Best Solar Energy Companies in San Francisco, United States
The 49 best Solar Energy companies in San Francisco, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Recurrent Energy.
Our analysis of 50 Solar Energy companies
$17.8b in tracked funding; 84% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Solar Energy companies in San Francisco
| # | Company | Disclosed funding | Last round | Employees | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | Recurrent Energy Developer of utility-scale solar projects 74Funding top 24%Tech top 28%Growth top 35%Product top 37% All 10 signals ▾Fundingtop 24% Techtop 28% Growthtop 35% Producttop 37% Newstop 38% Innovationtop 40% Partnerstop 42% Moattop 48% Marketbottom 48% Globalbottom 39% Funding: Raised $585M across 9 rounds · 9 rounds over 19 yrs (0.5/yr) Tech: 42 technologies across 5/8 capability areas · Cloud: Amazon S3, Amazon Web Services rank vs industry peers · Fliar Intelligence Index 74/100 | $585M | 15 mo ago | 110 | — | WordPressApple iCloud MailMySQL+26 | — | — |
| 2 | Longroad Energy Developer of utility-scale wind and solar power projects 53Talent top 38%Innovation top 40%Product top 40%Funding top 41% All 10 signals ▾Talenttop 38% Innovationtop 40% Producttop 40% Fundingtop 41% Techtop 44% Growthtop 45% Moattop 48% Marketbottom 44% Globalbottom 39% Newsbottom 24% Talent: 2 named leaders on record · 2 C-suite/founder profiles curated Innovation: 2 product lines rank vs industry peers · Fliar Intelligence Index 53/100 | $500M | 32 mo ago | 153 153 → 232 (+52%) | Michael Alvarez Co-Founder and COO | WordPress Block EditorWordPressApple iCloud Mail+33 | — | 1 internship |
| 3 | Sunrun Provider of solar energy services for residential | $297M | 105 mo ago | 8,360 8,360 → 10,543 (+26%) | Mary Powell CEO | Apple iCloud MailGoogle WorkspaceNode.js+32 | 54 patents Solar panel mounting hardware and integrated tracking/fastening systems | 3 partnerships · 1 award |
| 4 | Pattern Energy Group Renewable Energy focused IPP 76Innovation top 20%Funding top 26%Product top 26%Fin. health top 29% All 10 signals ▾Innovationtop 20% Fundingtop 26% Producttop 26% Fin. healthtop 29% Markettop 36% Growthtop 45% Techtop 48% Moattop 48% Newsbottom 38% Globalbottom 37% Innovation: 5 product lines Funding: Raised $256M across 1 rounds · 1 rounds over 8 yrs (0.1/yr) rank vs industry peers · Fliar Intelligence Index 76/100 | $256M | 14 mo ago | 491 | — | WordPress Block EditorWordPressApple iCloud Mail+22 | — | — |
| 5 | Spruce Provider of solar financing services for residential units | $205M | 87 mo ago | 140 | — | — | 5 patents Secure proximity authentication, portable pet furniture, and DVD/web media authoring technologies. | 1 job opening |
| 6 | Mission Clean Energy Developer of solar energy projects 62Funding top 35%Talent bottom 49%Global bottom 48% All 3 signals ▾Fundingtop 35% Talentbottom 49% Globalbottom 48% Funding: Raised $55.0M across 1 rounds · 1 rounds over 1 yrs (1.0/yr) Talent: 1 named leader on record · 1 C-suite/founder profile curated rank vs industry peers · Fliar Intelligence Index 62/100 | $55M | 16 mo ago | 31 | Max Bakker CEO | — | — | 1 job opening |
| 7 | Renewable Properties Financial advisory for solar projects development | $45M | 70 mo ago | 33 | — | Webflow EcommerceWebflowLeaflet+16 | — | 2 job openings · 1 expansion |
| 8 | ECOtality Retailer of solar products, energy efficient products, and buying guides | $41M | 157 mo ago | 29 | Don Karner Co-Founder | WordPressMySQLPHP+19 | 16 patents EV charging hardware and control systems for multi-vehicle power transfer. | — |
| 9 | Sparq Innovative microinverter technology transforming solar energy with efficiency, reliability, and… | $14M | 141 mo ago | 1 | Praveen Jain CEO and Director of Board | WordPressMySQLPHP+13 | 8 patents Wearable safety alerts and performance sensors for emergency response and athletic monitoring | — |
| 10 | Ulltrasolar Technology Enhancing solar power plant performance with innovative QuantumBoost technology | $13M | 62 mo ago | 11 | Santosh Kumar Founder and CEO | — | — | — |
| 11 | 3Degrees Energy Services Company | $10M | 48 mo ago | 255 | Dan Kalafatas Co-Founder | WordPressApple iCloud MailGoogle Workspace+25 | 5 patents Linked database integration platforms and social network analysis tools | 2 launchs |
| 12 | Aether Energy Provider of an AI-powered platform for solar and roofing installers | $3M | 21 mo ago | — | Shelby Bons Co-Founder & CTO | SentryNode.jsThree.js+16 | — | — |
| 13 | Nuance Energy Solar racking solutions and project installers | $3M | 109 mo ago | 14 | — | WordPressMySQLPHP+32 | — | — |
| 14 | Plant PV Technology for improving solar panel efficiency | $2M | 133 mo ago | 5 | — | — | 192 patents Development of novel ornamental petunia, calibrachoa, and salvia cultivars | — |
| 15 | Noria Energy Developer of solar energy projects 19Talent top 38%Funding bottom 39%Global bottom 29%Market bottom 28% All 4 signals ▾Talenttop 38% Fundingbottom 39% Globalbottom 29% Marketbottom 28% Talent: 2 named leaders on record · 2 C-suite/founder profiles curated Funding: Raised $2.1M across 2 rounds · 2 rounds over 4 yrs (0.5/yr) rank vs industry peers · Fliar Intelligence Index 19/100 | $2M | 11 mo ago | 20 | Jairo Criollo Co-Founder | — | — | — |
| 16 | ChargeWheel Provider of EV charging solutions for electric vehicles | $1M | 88 mo ago | 3 | — | Node.jsTailwind CSSReact+9 | — | — |
| 17 | Powertree Services Provider of integrated solar, EV charging, and energy storage solutions | $760K | 158 mo ago | — | Stacey Reineccius CEO | — | 24 patents Adaptive EV charging hardware and grid‑integrated energy management systems | — |
| 18 | SRECTrade Provider of environmental commodity management, transaction, and technology solutions | $500K | 183 mo ago | 54 54 → 27 (-50%) | — | PHPSalesforceamCharts+15 | — | — |
| 19 | Solactron Thin film solar technology company delivering high-efficiency, low-cost solar solutions | $350K | 162 mo ago | 2 | Jehad Abushama Founder & CEO | — | — | — |
| 20 | DirtSat Platform providing satellite data and AI for biosolar and storage | $300K | 37 mo ago | 2 | Christine Tiballi Founder & CEO | — | 4 patents IoT-enabled rooftop farming platforms integrating smart‑city sensor data for precision agriculture | — |
| 21 | SolarGaps Smart solar blinds generating renewable energy and reducing electricity bills | $100K | 86 mo ago | 14 | Yevgen Erik CEO | WordPressMySQLPHP+28 | — | — |
| 22 | CFEX Manufacturer of solar powered products | — | 12 mo ago | 18 | — | — | — | — |
| 23 | Clearway Energy Group Investor, developer and operator of renewable energy plants | — | 47 mo ago | 7 | — | WordPressMySQLPHP+13 | — | 1 award |
Top 12 Solar Energy companies in San Francisco
#1
Acquired · San Francisco, California · founded 2006 · 110 employees$585Mraised▾
Recurrent Energy provides solar power and develops and owns locally-sited solar power systems. The company offers their model via a Power Purchase Agreement (PPA) or Feed-in Tariffs (FiT). In return, their utility, commercial, and government customers achieve energy independence, predictable pricing, and enhanced sustainability.
- Apr 2025Conventional Debt$415M
- Jul 2024Conventional Debt$54.3M
- Apr 2024Conventional Debt$118.2M
- Jan 2024Series C$500M
#2
Acquired · San Francisco, California · founded 2013 · 491 employees$256.1Mraised▾
Pattern Energy is an independent power company focusing on developing wind power resources. The company owns and operates wind power projects in the United States, Canada and Chile. As on Oct 2015, the total owned capacity is 2,282 MW. The company went public on 26 Sep 2013.
- Jun 2025Post IPO—
- Oct 2019Post IPO$256.1M
- Nov 2018Series A—
#3
Acquired · San Francisco, California · founded 2022 · 31 employees$55Mraised▾
Developer of solar energy projects
- Mar 2025Series C$55M
#4
Seed · San Francisco, California · founded 2018 · 20 employees$2.1Mraised▾
Developer of solar energy projects
- Sep 2025Grant (prize money)$978.7K
- Apr 2025Grant (prize money)$1.1M
- Jan 2022Seed—
#5
Series B · San Francisco, California · founded 2016 · 153 employees$500Mraised▾
Developer of utility-scale wind and solar power projects
- Nov 2023Conventional Debt$600M
- Aug 2022Series B$500M
- Jul 2019Series A—
- Oct 2016Series A—
#6
Seed · San Francisco, California · founded 2023$3Mraised▾
Provider of an AI-powered platform for solar and roofing installers. The platform facilitates the design, sales, and payment processes for building installers. It offers solutions for residential solar, commercial solar, and roofing projects. The platform automates residential solar designs, provides shading engine for production estimates, and streamlines deal management. It also provides a building API, CAD engine, deal pipeline management, analytics, and proposal editing capabilities. The aim is to simplify operations with a single application for solar and roofing installers.
- Oct 2024Seed$2.5M
- 2024Seed$500K
#7
Public · San Francisco, California · founded 2007 · 8360 employees$297Mraised▾
Provider of solar energy services for residential
- Oct 2017Conventional Debt$244.5M
- Jul 2016Conventional Debt$33M
- Jun 2016Conventional Debt$40M
- Jan 2016Conventional Debt$250M
#8
Acquired · San Francisco, California · founded 2015 · 140 employees$205Mraised▾
Provider of solar financing services for residential units
- May 2019Conventional Debt$208M
- Jun 2017Series D$25M
- Dec 2016Conventional Debt$105.4M
- May 2016Conventional Debt$120M
#9
Series B · San Francisco, California · founded 2007 · 255 employees$10Mraised▾
3degrees provide clean energy services including PPAs, RECs, community solar and carbon offsets to organisations looking to meet sustainability goals. The company is primarily an energy and climate consulting services provider that offers various products and solutions such as consulting services, RECs, Community Solar support, carbon offsetting services, green power programs and other clean energy marketing and outreach support.
- Aug 2022Series B$4M
- Feb 2020Series A$1M
- Jun 2018Series A$237.7K
- Mar 2017Series A$1.5M
#10
Series B · San Francisco, California · founded 2017 · 33 employees$45Mraised▾
Renewable Properties provides financial advisory for solar projects development. It helps its clients with various stages of solar project development such as site selection, construction contracts, power purchase agreements etc. Performs the due diligence and evaluation of the projects. Once the project is live, it provides operational asset optimization services like financial reporting, project-level monitoring and preventative maintenance. Also handles financial reporting and accounting for the project.
- Sep 2020Series B$30M
- Feb 2018Series A$12.5M
- Jan 2018Seed$2.5M
- Jan 2018Conventional Debt—
#11
Public · San Francisco, California · founded 1989 · 29 employees$41.2Mraised▾
Retailer of solar products, energy efficient products, and buying guides. The entity provides information regarding solar generators, solar panel kits, and solar power banks. It offers product reviews and how-to guides related to solar technology. The entity participates in affiliate advertising programs, earning commissions from qualifying purchases.
- Jun 2013Series B$8.2M
- Mar 2012Series B$5M
- Jan 2011Series B$10M
- Nov 2009Series A$15.5M
#12
Series A · San Francisco, California · founded 2010 · 11 employees$13.3Mraised▾
Enhancing solar power plant performance with innovative QuantumBoost technology. This Californian startup specializes in improving solar energy system efficiency and power output. They offer a reliable product that boosts photovoltaic panel performance, leading to increased revenue and profitability. Their solution provides a cost-effective way to enhance solar farm investments, reducing the levelized cost of energy. They focus on research and development, field trials, and collaboration with research institutions to deliver cutting-edge technology for the solar industry. Their innovative approach aims to maximize energy production from solar installations.
- Jun 2021Series A$9M
- Oct 2011Series A$4.3M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Solar Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Solar Photovoltaics is moving in the United States
A read on the academic research around Solar Photovoltaics — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 4,925 United States-affiliated papers.
- National Laboratory of the Rockies258
- National Renewable Energy Laboratory143
- Stanford University111
- Massachusetts Institute of Technology99
- Purdue University West Lafayette97
- Photovoltaic system44→239
- Solar energy26→202
- Renewable energy11→117
- Perovskite (structure)34→124
- Solar cell87→133
- Solar energy32→595
- Photovoltaic system72→593
- Renewable energy13→383
- Solar cell113→259
- Thermal3→116
- Solar energy16→204
- Photovoltaic system22→151
- Renewable energy11→126
- Solar power1→36
- Perovskite (structure)10→43
Where solar pv 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 solar pv patents in the United States
United States solar pv patent filing is cooling — 38,279 filings from 8,000 assignees (2016–2025), led by Sunpower, IBM, DU PONT; annual filings 4713→2618.
- Sunpower2948
- IBM2063
- DU PONT1694
- General Electric1511
- Universal Display1493
- Applied Materials1230
- First Solar1191
- 3M Innovative Properties920