScript+28 | 7 patents EV thermal management, chassis integration, and in‑vehicle health/facial recognition diagnostics | — |
| 7 | ISE Corporation Domain expired; Sedo parking page with domain renewal and WHOIS tools | $23M | 203 mo ago | 59 | — | — | 113 patents Hybrid vehicle energy storage management and remote diagnostic telematics systems | — |
| 8 | CleanSpark Provider of microgrid optimizer software solutions 74Funding top 28%Fin. health top 28%Growth top 29%Market top 30% All 13 signals ▾Fundingtop 28% Fin. healthtop 28% Growthtop 29% Markettop 30% Moattop 31% Producttop 32% Talenttop 36% Techtop 37% Partnerstop 37% Newstop 38% Innovationbottom 39% Patentsbottom 33% Globalbottom 33% Funding: Raised $20.0M · 3 rounds over 7 yrs (0.4/yr) Fin. health: Revenue ~$766M (FY2021) · Net margin -42416.8% rank vs industry peers · Fliar Intelligence Index 74/100 | $20M | 7 mo ago | 130 | Zachary Bradford CEO & President | WordPressMySQLPHP+22 | 6 patents Communication and power‑sharing networks for distributed energy generation and storage systems | — |
| 9 | Xendee Provider of software for microgrid design, modeling, and operation services | $20M | 48 mo ago | 10 10 → 25 (+150%) | Scott Mitchell Co-Founder | HubSpot CMS HubMaterial Design Litecore-js+13 | 22 patents AI-powered planning and optimization of microgrids and distributed energy resources | — |
| 10 | Ivy Energy Cloud-based platform offering bill calculation software solutions for solar energy operators | $18M | 26 mo ago | 38 38 → 50 (+32%) | Dover J Founder & CEO | Apple iCloud MailGoogle WorkspaceRadix UI+16 | — | — |
| 11 | GroundMetrics Survey and monitoring services for oil and gas companies | $18M | 82 mo ago | 8 | — | — | 105 patents Electromagnetic subsurface and borehole surveying for resistivity and fracture mapping | — |
| 12 | South 8 Liquefied gas electrolyte for lithium ion batteries 29Talent top 28%Moat top 39%Funding top 40%Global bottom 45% All 5 signals ▾Talenttop 28% Moattop 39% Fundingtop 40% Globalbottom 45% Marketbottom 28% Talent: 3 named leaders on record · 3 C-suite/founder profiles curated Moat: Editorial + unicorn rating 6/10 · 9 curated direct competitors tracked rank vs industry peers · Fliar Intelligence Index 29/100 | $12M | 2 mo ago | 21 21 → 46 (+119%) | Jungwoo Lee Co-Founder & Chief Technology Officer | — | — | 1 job opening |
| 13 | Ocean NanoTech Provider of dispensable quantum dots | $11M | 84 mo ago | 6 | Andrew Wang CEO & President | — | — | — |
| 14 | Rhombus Energy Solutions Power Management and Energy Storage solutions developer | $11M | 50 mo ago | 41 | Parthiv Patel Co-Founder | — | — | — |
| 15 | Kitu Systems Native grid-edge technology leader simplifying Distributed Energy Resource Management | $9M | 146 mo ago | 43 | — | — | — | 1 launch · 1 expansion |
| 16 | Sonocharge Energy Developer of battery technology | $8M | 16 mo ago | — | Haodong Liu Co-Founder & CTO | WebflowMicrosoft 365jsDelivr+8 | — | — |
| 17 | BlueDot Modern furniture for every room: design, quality, and sustainability | $5M | 156 mo ago | 4 | — | — | 15 patents Automotive wheel valve mounts and tire tread sensors; genomic metagenomic analysis and sequencing barcoding | — |
| 18 | Agnetix Developer of water-cooled LED horticulture lighting systems with integrated data visibility | $5M | 64 mo ago | 20 | Ihor Lys Co-Founder & CTO | WordPressMySQLPHP+21 | 85 patents Patents concentrated in health & consumer products | — |
| 19 | 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 | — |
| 20 | Bodi Energy Provider of security services including guarding, patrol, and security consulting | $4M | 108 mo ago | 17 | Yong Joo Co-Founder | — | — | — |
| 21 | Ocean Aero Provider of an AUV for surface and subsurface monitoring applications | $4M | 5 mo ago | 50 | Kevin Decker CEO | Cart FunctionalitySquarespace CommerceSquarespace+15 | 24 patents Advanced autonomous marine navigation and adaptive propulsion/wing systems for vessels | — |
| 22 | VECKTA Cloud-based microgrid turnkey control solutions provider | $3M | 47 mo ago | 20 | Tristan Jackson Co-Founder & CSO | Node.jsGoogle MapsTailwind CSS+20 | — | — |
| 23 | UCAP Power Provider of solutions for ultra capacitor based energy storage system | $2M | 16 mo ago | 120 | — | WordPress Block EditorWordPressMySQL+20 | — | — |
| 24 | Anacove Provider of energy management solutions for hotels | $2M | 48 mo ago | 4 | — | HighchartsW3.CSSAngular Material+15 | 6 patents IoT-enabled facility management and occupancy sensing using smart power cords and sensor networks | — |
| 25 | 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 | — |
| 26 | Luminia Commercial property solar & sustainability financing solutions | $1M | 80 mo ago | 23 | — | WordPressMySQLPHP+34 | — | — |
| 27 | TyFast Provider of electric vehicle charging solutions | $1M | 23 mo ago | 8 | Haodong Liu Co-Founder | WixSentryBootstrap+8 | 17 patents Advanced lithium‑ion anode chemistries and solid‑state battery manufacturing processes | 1 partnership · 1 award |
| 28 | KULR Technology Developer of battery safety and thermal management solutions for various applications | $1M | 65 mo ago | 57 57 → 62 (+9%) | Timothy Knowles Co-Founder & CTO | — | 2 patents Carbon‑fiber heat exchangers for high‑temperature thermal management. | 1 partnership |
| 29 | igrenEnergi Platform offering intelligent battery management systems for electric vehicles and energy storage | $1M | 89 mo ago | 15 15 → 25 (+67%) | Hemanshu Bhatt Co-Founder | — | 11 patents Battery pack power balancing and DC‑DC conversion for distributed energy sources | — |
| 30 | New Leaf Biofuel Manufactures Biodiesel from used vegetable oil | $979K | 168 mo ago | 28 | — | — | — | — |
| 31 | Iteros Cloud based DER and microgrid control software | $830K | 93 mo ago | 8 | — | — | 2 patents Distributed mesh energy system power sharing and coordination | — |
| 32 | Conectric Provider of sensor and software gateways used in utility sub-metering | $716K | 126 mo ago | 9 | Phillip Kopp CEO and Co-Founder | — | 25 patents Wireless sensor networks for adaptive building energy monitoring and control | — |
| 33 | ChangeAerial Provides tools and services for using aerial pictures in automated change detection analyses | $275K | 23 mo ago | — | Andrea Sotgiu Co-Founder | — | — | — |
| 34 | Solenica Designed a designer robot that brings natural illumination in home | $120K | 111 mo ago | 6 | Alessio Paoletti Founder & Product Dev. & Industrial Designer | — | 7 patents Residential solar tracking mirrors (heliostats) for home energy concentration | — |
| 35 | PI Energy Developer of cost-disruptive, waferless solar photovoltaic materials for rooftop installations | $101K | 25 mo ago | 5 | Phil Layton Founder & CEO | — | 1,199 patents Advanced power generation, fluid control, and uranium processing for oil/gas and nuclear sectors | — |
Top 12 Energy Tech companies in San Diego
#1
Acquired · San Diego, California · founded 2006 · 122 employees$184Mraised▾
Wildcat Discovery Technologies is a developer of advanced materials for rechargeable and primary batteries. It is also involved in the development of gas storage, carbon capture, thermoelectrics, and structural materials. It provides a technology platform for hydrogen storage, industrial gas separation, and custom synthesis. It provides electrolyte additives as its product which has been licensed.
- Oct 2025Series D$4.9M
- Jul 2022Series D$90M
- Nov 2021Series D$50M
- Oct 2019Series C$20.5M
#2
Series A · San Diego, California · founded 2021$31.8Mraised▾
Provider of AI-assisted search and information platform for energy professionals. The platform helps users discover new sources and understand shifting market dynamics. It enables users to answer complex questions related to the energy transition. The platform offers dynamically updated datasets collated from authoritative sources. It also provides alerts and search functionalities for energy dockets, documents, and filings.
- Feb 2026Series A$21M
- Apr 2024Seed$10.8M
#3
Series B · San Diego, California · founded 2013 · 21 employees$12Mraised▾
Liquefied gas electrolyte for lithium ion batteries. It provides LiGas technology solution which is a proprietary blend of non toxic and non corrosive gasses. Its features include reduced fire risk, fast charge, low temperature performance, and manufacturability.
- Apr 2026Grant (prize money)$9.2M
- Dec 2025Series B$11M
- May 2024Series A—
- Aug 2023Series A—
#4
Acquired · San Diego, California · founded 2008 · 130 employees$20Mraised▾
Provider of microgrid optimizer software solutions. The software mVSO provides solutions for energy security, sustainability, and revenue generation. It also provides big data analysis solutions for the utilities. Its other offerings include mPulse - for integration and optimization of multiple energy sources, Switchgear - for providing a variety of operating modes, and more.
#5
Series D · San Diego, California · founded 2012 · 50 employees$4Mraised▾
Provider of an AUV for surface and subsurface monitoring applications. The vehicle is self-powered by solar rechargeable lithium batteries and can carry payloads. It is compatible with sensors for weather, dissolved oxygen, acoustic modems, magnetometer, directional drilling, satellite communications, seismic survey, and hydrocarbon detection. It can serve as persistent ISR and cross-communication gateway for critical air, surface, and subsurface applications.
- Jan 2026Series D—
- Sep 2022Series C$4M
- Jul 2021Series C—
- Aug 2018Series B—
#6
Series C · San Diego, California · founded 2018 · 58 employees$26.6Mraised▾
Developer of comprehensive commercial electric shuttles and telematics software solutions. The company develops various models of B series, O series, L series, and D series with features like Nickel manganese cobalt oxide battery, DC fast charging, lightweight composite body, etc. Also, it offers telematics software for fleet intelligence and analytics. It also develops DC Slimline Charger 50kW and DC Wallbox Charger 25kW for fleet charging.
- Feb 2025Series C$36M
- Feb 2025Conventional Debt$13M
- Apr 2024Series C$35.5M
- Aug 2022Series B$20.4M
#7
Funding Raised · San Diego, California · founded 2009 · 12 employees$4.6Mraised▾
HPC experts providing performance analysis and optimization software and services. The company delivers industry-leading expertise and software for application-focused performance analysis of cutting-edge supercomputer systems. Dedicated to helping clients understand application performance, make informed HPC procurement decisions, and maximize the efficiency of existing HPC resources. They offer HPC code modernization and optimization, cloud migration services, and performance profiling tools. SimplifyHPC streamlines computational chemistry workflows. They provide HPC procurement support, cloud HPC solutions, and HPC code services. The company develops software tools for application-focused performance prediction and energy management of high-performance computing systems. They specialize in high-performance computing, performance prediction, energy-efficient computing, software development, and computer systems research.
- Mar 2025Grant (prize money)$1.9M
- Feb 2021Grant (prize money)$1.9M
- Feb 2020Grant (prize money)$191.6K
- Feb 2017Grant (prize money)$225.7K
#8
Series B · San Diego, California · founded 2022$8.5Mraised▾
Developer of battery technology. They claim it develop rechargeable,energy density and long duration batteries. It uses acoustic wave technique for developing batteries.
- Jan 2025Series B$23.5M
- Jun 2024Series A$8.5M
#9
Public · San Diego, California · founded 2006 · 131 employees$115.8Mraised▾
Manufacturer of sustainable infrastructure products for clean mobility and energy solutions. The company produces patented products for the electrification of transportation. Product lines include sustainable electric vehicle charging solutions and vital energy infrastructure products. The company also offers custom batteries with super safety features.
- Mar 2023Conventional Debt$100M
- Jan 2018Post IPO$2.5M
- Sep 2017Conventional Debt$1.5M
- Sep 2017Post IPO$3M
#10
Series B · San Diego, California · founded 2019 · 120 employees$2.5Mraised▾
UCAP Power provides ultra capacitor-based energy storage solutions. Its products include activated carbon derived from the source, EDLC ultracapacitor cell, and UCAP module system.
- Jan 2025Series B$4.8M
- Jan 2023Series A—
- Aug 2021Series A$2.5M
- Jul 2021Seed—
#11
Funding Raised · San Diego, California · founded 2019$1.3Mraised▾
Provider of AI-based structural analysis solutions. Its offerings include IoT sensors and AI-based data analytics software. It enables real-time building and structural condition remotely and automatically by analyzing natural structural vibrations collected by its sensors.
- Apr 2025Grant (prize money)$992.5K
- Sep 2022Grant (prize money)$276K
#12
Series A · San Diego, California · founded 2012 · 38 employees$18Mraised▾
Cloud-based platform offering bill calculation software solutions for solar energy operators. The platform compares resident behavior using proprietary algorithms to equitably distribute the benefits of solar, based on real-time usage, solar availability, and avoided utility cost.
- Apr 2024Series A$18M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Grid Energy Storage is moving in the United States
A read on the academic research around Grid Energy Storage — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 5,941 United States-affiliated papers.
- Electric Power Research Institute204
- Pacific Northwest National Laboratory202
- Argonne National Laboratory193
- Northeastern University151
- Massachusetts Institute of Technology124
- Battery (electricity)57→359
- Electrolyte37→318
- Electrochemistry30→240
- Cathode32→224
- Anode37→209
- Renewable energy40→492
- Battery (electricity)59→507
- Power (physics)8→227
- Electrolyte27→244
- Electrochemistry37→240
- Battery (electricity)35→184
- Renewable energy24→156
- Electrolyte13→114
- Electrochemistry10→80
- Cathode9→72
Where energy storage is researched across United States
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing energy storage patents in the United States
United States energy storage patent filing is accelerating — 8,522 filings from 3,681 assignees (2016–2025), led by General Electric, ESS Technology, GM Global TECH Operations; annual filings 687→1058.
- General Electric592
- ESS Technology276
- GM Global TECH Operations233
- Fastcap Systems205
- UNIV California180
- Rondo Energy157
- United Technologies154
- Battelle Memorial Institute146
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.