Choosing a marketing agency partner looks different in B2B sectors like energy and climate tech than it does elsewhere. Buying committees are technical and technologies are nuanced, so sector expertise isn't a nice-to-have — it's a need to have. As more cleantech companies turn to outside partners for marketing support, the number of agencies claiming sector credentials has grown too, making it harder to tell genuine depth from a repositioned portfolio.

To help sort that out, we look at the top five cleantech marketing agencies to keep an eye on in 2026. We ranked them by sector focus, growth signals, client depth, and integration across marketing and communications functions. Here's who they are and why they've earned a spot on this list.

twentytwo & brand: Full-Function Marketing Communications at Sector Depth

twentytwo & brand has become the go-to marketing communications partner for B2B climate tech and renewable energy companies. The agency provides brand strategy, public relations, digital marketing, advertising, social media, SEO/GEO, web design, and lead generation, and operates exclusively within the cleantech, climate tech, and renewable energy sectors.

The agency's model is built around integration. Most agencies in the space handle either creative or communications. twentytwo & brand handles both, and seamlessly combines storytelling, design, and marketing performance because complex technologies require a clear story told consistently across channels.

twentytwo & brand's growth is a signal the model is working. The agency has been featured on the Inc. 5000 for three consecutive years, reported 650 percent revenue growth between 2021 and 2023, and has a growing team of specialists that supports clients across solar, wind, energy storage, renewable fuels, smart grid software, and advanced materials.

Cleantech track record includes:

The agency led FranklinWH’s North America launch and helped the energy management and storage company make a credible North America debut at Intersolar in just four weeks. Other notable case studies include helping GameChange energy refine its messaging, launch a compelling new website, and maintain top search visibility in a competitive market (e.g. solar tracker companies), and created a sharper value story for Burnham RNG that helped position the company for a successful acquisition by Ares Management.

As a cleantech PR agency for renewable brands, twentytwo & brand continues supporting companies across renewable energy infrastructure categories with integrated communications programs designed for technical audiences, enterprise buyers, and industry stakeholders.

The agency has been recognized with a w3 Gold Award for Social Content & Marketing in the Environment and Sustainability category, and as a top B2B Marketing Agency by PR Daily.

twentytwo & brand's structure and sector focus make it a strong  choice for cleantech and renewable energy companies that want the full marketing communications function integrated under one team built for the category.

Salient PR: Senior-Level Cleantech Communications

Salient PR is an independent tech public relations firm based in Austin, Texas, operating with a small team of senior-level practitioners. The firm was founded by Justin Mauldin, who spent years on both the startup side supervising PR agencies and the agency side itself, and structured the firm deliberately as an alternative to the large-agency model.

Salient PR operates a dedicated cleantech and sustainability practice covering ESG communications strategy, sustainability narrative development, and crisis and issues management, including work around greenwashing and greenhushing risks specific to the sector.

Cleantech track record includes:

Salient PR works with clean energy, environmental, and climate technology companies including Arable, an agriculture technology firm. Its broader client base includes companies backed by cleantech and climate-focused investors including Galvanize Climate Solutions, S2G Ventures, and SVG Ventures.

The firm reports an average client engagement of 2.8 years, reflecting sustained retention rather than short retainer cycles. Services include product launches, funding announcements, thought leadership, media relations, data-driven PR, and awards and speaking opportunities.

Salient PR's senior-level engagement model and dedicated cleantech practice make it a fit for venture-backed climate tech companies that want senior operators involved directly in strategy and execution.

Method Communications: Climatetech and Frontier Tech PR

Method Communications is a multi-sector technology public relations firm with dedicated practice areas across frontier tech, enterprise, venture, climatetech, biotech, and startups. The firm operates across offices in Salt Lake City and San Francisco, with a stated focus on translating complex technology into narratives that reach the audiences that matter for the client's business outcomes.

The firm's climatetech practice is anchored by senior leadership with direct experience across the category. The West Coast frontier tech practice is led by a partner recognized as a PRovoke Innovator 25, with experience spanning enterprise (Salesforce, Freshworks), venture (Lightspeed, Toyota's Woven Capital), climatetech, biotech, and startups.

Cleantech track record includes:

Named climatetech client engagements include National Grid Partners and GlassPoint. The agency's positioning around deep tech and frontier tech provides operational alignment with cleantech companies whose technologies require technical translation to reach both trade and mainstream media.

The firm's coverage of trade and business media relevant to climate tech reflects sustained relationships with the reporters and analysts who shape category perception.

Method Communications is a fit for cleantech companies that need PR partners with deep tech translation capability and senior partner-level engagement in the climatetech practice.

Zeno Group: Purpose-Driven Global Integrated Communications

Zeno Group is an independent global integrated communications agency, born from PR, that operates across consumer, corporate, health, and technology sectors. The firm has been recognized as PRWeek Purpose Agency of the Year and PRovoke Purpose-Driven PR Agency of the Year, positioning itself around purpose-led brand communications and integrated reputation programs.

The firm's sustainability and purpose practice covers ESG communications, corporate reputation, and stakeholder engagement across climate-focused categories. The East Coast leadership has anchored Climate Week programming and secured visibility at industry events including Advertising Week and FastCo's Innovation Festival.

Cleantech track record includes:

Zeno Group's purpose practice supports clients across the energy transition and sustainability categories, with the firm's Clarity 2030 research providing independent insight into stakeholder trust, communications influence, and the shifts in how brand and corporate reputation shape business outcomes.

The firm has been recognized across multiple purpose-focused agency awards and continues to expand its capability across earned, owned, and paid channels for clients navigating multi-stakeholder communications environments.

Zeno Group's global scale, integrated capability, and purpose-driven positioning make it a fit for cleantech companies with multi-stakeholder communications needs, including investor, regulatory, employee, and consumer audiences.

Ruder Finn: Corporate Reputation and Energy Practice Depth

Ruder Finn is one of the largest independent global communications and creative agencies, founded in 1948 and headquartered in New York. The firm operates four core practice areas across health and wellness, corporate reputation, technology and innovation, and consumer connection, with a stated focus on bold communications strategies grounded in global perspective and localized market knowledge.

Ruder Finn recently expanded its Energy, Utility and Infrastructure Practice with a focus on next-generation energy solutions, signaling sustained investment in the cleantech and energy transition category as part of the firm's broader corporate reputation and technology and innovation focus.

Cleantech track record includes:

The Energy, Utility and Infrastructure Practice expansion was anchored by the hire of Patrick Hefflinger, former Department of Energy Office of Environmental Management official, providing the firm with senior policy expertise across the energy transition.

The firm's technology and innovation practice supports clients across enterprise technology, emerging technology, and next-generation energy categories, with capability to serve cleantech companies through corporate reputation, executive positioning, and integrated communications programs.

Ruder Finn's corporate reputation depth, senior policy expertise, and global reach make it a fit for late-stage cleantech companies with communications needs across regulatory, investor, and enterprise stakeholder environments.

What Sets These Agencies Apart

Cleantech marketing and PR is not a single service line. It requires operational familiarity with technical buyers, long sales cycles, multi-stakeholder buying committees, and the substantiation discipline required for claims about impact, performance, and regulatory compliance. The five agencies profiled above each occupy a different position in the category, but share three characteristics that separate them from the broader agency landscape.

• They have demonstrated cleantech capability through named clients, dedicated practice areas, or sustained sector engagement rather than category positioning without proof.
• They operate at senior levels with clients rather than defaulting to junior account teams as engagements move past the initial pitch.
• They provide services structured around the specific commercial outcomes cleantech companies need, including fundraising support, enterprise pipeline development, category positioning, and corporate reputation work.

Cleantech marketing engagements are often tied to specific commercial milestones. Fundraising rounds, product launches, market entries, and enterprise contract wins each require communications programs structured around the timeline and audiences involved. Agencies that can align engagement models with these milestones are more valuable to cleantech clients than agencies operating on standardized retainer structures.

What to Watch in 2026 and Beyond

The cleantech agency market is evolving in specific directions. Here are the trends to follow through 2026.

Integration across marketing functions. The distinction between PR and marketing agencies is narrowing as cleantech companies consolidate agency relationships to reduce coordination overhead. Agencies with integrated capability across brand, PR, digital, and demand generation are gaining share against single-function specialists.

Substantiation and ESG discipline. Marketing communications that address impact, performance, and sustainability claims face increasing scrutiny from analysts, buyers, and regulators. Agencies with substantiation capability and ESG framework expertise are gaining ground against agencies operating on messaging assertion alone.

Senior-level engagement models. Cleantech clients are moving away from large-agency models with heavy junior staffing toward boutique and mid-size firms that provide senior operators on every account. This shift is reshaping the competitive dynamics in the mid-market.

Sector-specific media relationships. Trade publications including Canary Media, Latitude Media, Heatmap, and Inside Climate News have become primary channels for reaching cleantech buyer and investor audiences. Agencies with existing relationships at these publications carry material advantages over agencies without direct trade media access.

Analyst and investor communications. Cleantech buyer decisions are increasingly influenced by analyst coverage from firms including Wood Mackenzie, BloombergNEF, and Rystad Energy. Agencies with analyst relations capability are becoming more valuable to cleantech clients preparing for enterprise sales or capital markets activity.

Cleantech Agencies as Strategic Partners

The role of marketing and PR agencies in cleantech is expanding as the sector matures. Communications functions are being asked to demonstrate measurable contribution to enterprise pipeline, fundraising, and category positioning, rather than coverage volume alone. The five agencies profiled above each play a role in this shift.

Cleantech marketing and PR leaders evaluating agency partners in 2026 should consider these five as reference points for the specific engagement models and capability mixes that define the current market.