Top Climate tech companies in Denver

Companies decarbonising power, transport, agriculture, and industry. Filtered to companies headquartered in Denver.

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Ranked by current headcount across Climate tech companies headquartered in Denver. Refreshed daily.

1
HPC Industrial powered by Clean Harbors· Deer Park, Texas, United States
- 995 employees
2
HydroChemPSC· Deer Park, Texas, United States
HPC Industrial, a Clean Harbors business, is the leading provider of specialty maintenance services and technology solutions to the critical energy infrastructure in the United States. HPC has built a strong business platform by partnering with clients who value safety, the most modern and productive equipment in the industry, a deep bench of engineering talent and the highest standards for environmental compliance. The heart of our organization comes from our dedicated employees and we are so proud to have the most experienced, best trained professionals in the industry. Our service culture puts us and our clients on the same side of the table, working as partners to transparently identify ways to reduce wastes, costs and liabilities.HPC offers: • The broadest national footprint • The deepest technical bench • Longest track record in the industryFor more information about HPC, call 800-934-9376 or visit www.hpc-industrial.com. Let's get social. Visit us here: https://www.facebook.com/HydroChemPSChttps://www.twitter.com/HydroChemPSChttps://www.youtube.com/channel/UCXzx5_WO_CcD_QgofIapPMQ
- 715 employees
- Founded 1977
3
IDE Technologies· Kadima - Zoran, Center District, Israel
A world leader in water treatment solutions, IDE specializes in the development, engineering, construction and operation of enhanced desalination and industrial water treatment plants.IDE believes in partnership with customers. Partnership is about applying nearly 60 years of ground-breaking advances in water treatment technologies to serve your needs. Partnership is about delivering projects on schedule, within budget and above specifications, while adhering to strict health, safety and environmental regulations. Partnership is about bringing added value in technological innovation by highly committed people. IDE works with our partners to deliver full satisfaction.
- 632 employees
- Founded 1965
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4
HydroChem LLC· Deer Park, Texas, United States
Technology. Safety. Results.Recognized as a true innovator of safety and performance technologies, HydroChem has been a leader in the industrial cleaning industry for over 70 years. By working closely with plant and maintenance supervisors, our ability to recognize opportunities to improve operator safety, cut process times, and improve productivity, has led to the development of some of the industry’s most sought after technologies.Our motto, Technology, Safety, Results, sums up the platform of our success. Our goal has always been to improve safety through innovation, though we didn’t expect that these safety innovations would lead to such dramatic cost savings for our customers. With that technology, HydroChem gets equipment cleaner (for longer runtimes), and projects get done faster, reducing anticipated outage days. The performance improvement gains alone are enough to create zero cost cleaning for our customers.As a world class supplier, HydroChem offers one of the broadest lines of industrial cleaning processes. Our custom-designed tooling, combined with one of the newest and largest equipment fleets in the industry, enables HydroChem to mobilize unmatched manpower and equipment from coast to coast.While our safety records, mobility, size, resources, and experienced personnel are certainly key factors to our success, it is our dedication to exceeding your expectations that continues to mark our course for the future.
- 488 employees
- Founded 1938
5
Aventia· Denver, Colorado, United States
Aventia is a nationally recognized environmental firm delivering comprehensive consulting, field services, and technology-driven solutions to public and private sector clients in more than 40 states.With over 400 team members, Aventia helps clients navigate complex environmental regulations, implement sustainable solutions, and create healthier communities through collaborative partnerships.
- 422 employees
- Founded 2022

6
Kimble Companies· Dover, Ohio, United States
Our mission is to provide Eastern Ohio residents and businesses outstanding service in refuse and recycling collection in a way that is environmentally conscious, cost efficient and customer centered.Headquartered in Dover, Ohio, Kimble is a family-owned and operated business. We’re committed to providing quality, convenient and sustainable waste management and recycling solutions to Eastern Ohio.We offer municipal, commercial and residential services, and our top priority is always our customers. Innovation and excellence remain the cornerstones of our business, as we continuously search for new and improved ways to provide our customers with the best possible service.At Kimble, community and sustainability are woven into the fabric of our organization. We believe that together, as trusted community partners, we can keep Eastern Ohio a great place to live and work.Our customers are our neighbors. We’re dedicated to providing them with convenient and dependable service with superior customer care that’s rooted in honesty and integrity.For us, being a good neighbor means being an active participant in the community. We’re proud to support events throughout our coverage area by donating services and resources.
- 336 employees
- Founded 1948
7
Delaware Department of Natural Resources and Environmental Control· Dover, Delaware, United States
The Delaware Department of Natural Resources and Environmental Control (DNREC) envisions a Delaware that offers a healthy environment where people embrace a commitment to the protection, enhancement and enjoyment of the environment in their daily lives; where Delawareans’ stewardship of natural resources ensures the sustainability of these resources for the appreciation and enjoyment of future generations; and where people recognize that a healthy environment and a strong economy support one another.
- 323 employees
- Founded 1979
8
LVI Services, Inc.· Denver, Colorado, United States
LVI is ranked as the top demolition contractor in the world by D&Ri since 2007 and top abatement contractor in North America by ENR since 1999. With a national network of offices, we’re ready to serve both public and private sector clients in any environment, from densely urban to isolated and remote. Our focus is simple - lead with safety, build relationships, and deliver quality. The result? An experience our clients describe as exceptional.Key Projects:Superstorm Sandy Disaster ResponsePentagon RenovationsNASA JFK Space Center Launch Complex 39B DemolitionLower Manhattan Deutsche Bank Building DemolitionSuperdome Phase II Disaster ResponseMadison Square Garden RenovationsYankee Stadium DemolitionConsolidated Edison Power Plant DemolitionNASA JFK Space Center Vehicle Assembly Building DismantlementUniversity of Illinois Nuclear Reactor D&DStardust Casino & Hotel DemolitionKaiser Sunset Boulevard Hospital DemolitionCrucible Steel Plant DismantlementSan Francisco Bay Oil Spill Disaster ResponseSmithsonian Institution AbatementLAX, Terminal 6 RenovationsIndustries Served:Government, Power, Nuclear, Industrial Manufacturing, Pharma, Oil & Gas, Commercial, Finance, Education, Healthcare, Hospitality, Retail, and Public Use Facilities.
- 215 employees
- Founded 1986
9
Pro-Vac· Deer Park, Texas, United States
We deliver safe, efficient, and innovative subsurface solutions to support the maintenance and construction of our communities’ critical infrastructure through our expansive fleet and the most talented, highly skilled team in the industry.
- 167 employees
- Founded 2002
10
Spheros Environmental· Denver, Colorado, United States
Environmental insight for complex real-world decisions Spheros Environmental helps clients make clear, defensible decisions in complex environments. We bring together scientists, engineers, and technical specialists across air, water, land, and climate to solve environmental challenges that rarely fit within one discipline. Our teams support public and private sector clients through planning, permitting, implementation, monitoring, compliance, and long-term environmental management. Our work spans air quality, water resources and hydrogeology, climate and sustainability, ecology and natural resources, impact assessment and permitting, environmental compliance, litigation support, and digital solutions. Across these areas, we connect data, science, and practical strategy to help clients understand risk, meet regulatory expectations, and move projects forward with confidence. Spheros works where environmental performance matters: regulated facilities, natural systems, infrastructure and energy projects, water resources, industrial operations, and communities facing changing conditions. We partner closely with clients to bring technical rigor, clear communication, and real-world judgment to decisions that need to stand up to regulatory, operational, and stakeholder scrutiny.
- 145 employees
- Founded 2021

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Find engineers at Climate tech companies in Denver

Denver has long been a hub for Climate tech, and the list above ranks the largest Climate tech companies headquartered there by current headcount, drawn from public LinkedIn and Crunchbase records. With 170 matching companies in Refolk’s index, this is a good map of where the Climate tech talent in Denver lives - useful whether you’re recruiting, partnering, or sizing a market.

The biggest Climate tech companies in Denver tend to be the gravitational centres for specialised talent - senior engineers, ML researchers, applied scientists, designers - while the smaller ones compete on speed, equity, and proximity to founders.

Refolk converts this list into a live search. Ask for “Climate tech engineers in Denver hiring senior staff” or “founders of Climate tech companies in Denver who left in the last 12 months” and Refolk returns a ranked shortlist with the evidence that earned each person a spot.

How this list is built

Refolk pulled Climate tech companies headquartered in Denver from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 10 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 11:04:03 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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