Best Environment Companies in Washington, DC, United States
The 59 best Environment 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 90 Environment companies
$38.2b in tracked funding; 89% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Environment companies in Washington, DC
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Evergreen Solar Unbiased solar guidance, connecting homeowners with the best solar solutions | $449M | 194 mo ago | Public | — | 1994 | WordPressMySQLPHP+10 | 166 patents Manufacturing and processing of crystalline silicon photovoltaic wafers, focusing on growth stability, resistivity uniformity, and | — |
| 2 | Summit Ridge Solar project developers | $175M | 47 mo ago | Series D | Steve Raeder CEO | 2017 | WordPress Block EditorWordPressMySQL+27 | — | 1 job opening · 1 internship · 1 award |
| 3 | Last Energy Developer of small modular reactor 45Funding top 30%Growth top 45%Talent bottom 49%Tech bottom 48% All 7 signals ▾Fundingtop 30% Growthtop 45% Talentbottom 49% Techbottom 48% Globalbottom 39% Marketbottom 36% Newsbottom 36% Funding: Raised $64.0M across 4 rounds · 4 rounds over 7 yrs (0.6/yr) Growth: Web rank 5,000,000 → 10,000,000 YoY · Fresh capital in last 24 mo rank vs industry peers · Fliar Intelligence Index 45/100 | $64M | 6 mo ago | Series C | Bret Kugelmass CEO | 2019 | WebflowGSAPcore-js+15 | — | 1 launch |
| 4 | BTR Energy Provider of EV telematics data analysis and clean fuel program participation services. | $45M | 54 mo ago | Acquired | Jack Barrow CEO | 2015 | — | — | — |
| 5 | New Columbia Solar Developer of solar energy projects | $40M | 73 mo ago | Series C | Michael Healy CEO | 2016 | — | — | — |
| 6 | Groundswell Building community power through clean energy and resilience solutions 42Innovation top 32%Patents top 33%Funding top 41%Product top 46% All 8 signals ▾Innovationtop 32% Patentstop 33% Fundingtop 41% Producttop 46% Talentbottom 49% Techbottom 47% Globalbottom 41% Marketbottom 34% Innovation: 18 patents (top 54% of patent-holders) · 3 filings since 2022 vs 0 in 2017-21 Patents: 18 patents matched (strict assignee match) · 3 filings since 2022 vs 0 in 2017-21 rank vs industry peers · Fliar Intelligence Index 42/100 | $23M | 14 mo ago | Funding Raised | Michelle Moore Chief Executive Officer | 2009 | WordPressMySQLPHP+23 | 18 patents Groundwater monitoring, remediation optimization, and compliance‑constrained predictive analytics | 1 job opening |
| 7 | Zeno Power Developer of nuclear energy projects | $20M | 17 mo ago | Series B | Tyler Bernstein Co-Founder & CEO | 2015 | WebflowProton MailApple iCloud Mail+14 | — | — |
| 8 | CleanChoice Energy Renewable energy provider offering clean electricity solutions for a sustainable future | $17M | 150 mo ago | Acquired | — | 2011 | ContentfulApple iCloud MailGoogle Workspace+35 | — | — |
| 9 | CURIO Startup focused on revolutionizing the energy landscape through its nuclear waste recycling process | $14M | 26 mo ago | Seed | Yehudah Moskowitz Co-Founder & Vice Chairman | 2021 | WordPressApple iCloud MailMySQL+16 | 58 patents Advanced nuclear fuel recycling and molten‑salt reactor technologies, plus AI‑driven video analytics | 1 award |
| 10 | EarthSpark International Empowering communities with resilient energy systems and innovative solutions | $10M | 73 mo ago | Series A | Daniel Schnitzer Founder | 2008 | — | — | — |
| 11 | Nextility Energy Savings Company | $10M | 140 mo ago | Deadpooled | — | 2009 | — | 3 patents Software platforms for automated energy market brokering and trading | — |
| 12 | Cambium Carbon Provider of carbon waste management services 53Talent top 28%Funding top 33%Tech top 39%Growth top 43% All 7 signals ▾Talenttop 28% Fundingtop 33% Techtop 39% Growthtop 43% Globalbottom 37% Marketbottom 29% Newsbottom 22% Talent: 4 named leaders on record · 4 C-suite/founder profiles curated Funding: Raised $8.5M across 3 rounds · 3 rounds over 7 yrs (0.4/yr) rank vs industry peers · Fliar Intelligence Index 53/100 | $8M | 16 mo ago | Series A | Stephan Herrera Co-Founder & CMO | 2019 | StoryblokNode.jsThree.js+13 | — | 1 partnership · 1 expansion · 1 award |
| 13 | Compost Crew Provider of organic waste composting services | $6M | 50 mo ago | Series A | — | 2011 | WordPressMySQLPHP+29 | — | 1 partnership |
| 14 | Kubik Manufacturer of low-carbon plastic waste construction material for construction industry | $5M | 26 mo ago | Seed | — | 2021 | Cart FunctionalitySquarespace CommerceSquarespace+14 | — | — |
| 15 | Energicity Renewable energy utility providing power to off-grid communities in West Africa | $3M | 73 mo ago | Seed | Nicole Poindexter Co-Founder & CEO | 2015 | WordPress Site EditorWordPressMySQL+14 | — | — |
| 16 | Redball Energy Solar energy company provides financial products for residential and commercial solar development | $2M | 38 mo ago | Seed | Nick Giannotti Co-Founder & Chief Investment Officer | 2021 | WebflowCalendlyjQuery+7 | — | — |
| 17 | Resource Monitor Provider of groundwater management services | $2M | 19 mo ago | Series A | Nakul Garg Co-Founder & CTO | 2023 | WebflowGSAPcore-js+19 | — | — |
| 18 | Clean Power Manufacturer of wind and solar equipments | $325K | 187 mo ago | Funding Raised | — | 1990 | WordPressApple iCloud MailMicrosoft 365+27 | 152 patents Patents concentrated in computing, sensing & instrumentation | — |
| 19 | EnviRelation Provider of organic waste composting services | $100K | 189 mo ago | Seed | Walker Lunn Founder | 2006 | — | — | — |
Top 12 Environment companies in Washington, DC
#1
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
#2
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
#3
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
#4
Series A · Washington, DC, District of Columbia · founded 2019 · 21 employees$8.5Mraised▾
Provider of carbon waste management services
- Feb 2025Series A$18.5M
- Nov 2023Seed$5.3M
- Mar 2022Seed$3.2M
- 2019Seed—
#5
Series A · Washington, DC, District of Columbia · founded 2023$1.5Mraised▾
Resource Monitor is a unified hardware and software platform that simplifies groundwater management, offering ultrasonic flow meters for efficient monitoring. It provides modern solutions for fluid measurement anytime, anywhere.
- Nov 2024Series A$3.1M
- Feb 2024Seed$1.5M
#6
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—
#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
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
#9
Seed · Washington, DC, District of Columbia · founded 2021 · 9 employees$5.2Mraised▾
Manufacturer of low-carbon plastic waste construction material for construction industry
- Apr 2024Seed$1.9M
- Dec 2022Seed$3.3M
#10
Acquired · Washington, DC, District of Columbia · founded 2015 · 10 employees$45Mraised▾
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- Dec 2021Series A$45M
#11
Series C · Washington, DC, District of Columbia · founded 2016 · 53 employees$40Mraised▾
Developer of solar energy projects
- May 2020Series C$40M
#12
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
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Environment coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Environmental Monitoring is moving in the United States
A read on the academic research around Environmental Monitoring — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 3,039 United States-affiliated papers.
- United States Geological Survey157
- Cary Institute of Ecosystem Studies112
- Environmental Protection Agency84
- National Research Council79
- National Park Service76
- Software deployment2→31
- Pollution3→27
- Air quality index1→25
- Water quality10→34
- Air pollution3→25
- Air quality index14→60
- Air pollution8→51
- Pollutant4→32
- Sampling (signal processing)14→42
- Water quality23→48
- Human health1→32
- Pollution4→33
- Air quality index6→31
- Pollutant6→28
- Biodiversity1→22
Where environmental monitoring 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 environmental monitoring patents in the United States
United States environmental monitoring patent filing is accelerating — 450 filings from 343 assignees (2016–2025), led by LEEO, Valencell, United Parcel Service; annual filings 47→49.
- LEEO41
- Valencell25
- United Parcel Service21
- Honeywell INT20
- Apple18
- Venturedyne18
- Pillar TECH17
- IND Scient16
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.