Best Energy Companies in Washington, DC, United States
The 55 best Energy companies in Washington, DC, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Evergreen Solar.
Our analysis of 171 Energy companies
$71.4b in tracked funding; 82% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy companies in Washington, DC
| # | Company | Last round | Disclosed funding | Employees | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | AFPM Manufacturers of fuel and liquid petroleum | — | — | 43 43 → 96 (+123%) | 1902 | DrupalApple iCloud MailMicrosoft 365+29 | — | — |
| 2 | API Provider of oil and natural gas training | — | — | 7 | 1919 | SitecoreFacebook LoginMicrosoft ASP.NET+29 | 391 patents Patents concentrated in chemistry & materials | 1 launch |
| 3 | Atlas Energy Technologies Waste to energy biomass plants developer | — | — | — | 2008 | — | — | — |
| 4 | AWWI Developer of wind energy projects | — | — | 25 | 2008 | — | — | — |
| 5 | Cadeo Clean energy consulting firm specializing in transforming energy generation and use through policy, markets… | — | — | 49 | 2014 | — | — | — |
| 6 | Capital Biodiesel Producer of biodiesel from used cooking oils | — | — | — | 2010 | — | — | — |
| 7 | CLNG Organization promoting the use of liquefied natural gas for shipping and storage | — | — | 8 | 2004 | WordPressMySQLPHP+21 | — | 1 expansion |
| 8 | Consent Energy Engineering and Design solutions provider | — | — | — | 2013 | — | — | — |
Top 12 Energy companies in Washington, DC
#1
Series B · Washington, DC, District of Columbia · founded 2023 · 14 employees$27.1Mraised▾
Provider of clean energy training and consulting services
- May 2026Conventional Debt$500M
- Apr 2025Series B$50M
- Jan 2024Series A$18.2M
- Jun 2023Seed$4.2M
#2
Series C · Washington, DC, District of Columbia · founded 2019 · 45 employees$64Mraised▾
Developer of small modular reactor
- Dec 2025Series C$100M
- Aug 2024Series B$40M
- 2021Series A$21M
- 2019Seed$3M
#3
Funding Raised · Washington, DC, District of Columbia · founded 2009 · 39 employees$22.6Mraised▾
Building community power through clean energy and resilience solutions. The organization focuses on increasing local resilience and cutting electricity bills for communities. They achieve this through community solar projects, resilience hubs, and residential energy efficiency programs. These initiatives aim to preserve affordable housing, strengthen the grid, and support local economic development. The organization leverages a data platform and ethical AI to connect people with projects, delivering sustainable results. They serve rural, small-town, and urban communities, tailoring programs to local priorities. Their work includes home safety and efficiency upgrades, workforce training, and small business support. They partner with local utilities, nonprofits, and churches to deliver energy solutions. The organization's initiatives promote social impact by empowering communities and ensuring energy affordability. They use data and AI to simplify enrollment in energy programs.
- May 2025Grant (prize money)$729.4K
- May 2025Grant (prize money)$20M
- Feb 2025Grant (prize money)$729.4K
- Feb 2025Grant (prize money)$1.2M
#4
Series B · Washington, DC, District of Columbia · founded 2015 · 39 employees$20Mraised▾
Developer of nuclear energy projects
- Jan 2025Series B$53.8M
- Apr 2022Series A$20M
#5
Series D · Washington, DC, District of Columbia · founded 2017 · 96 employees$175Mraised▾
Summit Ridge develops and finances solar power plants across the United States. The company develops multiple forms of plants, both grid connected as well as off grid and energy storage backed systems. The company primarily sets up solar power plants for commercial and public sector organisations. The team consists of Ex-SunEdison employees.
- Jul 2022Series D$175M
- Jun 2022Conventional Debt—
- Jun 2017Seed—
#6
Public · Washington, DC, District of Columbia · founded 1994 · 174 employees$449.5Mraised▾
Unbiased solar guidance, connecting homeowners with the best solar solutions. We are a non-profit organization dedicated to educating homeowners and businesses about the economic and environmental advantages of photovoltaic solar energy. Our mission is to accelerate solar panel adoption across homes, schools, and businesses. We connect homeowners with top manufacturers, suppliers, equipment, and installers, promoting both national and local brands. A nationwide directory of vetted installers is being developed, ranked by feedback from city inspectors, utility companies, the Better Business Bureau, and customer surveys. We are supported by grants and offer scholarships and classroom grants. Job opportunities are available for solar enthusiasts, including remote work options with modern communication tools. We seek marketers, copywriters, and subject matter experts. Our work has a social impact by promoting clean energy and environmental sustainability.
- Apr 2010Post IPO$165M
- Jun 2005Post IPO$75M
- Jun 2005Post IPO$90M
- Mar 2003Post IPO$29.5M
#7
Seed · Washington, DC, District of Columbia · founded 2021 · 11 employees$14.1Mraised▾
Startup focused on revolutionizing the energy landscape through its nuclear waste recycling process. The company has developed a chemical process to convert nuclear waste into usable products, such as fuel for advanced nuclear reactors.
- Apr 2024Seed$14M
- Aug 2023Seed$100K
#8
Series C · Washington, DC, District of Columbia · founded 2016 · 53 employees$40Mraised▾
Developer of solar energy projects
- May 2020Series C$40M
#9
Series A · Washington, DC, District of Columbia$7.7Mraised▾
Manufacturer of electric utility
#10
Seed · Washington, DC, District of Columbia · founded 2021$2.5Mraised▾
Solar energy company provides financial products for residential and commercial solar development. It partners with solar developers by providing financial solutions to facilitate solar projects. The company focuses on removing financial obstacles in solar development, offering specialized financial products and streamlined payment processes. The company aims to build sustainable, long-term partnerships with solar development companies.
- Apr 2023Seed$2.5M
#11
Acquired · Washington, DC, District of Columbia · founded 2011 · 154 employees$16.6Mraised▾
Renewable energy provider offering clean electricity solutions for a sustainable future. The company supplies % renewable energy from regional wind and solar farms, empowering individuals and businesses to reduce their carbon footprint without installations or changes to their utility provider. They build clean energy projects and are committed to creating a better environment for future generations. The company offers a seamless way to contribute to a clean energy future with dedicated customer care and growing climate solutions. They are focused on making clean air and renewable energy available to all. The company provides clean electricity products and generation services. They are committed to caring for their customers, their people, and the planet. The company is focused on social impact by providing renewable energy and fighting climate change. They offer subscription services for clean energy.
- Jan 2014Series A$12M
- Jul 2013Series A$2.1M
- Dec 2012Series A$2.4M
#12
Series A · Washington, DC, District of Columbia · founded 2008$10Mraised▾
Empowering communities with resilient energy systems and innovative solutions. The organization builds local energy prosperity through microgrid electricity, clean cooking initiatives, and advisory services. They pioneer smart, local electricity systems, fostering community engagement and sustainable development. Their work involves innovation, research, and business partnerships to overcome barriers to energy access. They focus on building resilient local energy systems using modern technologies and business models to deliver affordable, reliable electricity. They develop technology solutions, including smart metering, billing, and grid analytics software and hardware. The organization is dedicated to solving energy poverty and promoting renewable energy solutions, creating a positive social impact.
- May 2020Series A$10M
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
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
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.