The Alliance

What does the Alliance do?

The Alliance provides the technical support offered by the Zero Carbon Accelerator. There is a wealth of expertise in the Alliance of seventeen organisations, spanning energy solutions to zero carbon strategy, retrofit to support with preparing for finance and funding opportunities. Through this Alliance, which include organisations from micro-SMEs up to large companies, the GLA shows its commitment to growing the supply chain.

Who are the Alliance?

The Mayor of London is delivering the Zero Carbon Accelerator in collaboration with Mott MacDonald, Energy Saving Trust and an alliance of experts: ACA Studios, Altair, Ambue, Arthian, ClimateView, COWI, EEVS, Energiesprong UK, ERM, IES, Pascall+Watson Architects, Pollard Thomas Edwards, Retrofit Academy, Roger Simpson-Jones and Zerogram.

Meet the 17 Alliance partners and learn about their specialisms:

An award-winning architectural firm known for its innovative design approach and expertise in delivering complex projects that enrich their surroundings.

Their diverse portfolio includes residential, commercial, hospitality, institutional buildings, urban regeneration, and master planning. ACA Studios focuses on creating functional, sustainable spaces that meet client and community needs, ensuring that sustainable design principles are integrated at every stage.

Collaboration is at the core of their process, as they work closely with clients, stakeholders, and other professionals to develop and craft cohesive, well-rounded solutions that address both immediate and long-term objectives.

acastudios.co.uk

Altair’s Sustainability team is dedicated to helping clients transition to a more sustainable and resilient organisation that withstands the challenges of a changing world.

Their services emphasise a proactive approach to achieving sustainability across your organisation to deliver excellence in environmental, social, and governance (ESG) areas. Altair specialises in carbon accounting, strategic retrofit, net zero strategies, decarbonisation pathways, ESG and climate risk management.

Altair is a firm believer in adopting a whole systems approach to foster sustainable growth. Achieving net zero cannot be done in silo if we are to deliver a fair and just transition. Altair therefore offer a range of complementary services to support their Sustainability team, providing expertise in strategic asset management, green finance, procurement, building safety, community impact and project management.

altairltd.co.uk

Making retrofit simple, with a strong foundation in architecture, design and technology.

Working with local authorities and housing associations, Ambue specialises in delivering grant funded SHDF PAS2035 retrofit for social housing landlords. Their services include identifying and rectifying disrepair, damp and mould, to enhance indoor air quality, energy efficiency, and resident comfort.

Ambue’s team of architects, retrofit coordinators and designers are supported by handpicked Retrofit Assessors, LiDAR Photographers and Pulse Air Testers. Their team of Software Developers collaborate with our retrofit professionals to develop the Ambue platform where they host the digital data, BIM and DESNEZ/Trustmark compliant reports.

ambue.com

Committed to the provision of tailored, leading-edge technical professional services with a focus on helping clients to “See a Difference”.

Arthian is a trusted partner, working collaboratively to deliver client-focused solutions.

We combine technical excellence, innovation, and industry experience to deliver the full lifecycle of a project. From feasibility and planning through to design and construction, we provide insights to allow our clients to make informed and strategic decisions for long-term success.

Our planning, environmental, engineering and safety consultants work across sectors including energy, industry, infrastructure and the built environment, providing innovative, sustainable solutions for people and the planet.

arthian.com

A Swedish technology company that helps public sector leaders make data‑informed decisions in the sustainability transition.

Its software platform provides cities with tools to plan, implement, monitor, and finance climate action strategies. Built on a science-based framework aligned with IPCC models, ClimateView enables integrated scenario modelling, progress tracking, and resource optimization. They drive impactful climate action through innovative, outcome-focused methodologies, supporting cities in managing emissions, achieving climate goals, and integrating economic planning to build sustainable futures.

ClimateView offers a platform that helps all actors part of the Zero Carbon Accelerator to turn complex data into actionable insights. With a modular, science-based approach, the platform fosters collaboration among these stakeholders, helping them to make informed decisions, track progress, and achieve tangible results toward the long-term sustainability goals.

climateview.global

Helping shape a future where people and societies grow and flourish.

Together with customers, partners and colleagues, COWI helps shape a future where people and societies grow and flourish. They do this by co‑creating sustainable and beautiful solutions that improve the quality of life for people today and many generations ahead.

COWI’s starting point is gaining a deep understanding of their customers, their aspirations and concerns. Primarily located in Scandinavia, the UK, North America and India, COWI is currently 8,000 people strong, offering expertise in engineering, architecture, energy and environment.

COWI provides a range of services related to district heating, including:

Feasibility studies: Assessing the potential of district heating in specific areas.
Design: Creating detailed plans for district heating networks.
Optimisation: Improving the efficiency and sustainability of existing networks.
Construction management: Overseeing the building and installation of district heating infrastructure.
Operation and maintenance: Providing ongoing support to ensure optimal performance.

cowi.com

The UK’s leading independent Measurement & Verification (M&V) specialist.

Their sole focus is helping their clients to prove the performance of energy and carbon saving schemes to IPMVP global best practice standards. Working with buyers and suppliers, EEVS helps build trust in claims of savings delivery and support successful partnerships based on proven results.

EEVS’s services give vital performance information to support continual improvement and credible results that bring confidence in delivery to build momentum. They work with Royal Mail, Lloyds Bank, Vodafone and public sector-wide, including over 10‑years supporting projects using the GLA’s Retrofit Accelerator – Workspaces scheme.

EEVS brings essential performance management and savings verification expertise to the Zero Carbon Accelerator. By offering training, advice, and verification EEVS ensures IPMVP best practice Measurement & Verification (M&V) is baked-into project set up and delivery. This will yield credible energy and carbon saving results that will drive continual improvement, build momentum, and accelerate uptake.

eevs.co.uk

A team of independent retrofit experts that collaborates with partners to create new approaches for home energy refurbishment at scale.

Their mission is for every UK home to be desirable, comfortable, affordable and fit for 2050 net‑zero standards.
Energiesprong UK works with local authorities, housing providers, building firms and the supply chain to:

develop and test innovative retrofit strategies, models and tools
aid the delivery of innovative schemes to upgrade homes
inspire sector change by showcasing real-life examples of transformation.
They are a non‑profit organisation and are wholly independent.

ESUK services offered include housing stock assessment, estate-wide and building-specific decarbonisation plans, solution/technology matchmaking, financial modelling, grant funding management, collaboration and innovation support (including study tours), programme development and delivery support – including with procurement, supplier matchmaking, quality assurance, performance measurement and verification, and PAS2035 services.

energiesprong.uk

An independent organisation dedicated to promoting energy efficiency, low carbon transport and sustainable energy use to address the climate emergency.

Their work focuses on reaching net zero targets by taking action to reduce energy consumption, installing new infrastructure and accelerating a move to sustainable, low carbon lifestyles.

Energy Saving Trust empowers householders to make better choices, deliver transformative programmes for governments and support businesses and community groups with strategy, research and assurance – enabling everyone to play their part in building a sustainable future.

Energy Saving Trust leads the marketing, communications and engagement activity for the Zero Carbon Accelerator, connecting organisations across London with the expert support they can access from the programme; the likes of which include Energy Saving Trust’s technical skills in energy efficiency, buildings analysis, low carbon technology and decarbonisation programmes.

energysavingtrust.org.uk

The largest advisory firm in the world focusing solely on sustainability, offering unparalleled depth and breadth of expertise.

ERM’s Sustainable Energy Solutions team creates a better future by helping clients identify, manage and take advantage of the innovation challenges and opportunities presented by the energy transition. Founded in 1971, they have over 150 experts across 10 activity areas, working globally as part of the ERM Group.

ERM will provide strategic overview, project development and technical support to the Zero Carbon Accelerator. They have led Net‑Zero pathway studies at national, regional and corporate level – including GLA’s Net‑Zero 2030. ERM has deep experience in project strategy, concept design, techno-economic analysis and business case development, and modelling tools adding significant value to the Zero Carbon Accelerator.

www.erm.com

A global climate tech company delivering innovative technology solutions and consultancy services to decarbonise the built environment.

Over the last 30 years, they have built a solid reputation as the leading global innovator in integrated performance-based building analysis and are now home to the largest building physics analytics team in the world. Supporting energy‑efficient, healthy and cost‑effective built-environments, IES’ digital twin technology provides those involved in the design, retrofit and operation of buildings the information needed to make smarter, more sustainable decisions with confidence.

IES provides energy modelling and digital twin services to the Zero Carbon Accelerator, through their physics simulation software. Covering single assets to entire regional Local Area Energy Plans, their data-driven approach supports zero‑carbon building design, operation and retrofit, de-risking energy efficiency and decarbonisation interventions. Their cloud‑based analytics platform provides accurate measurement and verification of interventions and visualisation of decarbonisation plans.

www.iesve.com

A leading consultancy offering planning, design, environmental, engineering and safety services.

Mott MacDonald is an employee-owned engineering, development and management consultancy, with projects worldwide. They plan, design, deliver and care for the infrastructure that society depends on – transport, energy, water and buildings. They apply digital innovation and technical excellence to improve outcomes for their clients, society and the environment.

Mott MacDonald leads the Alliance in delivering the Zero Carbon Accelerator, deploying end‑to‑end programme and project management, technical and engagement services to client organisations seeking Accelerator support. They bring deep experience of decarbonisation frameworks, including on non-domestic energy efficiency, public sector estates decarbonisation schemes and low carbon infrastructure transition programmes.

mottmac.com

An award-winning international design practice, with a global reputation for designing and delivering complex, intricate projects, both large and small in scale.

In operation since 1956, Pascall+Watson are an award-winning international design practice. Their geographic reach spreads across the globe, with expertise covering a broad cross-section of typologies including education, commercial and workplace, healthcare, leisure, hospitality, retail, government, research & development, and infrastructure projects.

As architects, designers and managers, their global reputation for designing and delivering complex, intricate projects, both large and small in scale, has been founded on a customer-orientated, flexible approach. Their focus is on achieving sustainable, high-quality, intelligent and efficient solutions for their clients, prioritising decarbonisation to reach net zero emissions and reduce its impact on climate change.

Pascall+Watson’s team of designers will work alongside Zero Carbon Accelerator organisations to recognise opportunities in the drive to net zero. The team will be able to provide general project development support through to specialist input such as masterplanning, design feasibility studies, technical workshops, low and zero carbon technology modelling through to delivery on-site of construction projects.

pascalls.co.uk

An architecture practice specialising in the design of homes, neighbourhoods, public and mixed‑use buildings.

Each year PTE’s multi-disciplinary team designs and delivers 1,000‑plus homes, across London, Essex and the southeast with research playing an essential role.

PTE uses practical experience to generate and develop research topics which in turn inform how it designs and delivers future built environment projects. Their design teams are supported by sustainability, social value and POE specialists and a technical Knowledge Hub.

PTE’s research also plays a key role in shaping the architectural profession’s outlook on a variety of topics, from estate regeneration, post-occupancy evaluation, local solutions to the housing crisis and the densification of the suburbs. They regularly collaborate and publish industry research on housing, climate change and urban design.

pollardthomasedwards.co.uk

The driving force in retrofit skills and knowledge, with a mission to attract, train and develop 200,000 competent retrofitters by 2030.

They have developed award-winning qualifications for Retrofit Advisors, Assessors, Coordinators and Designers and have trained 8,000 retrofitters. They have a membership of 80 organisations, who they work with to race to the top in retrofit. Their Professional Membership is the UK’s leading best practice community in the domestic retrofit sector.

The Academy is a trusted partner to industry and government. They have delivered award-winning Skills Bootcamp and Levelling-Up programmes. As Skills and Training Partner to the National Home Decarbonisation Group, they have pioneered a Retrofit Workforce Roadmap.

The Academy offer is based on skills and knowledge transfer. They are experts in developing eLearning, taking the complex and boiling it down to impactful training materials and assessments that can be accessed online. They can deploy these skills across all things net zero, not just their current heartland of domestic retrofit.

retrofitacademy.org

Roger Simpson‑Jones is a commercial expert with 15 years of experience developing market leading solutions in carbon reduction and renewable energy for public sector clients.

Roger lead the creation and continuous development of the market-leading RE:FIT programme that has delivered over £500m of energy reduction projects. He has extensive experience across domestic retrofit, solar and wind projects with projects totalling over £1bn, and his work has been recognised in several national procurement awards and by prominent international organisation.

Roger will provide in-depth and knowledgeable support to organisations looking to develop and procure solutions to progress their Net Zero plan. This includes support through the process from initial business cases through tender development and contract award into successful implementation and contract management.

A decarbonisation consultancy established in 2022, who has quickly become a go-to partner for organisations seeking to achieve their net zero goals.

Serving a diverse clientele, including multi-academy trusts, heritage organisations, and central government estate, Zerogram delivers bespoke decarbonisation roadmaps that drive tangible results. By combining strategic thinking with technical expertise, Zerogram empowers clients to reduce energy consumption, cut carbon emissions, and embed sustainability into their long-term plans. In under two years, Zerogram has made significant strides in supporting over 15 clients in their fight against climate change. The company’s rapid growth and impact demonstrate its commitment to fostering a sustainable future.

Through the Zero Carbon Accelerator, Zerogram offers comprehensive support to fast-track organisations’ paths to net zero. Their services include bespoke decarbonisation roadmaps, energy audits, renewable integration strategies, and carbon reduction planning. They provide expert guidance, technical assessments, and implementation support, leveraging experience with diverse sectors to accelerate sustainability journeys efficiently and effectively.

zerogram.co

The Alliance

What does the Alliance do?

Who are the Alliance?

ACA Studios

Altair

Ambue

Arthian

ClimateView

COWI

EEVS

Energiesprong UK

Energy Saving Trust

ERM

IES

Mott MacDonald

Pascall+Watson

Pollard Thomas Edwards (PTE)

The Retrofit Academy

Roger Simpson-Jones

Zerogram

See also