Cleantech and Environmental PR Firms: 2026 Agency List

The leading climate and environmental PR firms in 2026 fall into three groups: climate tech specialists such as Redwood, Tigercomm, Silverline and Antenna Group, global network firms with sustainability practices such as Edelman, FleishmanHillard and Brunswick, and environmental advocacy specialists such as Fenton, Spitfire Strategies and Caplan Communications. Pick by client type: startups, large corporates, or nonprofits and policy campaigns.

PwC's State of Climate Tech 2024 report, as summarized by Environment+Energy Leader, put global climate tech investment at $56 billion by the third quarter of 2024, down from $79 billion in late 2023. Estimates vary by source and by how climate tech is defined. The solar, battery storage, EV infrastructure and carbon removal companies in that market still need partners who can handle technical complexity, capital markets and regulatory pressure at once.

Originally published December 2015. Updated October 22, 2026. Related: PR Firms Directory · EPR's Green Public Relations Guide · Oil and Gas Communications Firms.

What are the three types of climate and environmental PR firms?

Climate and environmental PR firms fall into three types, based on the clients they mainly serve. The order of firms inside each group below is not a ranking.

1. Climate tech specialists. Redwood, Tigercomm, Silverline, Antenna Group, The Climate Hub, Greenhouse, M&Co and Mission Driven Strategies, firms where climate, cleantech and energy transition work is the core of the business.
2. Global network firms with sustainability practices. Edelman, FleishmanHillard, Brunswick and Allison+Partners, firms that bring international reach and integrated corporate-reputation capability into the climate category.
3. Environmental advocacy and policy specialists. Fenton, Spitfire Strategies, Caplan Communications and Cerrell, firms built around climate-focused nonprofits, foundations, and policy-driven campaigns.

Which climate PR firm fits which client?

The table matches each firm to the client profile its entry below describes, so a buyer can shortlist by need before reading the full entries.

Which are the best cleantech and clean energy PR agencies?

The best cleantech and clean energy PR agencies are the climate tech specialists in the table above, matched by the technology and client each one serves. The shortlist below follows the client profile each firm's entry describes. It is not a ranking.

• Clean energy developers that need local approval for wind and solar projects: Tigercomm.
• Solar, battery storage, EV charging, grid and sustainable aviation companies: Antenna Group.
• Cleantech and renewable energy clients that need policy expertise: Silverline.
• Renewable natural gas, solar, wind and LNG clients: M&Co.
• Climate tech startups, corporations and investors: Redwood Climate Communications.
• Venture-backed climate tech companies: Mission Driven Strategies.

Large energy companies and corporates that need public affairs reach usually look at the global network firms covered further down, such as FleishmanHillard and Brunswick Group, or at the firms in EPR's oil and gas communications ranking. For the discipline behind the work, including validation, claims substantiation and crisis patterns, read EPR's cleantech PR playbook.

Why is climate PR different from other PR?

Climate communications operates across a broader stakeholder map than most categories, venture capital, technical journalists, environmental NGOs, federal and state regulators, congressional staff, community organizations, institutional investors, and the general public, often simultaneously. The category also requires technical fluency in domains (battery chemistry, grid architecture, carbon accounting, IRA tax credits) that most generalist PR firms have to ramp on for months before they're useful. The specialists below have built that fluency over years.

Which firms are climate tech specialists?

1. Redwood Climate Communications

Redwood is a specialized strategic PR and marketing firm focused exclusively on climate tech, renewable energy, and sustainability. Supports startups, corporations, and investors across solar, battery storage, carbon markets, grid management, applied AI, EV infrastructure, building energy management, geothermal, and the broader climate ecosystem.

2. Tigercomm

Tigercomm is a Vienna, Virginia firm founded by Mike Casey that works with clean energy and clean economy companies. The DesignRush agency directory lists its founding year as 2006. Tigercomm describes itself as the top clean economy communications firm in the U.S. The firm advances marketing, PR, and public affairs for the clean economy, with particular expertise in community engagement strategies that help clean energy developers win the local social license required to permit new wind, solar, and energy infrastructure projects.

3. Silverline

Silverline is a Washington, D.C.-based clean energy public relations agency named to PR News' Agency Elite list for two consecutive years. Silverline blends strategic storytelling, creative execution, and policy expertise across cleantech, renewable energy, and climate clients.

4. Antenna Group

Antenna Group is a leading U.S. cleantech and climate tech PR firm with substantial client work across solar, battery storage, EV charging, sustainable aviation, grid technology, and broader climate technology categories. Originally an SF-based energy tech specialist; expanded substantially through the IRA-driven cleantech boom. See EPR's Antenna Group profile for leadership and history.

5. The Climate Hub

The Climate Hub is a specialist communications agency for energy, resources, and environment, serving climate tech and carbon markets clients with content marketing, messaging, and growth strategy. The firm's team brings deep fluency in energy, resources, and environment, allowing it to skip the months-long onboarding curve that generalist agencies typically require.

6. Greenhouse Communications

Greenhouse is a UK-based fully employee-owned communications agency on a mission to drive positive social and environmental impact. Greenhouse works across energy, transport and food systems, finance, nature, and the built environment.

7. M&Co (Montieth & Company)

M&Co is a New York-based strategic communications firm with substantial energy transition and climate tech experience, clients across renewable natural gas, solar, wind, LNG, and emerging climate technologies.

8. Mission Driven Strategies (MDS)

Specialist in climate and clean energy communications with experience working alongside venture-backed climate tech companies, climate-focused nonprofits, and policy organizations.

Which global network firms have sustainability practices?

9. Edelman, Global Sustainability Practice

Edelman's global sustainability and ESG practice is one of the largest dedicated climate communications operations in the agency world, drawing on the firm's annual Trust Barometer research and substantial public affairs depth.

10. FleishmanHillard, Sustainability Practice

FleishmanHillard's sustainability practice supports both traditional energy companies navigating energy transition narratives and dedicated climate tech companies, with strong public affairs, regulatory, and stakeholder engagement capability.

11. Brunswick Group, Sustainability Practice

Brunswick's sustainability work is concentrated on capital markets, ESG corporate reporting, and stakeholder engagement for major corporates navigating climate disclosure obligations and energy transition strategy.

12. Allison+Partners, Climate Practice

Allison+Partners has built a dedicated climate practice serving climate tech, sustainability, and ESG-focused clients across consumer, B2B, and corporate categories.

Which firms specialize in environmental advocacy and policy?

13. Caplan Communications

One of the largest U.S. firms specializing in environmental advocacy. Long-running client roster of environmental nonprofits including Earthjustice, Environmental Defense Fund, Friends of the Earth, and Greenpeace USA. O'Dwyer's-recognized for environmental and public affairs campaign work.

14. Fenton

Fenton is a long-established progressive communications firm with substantial climate, environmental advocacy, and clean energy work, particularly relevant for climate-focused nonprofits, advocacy campaigns, and policy-driven communications.

15. Spitfire Strategies

Spitfire is a Washington, D.C.-based strategic communications firm with substantial climate and environmental advocacy work for nonprofits, foundations, and policy organizations.

16. Cerrell

L.A.-based firm operating one of the largest and most integrated Environmental Energy departments in PR. Expertise spans coalition building and alliance development, technical communication, and community outreach across California and national campaigns.

Which other firms are worth a look?

rbb Communications is a Miami-based full-service agency whose services, per its O'Dwyer's listing, include PR and media relations, digital, crisis and reputation management, and creative content. Makovsky PR & Integrated Communications (NYC) has long-standing energy and sustainability experience, with former DOE public affairs leadership. Finn Partners / Widmeyer Public Affairs covers sustainable agriculture, smart grids, green buildings, and broader environmental PR with offices in Washington and New York. Hill Impact handles climate advocacy and policy-driven campaigns. Beckerman PR (NJ) owns Antenna and operates broader sustainability work. EWR Digital is a Houston digital marketing and SEO agency founded in 1999, led by Matt Bertram, that focuses on energy and industrial clients.

What do environmental PR services include?

Environmental PR services cover media relations, claims review, community and stakeholder engagement, policy and advocacy communications, executive visibility and crisis preparation for companies and organizations working on climate and environmental issues. Which services matter most depends on the client type, as the firm entries above show.

• Media relations and technical storytelling. Translating battery chemistry, grid architecture or carbon accounting into stories for trade, business and mainstream press. Climate tech specialists such as Redwood and Antenna Group build their practices around this work.
• Community engagement and permitting support. Building local support for wind, solar and energy infrastructure projects. Tigercomm's entry highlights community engagement as its particular strength.
• Policy and advocacy communications. Campaigns for nonprofits, foundations and coalitions, the core of Fenton, Spitfire Strategies, Caplan Communications and Cerrell.
• Claims review and greenwashing risk. Checking that every environmental claim can be substantiated before it is published. EPR's cleantech PR playbook and sustainability PR guide cover the rules and the practice.
• Capital markets and ESG communications. Disclosure, investor and stakeholder messaging for large corporates, the focus of Brunswick's sustainability work.
• Executive visibility and crisis preparation. Building named technical spokespeople and a plan for safety incidents, overclaims and funding failures, the crisis patterns the cleantech guide describes.

Pricing varies by scope, and EPR's PR firm cost guide gives estimates by firm type. For the wider discipline, read EPR's green public relations guide.

How do you choose a climate or environmental PR firm in 2026?

Match the firm to the brief. Three buckets: (1) Venture-backed climate tech startups typically work with dedicated specialists like Redwood, Tigercomm, Silverline, Antenna Group, The Climate Hub, and Greenhouse. (2) Major corporate ESG and energy transition work typically gravitates toward Edelman, FleishmanHillard, Brunswick, and Allison+Partners. (3) Climate advocacy and policy-driven campaigns flow to Fenton, Spitfire, Caplan, and Hill Impact.

Check AI-search visibility alongside traditional media relationships. Investors, journalists, and regulators now routinely start research inside ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews. Ask any shortlisted firm how it measures and builds visibility on that surface, not just traditional placement counts.

Test the regulatory and community engagement infrastructure. Permitting, IRA tax credit narrative, state-level PUC engagement, community social license, these are non-negotiable in climate work. Tigercomm leads on community engagement; the policy specialists (Fenton, Spitfire, Hill Impact) lead on advocacy infrastructure.

Set a budget and run a proper interview. EPR's PR firm cost guide estimates retainers across firm types, and its guide to interviewing a PR agency gives the questions to ask before you sign.

What does political volatility around climate policy mean for firm selection?

Federal climate policy has shifted direction more than once across recent administrations, and that volatility changes what buyers should look for in a firm. A specialist that built its entire book around a single incentive structure, an IRA tax credit program, for example, carries more exposure if that policy changes than a firm with a diversified base across state-level programs, private capital narratives, and international markets. When evaluating a climate PR firm in 2026, it is worth asking directly how much of its client base depends on a single federal program remaining intact, since that answer says as much about the firm's resilience as any client list does.

Adjacent EPR Frameworks

• What Is Cleantech PR? A Clean Energy Claims Playbook
• Green Public Relations: The Complete Guide to Sustainability Communications
• PR Firms Directory (A-Z, Specialty, Region)
• Who Controls AI Answers in Energy and Climate
• The Citation Share Index