Simon Booth

Simon is our co-founder and CEO of Zestec. He has been delivering an integrated range of funded renewable energy projects for commercial and industrial clients since 2010 and in his current role, he leads a multi-disciplinary, highly talented, dedicated team of renewable energy professionals.

Yvonna Balysz

As our Head of Legal, Yvonna supports the Zestec Team with all legal stages in developing, installing and managing its solar projects, from initial heads of terms, contract negotiations and installation, to asset management. Yvonna is passionate about making a real difference in the fight against the climate emergency and has gained renewables experience in solar, biomass, EV charging and batteries.

Toby Smith

Toby is our co-founder and COO who leads the delivery function at Zestec where he has designed and implemented the delivery systems and processes that have placed the business at the very top of the C&I funded solar PV market. Through the partnership with Octopus Toby has grown and developed the delivery team that is now successfully delivering for a diverse range of clients such as Amazon, major UK airports, and large multi-site programmes for major UK supermarket chains.

Kate Erminasa

Kate oversees our financial planning and HR functions, ensuring our organisational goals align with nurturing a vibrant and productive work environment. To do this Kate has to seamlessly blend both HR and financial strategies to achieve organisational success.

Will Grace

Will leads the team responsible for the performance of our portfolio of solar assets across the UK. He is committed to working closely with our O&M providers and clients to ensure best practice asset management so that our assets operate efficiently, and generate the maximum possible green electricity safely.

James Mackinnon

James runs our team that supports the delivery of projects from sales to installation and operation. As well as financial modelling, analysis of performance, and technical reviews, he also stays involved with training new team members.

Samantha Whittle

As Zestec’s Executive Administrator, Sam offers high-level support to the Leadership Team and Project Delivery Team, facilitating the growth of fully funded renewable solutions for our clients. With over 20 years of experience in business support and administration, Sam is keeping us in check with her dedication to enhancing organisational efficiency and productivity.

James Harman

James supports the company with comprehensive health and safety services across all business units, including inspections, guidance, training, safety regulations and supports the implementation of our safety management systems.

Sophie Breakell

In Sophie’s own words; ‘I was lucky enough to find Zestec early on in my career’ which was also fortunate for us. Sophie speaks with businesses looking to reduce their electricity bills and carbon output via a PPA. With a degree in Natural Sciences, she lives and breathes all things solar.

John Toms

As the Co-Head of Project Delivery, John is responsible for overseeing project delivery, stakeholder collaboration, and operations to create the strategic direction within the business.

Stephanie Salguero

Stephanie looks after all things Marketing at Zestec. She has worked in the renewable energy space since 2018 and has a keen interest in sustainability. She works closely with each team to ensure communication alignment and marketing activities coordination.

Neil Clayton

Neil is our Co-Head of Project Delivery. With John, he leads our Project Management team and key accounts to ensure everything from designs, contracts, construction and management of a project runs smoothly for our clients.

Jess Doble

Jess is our client engagement executive here at Zestec, specialising in hunting for new projects, partners, and opportunities to generate as much renewable energy as possible for the UK.

Martin Harris

Martin is a Contract Manager at Zestec Asset Management, bringing a wealth of engineering, contractual, and commercial experience to the team. He plays a pivotal role working in partnership with our project delivery teams through the late stages of construction, handover, and defect liability periods—ensuring smooth transition of high-quality assets into our expansive Asset Management portfolios.

Elizabeth Gibbons

Elizabeth manages the development of projects from feasibility and development phases, through contract negotiations and installation, to commissioning and handover to asset management. Communication is key to Elizabeth’s role, working with the end users and installation partners to deliver the projects on time and within budget. 

Cameron Beauclerk

As a Senior Asset Manager, Cameron takes care of a variety of our operational new-build and legacy rooftop solar projects. Before that, after 4 years in commercial property, he worked for 3 years managing utility scale solar projects on behalf of community energy organisations around the UK.

Zoe Protopsaltis

Zoe is a Junior Asset Manager at Zestec, specialising in residential solar PV portfolios. She plays a key role in monitoring and optimising system performance across a growing portfolio of assets, ensuring safe, efficient operations and strong returns. Working closely with clients, contractors, and internal teams, she supports performance analysis, maintenance coordination, and portfolio management activities to deliver long-term value and asset reliability.

Olamide Olayiwola

Ollie Baker

Ollie is a key member of the Finance team, delivering financial reporting across Zestec’s legacy SPV portfolios while also identifying opportunities to optimise generation and revenue. His work plays an important role in maximising financial value across the portfolio.

Louise Farah

Louise manages the development of projects from the feasibility and development phases, through contract negotiations and installation, to commissioning and handover to asset management.

Owen Casey

Owen is one of our Junior Solar Design Engineers, part of the team that designs, simulates and optimises the PV systems for our commercial partners. He has a strong technical background in Renewable Energy Systems and Chemical Engineering. Owen is especially passionate about bringing affordable sustainable solutions further into the forefront of society.

Andrew Lavin

Andrew is a Client Engagement Executive at Zestec.

Ben Audsley

Ben manages the development of projects from the feasibility and development phases, through contract negotiations and installation, to commissioning and handover to asset management.

Russ Kelsall

Russ manages the development of projects from feasibility and development phases, through contract negotiations and installation, to commissioning and handover to asset management.

Liberty Kinlin-Martin

Liberty is our Solar PV Design Engineer. From the beginning of a renewables project, she runs the initial yield calculations to design the systems to suit the client’s needs, as well as working with James on the financial modelling, analysis of performance and technical reviews.

George Hammerton

George is a Junior Solar Design Engineer at Zestec, supporting the design and optimisation of commercial solar PV systems. With a background in Renewable Energy Engineering, he has a particular interest in solar, energy storage and grid integration, and is passionate about developing practical solutions that help accelerate the transition to a cleaner and more resilient energy future.

Priyat Madhur

Priyat is part of the asset management and finance team where she monitors and analyses asset and portfolio performance and identifies where improvement could be made to maximise portfolio revenue.

Grace Mammatt

Craig Miles

As Zestec’s Management Accountant Craig is primarily responsible for analysing and reporting the financial performance of our projects. His day-to-day role also encompasses budget renewal and monitoring, as well as providing support for annual financial account audits, among other responsibilities

Asher Prout

Ash is a dedicated solar Senior Project Manager, holding a Master’s degree in Mechanical Engineering, Ash brings a robust technical background to the table, coupled with a passion for sustainable solutions.

Charlotte Taylor

Charlotte is a key member of the Finance team, helping to ensure the team operates effectively and efficiently. Her keen eye for detail plays an important role in maintaining the accuracy of Zestec’s financial records, working closely with Kate, Craig and Ollie, as well as colleagues across the wider Zestec team.

Felix Ma

Felix is our Junior Asset Manager at Zestec Asset Management. He has an engineering background and a passion for building a low-carbon future. Felix plays a key role in optimising asset performance across our portfolio.