Top 10: Sustainability Consultants

As sustainability reporting requirements increase and near-term goals loom, consultancies are playing a central role in supporting companies on the road to net zero.

In this Top 10, Sustainability Magazine spotlights some of the most prolific, innovative and influential consultancies working in sustainability today.

10. Accenture

Sustainability Services Lead: Stephanie Jamison
HQ: Dublin, Ireland

Accenture has a reputation for helping its clients to embed the principles of ESG into their products, services and operations. Its sustainability services span strategy, technology and delivery, covering everything from decarbonisation and responsible value chains to sustainable cloud and digital solutions. 

The consultancy frequently works with clients to design new offerings in areas such as green software, circular services and sustainable customer experiences, framing sustainability as a catalyst for revenue growth and competitiveness.

Deloitte has built one of the largest global sustainability and climate practices, advising companies and public bodies on the transition to a more resilient, low-carbon economy. Its multidisciplinary teams bring together expertise in strategy, risk, technology and operations to deliver net zero roadmaps, ESG reporting solutions and sustainable supply chain programmes. 

The firm emphasises implementation, supporting organisations to rewire governance, incentives and processes so that sustainability becomes embedded in decision making and value creation.

Capgemini’s sustainability offering covers technology, engineering and consulting, helping organisations to decarbonise and digitise simultaneously. Its teams support clients on topics such as sustainable IT, low-carbon operations, circular product design, ESG data and reporting. 

Capgemini is particularly active in sectors undergoing profound transformation, including energy, manufacturing, mobility and consumer goods. The firm advocates practical roadmaps and scalable solutions that can translate high-level commitments into operational reality.

Sustainability consulting is at the heart of EY's business. For years, the UK-based firm has advised clients on how to create long-term value for stakeholders while managing climate and social risks. Its teams support organisations on ESG strategy, regulatory readiness, climate reporting, sustainable finance and impact measurement. 

Drawing on its global assurance, tax and consulting capabilities, the firm offers integrated solutions that connect sustainability with the bottom line, innovation and digital transformation, helping businesses build trust and resilience.

PwC has rapidly scaled its sustainability and climate practice in recent years, supporting clients as they respond to pressure from regulators, investors and the general public.

The firm’s global network of specialists helps organisations interpret evolving standards, design credible transition plans and embed sustainability into governance, risk and performance management. PwC positions itself as a partner for end-to-end transformation, from materiality assessments to the implementation of decarbonisation and resilience programmes.

ERM (Environmental Resources Management) is a specialist sustainability consultancy, long recognised for its technical depth across environment, health, safety and social impact. It advises clients in complex, often heavily regulated sectors such as energy, mining, chemicals and manufacturing. 

ERM’s teams work across the project lifecycle, from early ESG risk assessments and permitting to decarbonisation strategies, nature-based solutions and just transition planning. 

The firm combines scientific and engineering expertise with strategic advisory services.

Bain & Company’s sustainability practice helps clients turn ambition into measurable outcomes, linking climate and social impact directly to business performance. 

Its consultants help companies set credible net zero pathways, redesign product portfolios and supply chains, and build low-carbon, circular operating models. Bain is known for its work with private equity and corporates on ESG due diligence and value-creation plans that integrate environmental and social considerations. 

The firm is a proponent of pragmatic, execution-focused support, from decarbonisation roadmaps and nature strategies to stakeholder engagement. Its approach positions sustainability as integral to strategy, innovation and long-term value creation.

Boston Consulting Group has embedded sustainability at the heart of its strategy work, advising leading organisations on how to thrive in a low-carbon, resource-constrained world. Its climate and sustainability teams support clients on topics from science-based targets and transition planning to circular business models and sustainable operations. 

BCG is known for rigorous analytics, scenario planning and its role in shaping global climate debates through partnerships and research. The firm blends strategic advice with implementation support, helping corporates and public institutions to decarbonise, de-risk and capture new growth in green technologies, sustainable finance and inclusive business models.

McKinsey & Company has become synonymous with board-level conversations on climate, transition and sustainable growth. 

Its dedicated sustainability practice works with governments, multinationals and investors to decarbonise value chains, redesign portfolios and unlock green growth opportunities. Consultants draw on deep sector expertise in energy, industry and finance, pairing data-rich modelling with on-the-ground transformation support. 

From net zero roadmaps to nature-positive strategies and just transition programmes, the firm positions sustainability as a source of competitive advantage rather than compliance burden, helping clients move from pilot projects to systemic change at pace and scale.

SE Advisory Services partners with organisations to turn bold sustainability and energy ambitions into measurable impact, aligning strategy, technology and implementation from day one.

Backed by Schneider Electric, it combines deep domain expertise, intelligent software and global implementation support to tackle complex challenges across decarbonisation, energy efficiency, risk and resilience, and industrial digital transformation.

SE Advisory Services offers a practical route to accelerate sustainable business transformation, future‑proof operations and build resilient, low‑carbon value chains in an increasingly volatile climate and regulatory landscape.