Best Energy Companies in San Diego, United States
The 95 best Energy companies in San Diego, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Sempra Energy.
Our analysis of 441 Energy companies
$135.1b in tracked funding; 76% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy companies in San Diego
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | Sempra Energy Developer of utility projects | $750M | 156 mo ago | 4,774 4,774 → 2,577 (-46%) | 1968 | Jeffrey Martin CEO | — | 1 award |
| 2 | OneRoof Energy Offers residential rooftop services | $330M | 115 mo ago | 33 | 2009 | — | — | — |
| 3 | PowerFlex Provider of renewable energy project development services | $100M | 42 mo ago | 300 | 2017 | — | — | — |
| 4 | PowerGenix Nickel-zinc battery solutions for mission-critical applications, powering a sustainable future | $72M | 141 mo ago | 40 | 2000 | — | 6 patents Nickel‑zinc rechargeable battery production processes and electrolyte formulations. | — |
| 5 | Borrego Solar Solar EPC | $61M | 166 mo ago | 302 302 → 169 (-44%) | 1980 | Chris Anderson Co-Founder | — | — |
| 6 | UpWind Solutions Wind Turbine Operation & Maintenance provider | $50M | 167 mo ago | 310 | 2007 | — | — | — |
| 7 | Pathway Power Developer of solar and wind energy projects | $36M | 19 mo ago | 10 | 2022 | Jared Quient Founder and Managing Partner | — | 2 partnerships |
| 8 | MCPV Manufacturer of heterojunction solar cells and modules for solar energy projects | $11M | 14 mo ago | — | 2020 | Marc Rechter Co-Founder & CEO | — | — |
| 9 | PCN Technology Communication technologies & products | $5M | 164 mo ago | 51 | 2004 | — | 11 patents Patents concentrated in electrical & electronics | — |
| 10 | Osage Exploration Event and tourism promotion with balloons and decorations in Indonesia | $5M | 147 mo ago | 9 | 2004 | Kim Bradford CEO | — | — |
| 11 | Kabe Exploration Exploration and production company | $5M | 157 mo ago | 1 | 2005 | — | — | — |
| 12 | Equal Earth Solar IPP company | $3M | 147 mo ago | 11 | 2011 | Andrew Duggan CEO | — | — |
| 13 | Hyperlight Energy Solar fresnel and CSP technology developer | $2M | 145 mo ago | — | 2007 | — | — | — |
| 14 | Primo Energy Solar panel & products installation company | $2M | 81 mo ago | 8 | 2012 | Hayden Van Zanten Co-Founder | — | — |
| 15 | Luminia Commercial property solar & sustainability financing solutions | $1M | 80 mo ago | 23 | 2018 | — | — | — |
| 16 | Powur Provider of solar energy services for homes | $1M | 122 mo ago | 127 | 2014 | — | — | — |
| 17 | focal point energy Focal Point Energy is the leading manufacturer of solar boilers for commercial and industrial customers in… | $954K | 163 mo ago | 8 | 2007 | — | — | — |
| 18 | Power Efficiency Manufacturer of lighting systems | $935K | 200 mo ago | 12 | 2003 | Steven Strasser CEO | — | — |
| 19 | GreenHouse Provider of energy efficiency solutions and sustainable infrastructure products | $808K | 171 mo ago | — | 2007 | Ngo Chinh CEO | — | — |
| 20 | Uprise Energy Portable wind turbine solutions for clean, low-cost, off-grid power | $750K | 102 mo ago | 14 | 2011 | — | — | — |
| 21 | Oberon Fuels Produce variants of Dimethyl ether( an alternative for biodiesel) | $595K | 69 mo ago | 25 | 2010 | Elliot Anise-Hicks CTO & Co-Founder | — | 1 launch |
| 22 | Cellana Developer of algae-based bioproducts for human health, animal feed, and biofuels | $430K | 143 mo ago | 11 | 2007 | Martin Sabarsky CEO | — | — |
| 23 | ClearlyEnergy Provider of installation services of clean energy products | $350K | 158 mo ago | — | 2012 | Norma Jean Autry Co-Founder | — | — |
| 24 | Gemini Energy Services Wind and solar energy services: maintenance, engineering, and major component support | $200K | 194 mo ago | 120 | 2008 | — | — | — |
| 25 | Icarus Thermal heat absorption and energy production solution for solar PV modules | $170K | 55 mo ago | 10 | 2016 | — | 2 patents Integrated solar PV‑thermal co‑generation systems for combined electricity and heat production | — |
| 26 | CollectiveSun Provider of solar financing and power agreements for nonprofits | $150K | 80 mo ago | 6 | 2011 | — | — | — |
| 27 | Canergy Second generation bioethanol manufacturer | $120K | 170 mo ago | — | 2010 | Tim Brummels Co-Founder | — | — |
| 28 | PI Energy Developer of cost-disruptive, waferless solar photovoltaic materials for rooftop installations | $101K | 25 mo ago | 5 | 2007 | Phil Layton Founder & CEO | 1,199 patents Advanced power generation, fluid control, and uranium processing for oil/gas and nuclear sectors | — |
Top 12 Energy companies in San Diego
#1
Funding Raised · San Diego, California · founded 2020$10.9Mraised▾
Manufacturer of heterojunction solar cells and modules for solar energy projects. It focuses on advancing multi-gigawatt cell and module manufacturing. The company develops advanced manufacturing capacity of HJT cells and modules. It emphasizes sustainability in operations, dedicated to the recyclability and sustainable production of solar cells and modules. The company aims to accelerate innovation in the solar manufacturing landscape, combining technology improvements with industry partnerships and customer collaboration in product design and downstream solutions.
- Apr 2025Grant (prize money)$10.9M
#2
Series C · San Diego, California · founded 2022 · 10 employees$36Mraised▾
Developer of solar and wind energy projects
- Nov 2024Conventional Debt—
- Jan 2024Series C$25M
- Sep 2022Series C$36M
#3
Acquired · San Diego, California · founded 2017 · 300 employees$100Mraised▾
Provider of renewable energy project development services
- Dec 2022Series A$100M
- Sep 2018Grant (prize money)$744K
- Sep 2017Grant (prize money)$150K
- Jul 2017Grant (prize money)$225K
#4
Deadpooled · San Diego, California · founded 2009 · 33 employees$330.2Mraised▾
OneRoof Energy develops and distributes solar energy generation systems. The company also provides solar roofing systems installation and support services. OnRoof Energy has a strategic partnership with Eagle Roofing Products.
- Nov 2016Post IPO$17M
- Jun 2016Venture Debt$50M
- Mar 2016Post IPO$20M
- Dec 2015Venture Debt$20M
#5
Public · San Diego, California · founded 1968 · 4774 employees$750Mraised▾
Sempra Energy is a natural gas utilities holding company. Their products include electric, natural gas and other energy products and services. Its primary competitors are Dominion, Edison and MDU Resources Group. The company has operations worldwide.In 2022, the company recorded annual revenues of $14.43B and a net profit of $2.13B.
#6
Acquired · San Diego, California · founded 2000 · 40 employees$71.6Mraised▾
Nickel-zinc battery solutions for mission-critical applications, powering a sustainable future. The company specializes in nickel-zinc (NiZn) battery technology, offering safe, reliable, and sustainable power solutions. They provide battery energy storage solutions with backward and forward compatibility with megawatt class UPS inverters. Their batteries offer higher power density with no thermal runaway. The company serves various industries including data centers, intelligent transportation, industrial engine starting, information technology, and future markets. They focus on creating battery solutions that are good for business, people, and the planet, emphasizing sustainability and a low carbon footprint. Their patented nickel-zinc electrochemistry ensures safety, reliability, and sustainability. They offer products like BC Series UPS Battery Cabinets, Monobloc Batteries, and Cylindrical Cells. The company is committed to innovation and environmental responsibility, providing immediate power solutions for an always-on world.
- Sep 2014Series E$10M
- Sep 2008Series D$30M
- Feb 2007Series C$17M
- Jun 2004Series B$10M
#7
Series C · San Diego, California · founded 1980 · 302 employees$61.4Mraised▾
Borrego Solar Systems specializes in commercial, residential and public sector turnkey, grid connected solar electric systems. The company has a portfolio of over 1100 solar PV projects and has offices in california, massachusetts and New York, and provides installation and services the USA.
- Aug 2012Series C$17.4M
- Feb 2012Conventional Debt$47M
- Aug 2009Series B$30M
- Feb 2009Series A$14M
#8
Acquired · San Diego, California · founded 2007 · 310 employees$50.3Mraised▾
UpWind Solutions is an independent service provider for O&M services to the wind industry in US. The company's services include maintenance services, parts and logistics capabilities, repairs and upgrades, and warranty services. The company's latest offering UpWind Insight™ uses big data analytics to provide services across the O&M value chain.
- Jul 2012Series B$10M
- Mar 2011Series B$10M
- Mar 2010Series B$28.8M
- 2007Series A$1.5M
#9
Seed · San Diego, California · founded 2007 · 5 employees$101.2Kraised▾
Developer of cost-disruptive, waferless solar photovoltaic materials for rooftop installations. The company focuses on fabricating and improving solar photovoltaic materials. Their technology aims to provide solar PV without government subsidies, avoiding traditional silicon wafer-based manufacturing. After internal testing, the patented technology will undergo third-party testing. This testing is a milestone in their commercialization plan. The company intends to share performance data and production costs with partners and customers. They also plan to establish manufacturing facilities using locally-sourced materials and explore fabrication opportunities. Initial sales will target companies requesting solar modules for large-area rooftop installations.
- Apr 2024Seed$720K
- May 2023Seed$349.9K
- Aug 2022Seed$51.2K
- Jul 2014Grant (prize money)$180K
#10
Deadpooled · San Diego, California · founded 2004 · 9 employees$5.2Mraised▾
Event and tourism promotion with balloons and decorations in Indonesia. They specialize in providing eye-catching promotional solutions for events and tourist destinations. Services include providing balloons for events, promotional campaigns, and decorations. They focus on creating memorable experiences through visually appealing decorations, including balloon arrangements and custom designs. They cater to event organizers and tourism businesses looking to enhance their appeal and attract more attention. They offer balloon promotional items and event decorations. They also provide consultation services to help clients choose the best options for their specific needs.
- Mar 2014Post IPO$5M
- Apr 2011Post IPO$200K
#11
Deadpooled · San Diego, California · founded 2004 · 51 employees$5.2Mraised▾
PCN Technology designs, develops and markets I/O subsystem components that leverage existing energy grids and systems of products, devices, machinery, and installations in order to communicate and network mission critical data. that transform legacy automation and control wiring into high-bandwidth industrial Ethernet infrastructure for factories, buildings, oil & gas, energy & transportation.
- Sep 2012Series A$5.2M
#12
Deadpooled · San Diego, California · founded 2005 · 1 employees$5Mraised▾
Kabe Exploration is an E & P Company. The company is focused on acquiring oil and gas assets, oil and gas exploration, refinery and pipeline sectors of the energy industry. The company carries out its its business in the United States.The website is non functional as of 30 Dec 2015.
- May 2013Seed$5M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
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.