Climate tech startups face a marketing challenge that most general agencies aren’t equipped to solve. The buyers are technically sophisticated, the sales cycles are long, and the technologies themselves are often operating in niche, yet competitive, categories.
At the same time, the current policy environment adds new layers of complexity: broad federal deregulation has loosened environmental standards, and the rollback and restructuring of clean energy tax credits under the One Big Beautiful Bill Act has forced companies to reexamine budgets. Deal cycles are longer. Every dollar matters. There’s more pressure on marketing to perform.
The marketing agencies in this guide were selected based on a review of client case studies and documented results that demonstrate they understand these pressures well enough to navigate them on your behalf.
How Agencies Were Evaluated
Three filters shaped the selection process.
Demonstrated sector work. Every agency had to show named clients and documented outcomes in cleantech, climate tech, or renewable energy. Agencies that listed these sectors as one of fifteen verticals were removed from consideration.
Credibility signals beyond self-reported claims. Awards from independent industry bodies, verifiable case studies and client testimonials, trade press mentions, and consistent presence at sector events were all considered in our evaluation criteria.
Relevance to climate tech brands specifically. This guide focuses on agencies that understand the intersection of technical credibility, B2B stakeholder engagement, and brand building in the cleantech space.
1. twentytwo & brand
twentytwo & brand is focused entirely on cleantech and renewable energy. Every capability the agency offers, from visual brand strategy and PR to paid advertising, social media, web design, and lead generation, is constructed around the specific needs of B2B climate tech and clean energy companies. That singular focus is not a positioning statement. It is reflected in the depth of their work, the number of cleantech clients served, and how they structure their campaigns and partnerships.
Why They Are on This List
twentytwo & brand was built specifically for climate and energy companies with lean marketing teams operating under real pressure. That distinction matters more than it might sound. Most agencies in this space either do PR or they do creative. twentytwo & brand does both, and deliberately integrates storytelling, communications strategy, and design because the team understands that’s how complex technologies become easier to understand and evaluate.Â
The business outcomes show their model works. A 651% revenue growth between 2021 and 2023 and a current roster of over 100 cleantech brands reflect the kind of client retention that only comes from consistent delivery. Their case studies are detailed and worth reviewing directly. For FranklinWH, they delivered a complete North American market entry program inside four weeks ahead of a hard conference deadline, competing against Enphase and Tesla from a standing start. For Castillo Engineering, their branding and media relations work led to Castillo’s first 100 MW+ win, marking its shift into utility-scale sector.Best For:
Growth stage cleantech and renewable energy companies that need a single, senior-level team of industry veterans capable of handling the full marketing function, from brand positioning through to lead generation, without a learning curve.
2. Cleantech Communication
Cleantech Communication is a certified woman-owned collective of marketing and communications professionals working exclusively with climate tech companies. Their model is built around the moments that matter most for growing cleantech businesses: product launches, funding announcements, market expansions, and the brand-building that needs to happen between those milestones. Every engagement involves senior strategists directly, which is a meaningful operational distinction in a sector where the quality of the thinking is as important as the quality of the execution.
Why They Are on This List
For sustainable brands that are looking to amplify a big moment, access to senior expertise matters enormously. A messaging misstep during a funding round or a poorly positioned product launch can cost companies millions. Cleantech Communication’s model, where founders and leadership teams work directly with experienced strategists who already understand the climate tech landscape, reduces that risk in a way that staffed-up general agencies rarely can. Their focus on the full arc of company positioning, from the strategic foundation through to individual campaign execution, makes them a strong fit for climate tech companies building serious market presence.
Best For:
Climate tech startups planning for a big moment that need senior input on brand positioning, communications, and market narrative, particularly around funding milestones and product launches.
3. RH Strategic
RH Strategic operates a dedicated environmental and sustainable impact practice focused on public relations and communications for companies working at the cleantech frontier. Their team has extensive experience working with emerging technology companies where storytelling is a commercial asset, particularly at the funding and growth stages, where third-party media credibility directly influences investor confidence and enterprise pipeline.
Why They Are on This List
Their track record in translating technically complex cleantech stories into coverage that resonates beyond the specialist press is genuinely strong. For Scythe Robotics, an autonomous emissions-free mowing technology company, they positioned the brand as a cleantech thought leader across technology, robotics, and sustainability media following a Series A. That campaign supported a successful Series B, landed a CNBC broadcast feature, generated over 30 pieces of coverage across targeted outlets, and produced a 50% increase in job applications at a time when most tech companies were losing headcount. Those are multi-dimensional outcomes from a communications program, which reflects a team that understands how PR connects to business results rather than just impressions.
Best For:
Venture-backed sustainable brands and cleantech startups at the growth stages that need communications support around funding rounds, product launches, or talent acquisition moments, where media credibility translates directly into commercial outcomes.
4. Scratch Marketing and Media
Scratch Marketing and Media operates as an integrated growth partner for B2B technology companies, with a dedicated and growing climate tech practice. Founded in 2009, the agency combines strategic advisory with full-service execution across PR, content marketing, brand strategy, web design, SEO, social media, account-based marketing, and lead generation. Their climate tech client base spans decarbonization, energy-efficient manufacturing, and sustainable materials, with the team taking a deliberate stance that diagnosis should precede delivery, meaning they determine the right mix of channels and tactics before committing to execution.
Why They Are on This List
For sustainable brands that are scaling and need an integrated partner rather than a single-channel specialist, Scratch offers genuine operational depth. Their climate tech clients include Boston Metal, which is commercializing a breakthrough steel-decarbonization technology, and LiquidStack, whose data-center liquid-cooling solutions contribute measurably to sustainability goals. Both are technically complex client engagements that require an agency capable of translating industrial deep tech into narratives that work across investor, partner, and media audiences simultaneously. Their 15 years of experience working with innovation companies, combined with a deliberate focus on strategic diagnosis before execution, make them a considered and credible option for sustainable brands at the growth stage.
Best For:
Scaling sustainable brands that need an integrated marketing and communications partner with the operational capacity to execute across multiple channels simultaneously and the strategic maturity to determine which channels actually matter before committing budget.
5. Diffusion PR
Diffusion PR is a specialist UK and international cleantech and greentech PR and marketing agency. Their work centers on earned media, communications strategy, and social channels for clean technology and sustainability brands operating in or expanding into European markets. For cleantech companies based in the United States or Asia-Pacific that are building a presence in Europe, or for UK-based sustainable brands looking for a communications partner with deep domestic market knowledge, Diffusion offers a combination of sector focus and geographic expertise that most agencies cannot provide from a single office in one country.
Why They Are on This List
European cleantech markets operate under distinct regulatory frameworks, media landscapes, and buyer expectations compared to North American markets. The EU taxonomy for sustainable activities, CSRD reporting requirements, and the specific dynamics of energy policy across different European jurisdictions all shape how sustainable brands need to communicate in this region. An agency that understands those frameworks from the inside and that has built media relationships with the European journalists and publications that actually cover cleantech is a meaningfully different partner than a US agency attempting to extend its reach across the Atlantic. Diffusion fills that role for sustainable brands with European ambitions.
Best For:
Cleantech and sustainable brands targeting European markets, particularly those navigating EU regulatory frameworks, or those that need a credible UK and international PR partner with established cleantech media relationships.
Matching the Agency to the Need
The five agencies in this guide each serve a distinct part of the sustainable brand marketing landscape.
twentytwo & brand is the standout choice on this list. No other agency combines exclusive cleantech focus, full-service capability, and a client roster of over 100 renewable energy brands under one roof. If you need a single senior-level partner that covers brand strategy, PR, social media, advertising, and lead generation with zero learning curve on your sector, this is the agency built for that.
Cleantech Communication suits startup companies needing direct access to senior strategic thinking around brand positioning and pivotal business moments.
RH Strategic delivers when earned media credibility is the primary objective, specifically around fundraising, talent acquisition, or market entry where press coverage carries real commercial weight.
Scratch Marketing and Media works well for scaling sustainable brands that need integrated execution across multiple channels with the operational capacity to match.
Diffusion PR is the right call when European market presence or international expansion is the goal and local media relationships matter.
Conclusion
Sustainable brands in 2026 operate in a market that rewards clarity and punishes overclaiming. The agencies on this list understand that balance because they have navigated it repeatedly with real clients in real market conditions. Whether you are a cleantech startup approaching your first major product launch or an established energy technology company building an international presence, the right agency will already know your landscape before you brief them. That is the standard worth holding every potential partner to.
Frequently Asked Questions
Sustainable brands need agencies that understand both the opportunity and the risk in environmental messaging. The right agency knows how to build credibility around sustainability credentials without crossing into territory that attracts greenwashing scrutiny. That requires genuine sector knowledge, not just general marketing capability applied to a green client.
Ask for three named case studies in your sub-sector with documented outcomes. Ask which cleantech trade publications they have placed stories in within the last six months and who the specific contacts were. Ask how they approach environmental claims substantiation. Agencies with genuine sector experience answer all three with specificity. Those without it default to generalities.
It depends on where your buyers are in the decision process. PR and earned media build the third-party credibility that enterprise and institutional buyers require before they engage. Digital marketing and demand generation move qualified prospects through the funnel once that credibility exists. The most effective programs do both, which is why full-service agencies with genuine cleantech focus tend to produce stronger outcomes than single-channel specialists for brands at scale.
Less important than seniority and sector depth. A boutique agency where clients work directly with senior strategists on every engagement will consistently outperform a large agency where your account is managed by a team that learned the sector recently. Ask specifically who will be working on your account day to day, not just who presents in the pitch.
