About us

Find out more about Powervault's mission and the people behind the UK's first electricity storage product for the home.

The Team

We are a growing, accomplished and cohesive team of professionals supported by an experienced Board of Directors.

Joe Warren portrait

Managing Director

Joe Warren

Joe has spent 10 years working in the smart grid sector and is passionate about working in start-ups to bring new, smart grid technologies to market. He spent the first half of his career working in the fast growing Internet sector as Director of Hosting Operations at Pipex Plc. There he led a seventy-strong team at five UK locations, and was responsible for IT hardware, software and power infrastructure supporting 4,000 businesses and 250,000 consumers. In 2007, Joe moved to Open Energi/RLtec when it was a start-up. He helped bring their smart grid dynamic demand product from concept to commercial reality, creating a new market in which Open Energi arrived first. Joe managed Open Energi’s relationship with National Grid over a period of seven years and agreed the first ever Dynamic Demand contract for demand side Firm Frequency Response, securing contracts with National Grid and Sainsbury’s. Joe joined Powervault in 2014 as Managing Director. He obtained a BA (Hons) from the University of Oxford in Experimental Psychology and an MBA from INSEAD.

Denis Wittich portrait

Technical Director

Denis Wittich

Before joining Powervault in 2015, Denis spent almost 10 years working in the automotive world of high-performance, hybrid and electric vehicles. He was part of the Mercedes Formula 1 Engineering Team that developed the 2014 FIA World Championship-winning Energy Recovery System. He has also designed power electronic converters from 5W to 100kW in a range of industries. Denis received a Diplom Ingenieur in Drives and Power Systems from the University of Applied Sciences Giessen Friedberg, Germany. During his studies he spent a year studying Digital Design at Victoria University, Melbourne as well as a year at the ABB Corporate Research Center in Vasteras, Sweden working on high efficiency Motor Control strategies of Synchronous Reluctance Machines.

Katie Critchlow portrait

Chief Operating Officer

Katie Critchlow

Katie started her career at Marks & Spencer where she was involved in developing the £200m sustainable business change programme, Plan A. After six years with M&S she spent a year consulting on green business and supply chain strategy at PwC, working with companies like Asda, Unilever and the Fairtrade Foundation.  Katie then moved to Jakarta for two years with WWF to lead WWF’s private sector engagement in Borneo before returning to the UK to take time out from her career and start a family. During this time, she gained an MSc (Distinction) in Environmental Economics and Climate Change at The LSE. Katie returned to work in 2015 and joined Powervault to gain new experience in the renewables sector because of her passion for finding solutions to climate change. Katie achieved a BSc (1st) from the University of Oxford in Biological Sciences in 2001.

Financial Controller

Viren Thakker

Viren has more than 10 years’ experience in Finance. He has worked across several industries, in businesses ranging from <£1m revenues to £multi-million revenue PLCs, and within sectors ranging from Production to Wholesale to Retail to Technology. Whilst working with Isabella Oliver (High-end Fashion brand), Chemilines Group (Pharmaceutical Distribution), Close Ventures (Investment Management) and Techspace Property Group (Co-working spaces), Viren helped a variety of organisations improve and streamline processes and procedures to maximise efficiency. Viren is a commercially astute and dedicated finance professional with well-rounded business experience, which enables him to drive growth through improvements in systems, management information, change management and cash flow management. Viren is ACA-qualified and is focused on using the right systems and processes to enable Powervault, which he joined in 2017, to grow at speed over the next few years. In his spare time, Viren likes to play his favourite sports: cricket, volleyball and table tennis.

Charlie Vey portrait

Business Development Manager

Charlie Vey

Charlie started his career at Solution Sciences, a start-up soft drinks business, where he spent two years growing the distribution, sales and marketing of Alibi Drinks amongst a variety of retailers in the U.K. Charlie then moved to Associated British Foods where he built and managed business plans and relationships with large, multinational grocers as part of a two year commercial graduate scheme. He joined Powervault in 2015 to look after sales to distributors and installers and is now working with large customers, including energy suppliers, to bring home electricity storage to the mass market. In his spare time, Charlie will be found either on his miniature-wheeled bicycle or on a pair of skis in the Alps. Charlie achieved a BA (Hons) from Durham University in Economics, Business & Geography in 2011.

Business Development Manager

Caroline Wood

After graduating in 2014 with a MSc (Hons) in Chemistry from Imperial College, London, Caroline co-founded and directed a sustainable clothes exchange service for young women. She successfully raised investment for the business, and was the winner of the Mayor of London Low Carbon Award in 2015. She joined Powervault in June 2016 to transition into the industry she is most passionate about, renewable energy. During her degree, Caroline took a sabbatical year to work on a number of social and environmental causes; she organised the UK’s largest student-led conference on climate change, created a workshop on ‘Green Chemistry’ to teach to Sixth Form students, participated in a micro-finance project in Kenya, and promoted social entrepreneurship opportunities to other students at the College. In her spare time, Caroline loves adventure travel; recent trips include climbing Mt. Kilimanjaro and learning to kite-surf. When at home in London, she enjoys cycling, yoga, spending time with friends, and seeking out the city’s best vegetarian restaurants.

Business Development Associate

Tom Ross

Tom graduated in 2013 with a BSc (Hons) in Psychology, from Goldsmiths College, London. He started his career working in Advertising, and progressed to work as a Sales Executive at Sky Media. Working as part of the Independent Agencies team, he managed a portfolio of a wide range of advertising agencies, handling an account with a monthly ad spend of over £3m. He started at Powervault in 2017, joining the Business Development team to follow a passion of sustainability and renewable energy. In his spare time, Tom enjoys playing rugby, running, and playing keyboard in a band.

Business Development Associate

Josie Middleton

Josie is a zealous business development manager who has worked across a number of sectors including government, e-commerce (Groupon GmbH), advertising (Redwood) and consultancies (Accenture) in the UK and internationally. She read French and History at the University of Nottingham and it was during a year abroad working for Gerard Bertrand in the Languedoc, that she gained her first taste of selling, and became a wine enthusiast.   She joined Powervault in 2017 to be part of the ‘clean energy’ revolution as she has a keen interest in urban development and the environment. She believes firmly that technology enables you to live smarter. Passionate about social causes, Josie also has extensive experience working in development in East and West Africa, and across the UK for the past nine years. Josie enjoys playing sports, exploring new countries, cooking for friends and trips to the seaside.

Business Development Associate

Joe Stafford

Joe started his career in the West Midlands Police, joining the Force in 2004. He worked for WMP for 9 years in various positions, including response and neighbourhood policing, youth offending and offender management, while working closely with partner agencies to rehabilitate and resettle prolific offenders into society. In 2013, Joe transferred from WMP to Thames Valley Police where he worked in the CID and investigated more serious acquisitive crime. In 2015, Joe left the Police Force and joined a private commercial property management firm as their Business Development and Operations Director. He joined Powervault in 2017 and is leading sales and distribution in South-West England from the office in Devon.


Marketing Associate

Hannah Markus

Hannah graduated in 2015 with a BA (Hons) in English and Politics from the University of Strathclyde. She also received an Erasmus Certificate in Humanities and Social Sciences from the Paris Institute of Political Studies. Since graduating, Hannah has held a variety of managerial positions within the hospitality industry, including marketing and event management, which have taken her from Glasgow to Belfast to Montréal. In 2017, Hannah joined Powervault and manages the company’s marketing and social media platforms. In her spare time, she writes her own blog, enjoys hosting extravagant parties for friends, and exploring new places around the world. In 2014, Hannah volunteered to teach English at a charity-run school in Bhadeswar, Bangladesh, which was part of a project documented by ITV.

Commercial Analyst

Nick Wood

Nick joined Powervault in 2017, having previously worked as an analyst at the Solar Trade Association focusing on rooftop solar, behind the meter storage, networks and smart power. He has an MSc in Environmental Technology from Imperial College London, where he specialised in energy policy and technology and wrote a thesis in collaboration with Ofgem on local energy systems and non-traditional business models. Prior to that, Nick managed a small fund at a charitable foundation, making grants in the environment and international development. In his spare time he enjoys going to gigs and cycling, and is trying to make a perfect pizza base.

Commercial Analyst

Ioanna Armouti

Ioanna obtained an MEng in Electrical and Computer Engineering at the National Technical University of Athens, in 2016. She specialised in the design and construction of electric motors for automotive applications and also focussed on low energy power system of prototype electric vehicles.  Ioanna’s main research was focused on single and multi-objective optimisation algorithms. She spent two years on the team of an automotive research project at NTUA, which built hand-made, eco-friendly, prototype, electric vehicles. Ioanna’s passion for green transportation methods led her to further develop her knowledge and understanding of strategies for ecological power consumption. Ioanna joined Powervault in 2017 as Commercial Analyst and enjoys helping create a greener and more sustainable planet.

Project & Operations Manager

Abe Eustice

Abe has 12 years of heavy mechanical construction experience in Northern California as an engineer and project manager.  His experience included several water pump stations, HVAC systems as well as the LEEDs California Academy of Sciences building in San Francisco.  He has been a registered Professional Mechanical Engineer in California since 2010. Prior to joining Powervault in 2017, he completed an MSc (Distinction) in Sustainable Energy Technologies and Management at Brunel University with a focus on energy storage.  He is passionate about the energy storage sector and its role in realising the potential of renewable energies. In his free time, Abe is an avid volunteer with Engineers Without Borders, The SF Guardsmen and the Energy Institute’s Young Professional Network.

Project Manager

Rachel Stanley

Rachel joined Powervault in 2016 and has a background in strategic planning, market analysis, portfolio optimisation and I.T. and technical project management within the energy market, combined with experience of getting things done in small, growing organisations. She is passionate about using this to bring about a customer-centred sustainable energy future through new business models and technology. Rachel’s experience within large corporate firms, startups and a think-tank within the energy sector has given her an understanding of the strategic, commercial and technical potential of developing and bringing to market new energy business models and customer propositions.

Head of Manufacturing & Quality

Chetan Pandya

Chetan joined Powervault in September 2016 as Head of Manufacturing & Quality. He has over 17 years of R&D, design & technology and engineering management experience in high-tech electronics and scientific instrument SMEs.  After gaining a BEng (Hons) in Mechanical Engineering, Chetan started his career in the Print & Publishing industry before moving into the IT sector. An expert in Operations, New Product Development and Project Management, Chetan has been involved in numerous projects entailing R&D, engineering concepts, engineering specifications, prototyping, software-testing and electro-mechanical hardware manufacturing. At Cyberview Technology, Chetan was part of the team that designed high integrity, complex and innovative hardware and software for the gaming and betting industry. At Duvas Technologies, Chetan oversaw Operations and developed and managed the team responsible for designing an electro-optical scientific instrument for ambient air quality monitoring.  When Chetan is not tinkering with technology, he enjoys walking, gardening and exploring different cultures by visiting new places.

Systems Engineer

Oliver Clay

Oliver gained his degree, MEng Mechatronics, in South Wales, before starting his first job as an embedded software engineer at The Foreign & Commonwealth Office (FCO). During this time, he renovated a canal boat and installed a custom Combined Heat & Power unit and a 32kWh domestic battery/inverter system to the boat, which enabled him to live on the canal ‘off-grid’. After 4 years with The FCO, Oliver moved back to South Wales to work for Guardian Global Technologies where he was involved in the hardware, firmware and software design and testing of downhole tools and communication equipment for the oil & gas industry. In 2016, Oliver joined Magstim, a medical device company, as a Software Engineer; there he developed firmware for Transcranial Magnetic Stimulation (TMS) equipment, which is used as a treatment for depression and as an alternative to Electroconvulsive Therapy. Following his passion for all things batteries, Oliver joined Powervault in 2017 as Systems Engineer. Oliver is a STEM ambassador and has been judge for the ‘First LEGO League’ in South Wales. In his spare time, after spending time with his daughter & identical twin boys, Oliver turns to model engineering: mainly steam engines, but also aircraft, rockets, boats, and hovercraft.

Senior Firmware Engineer

Nicolas Rocha

Nicolas started his career in 2006 working for high-tech electronic consultancy companies which involved his development, system design and verification of new electronic products. After moving to the U.K. in 2008, Nicolas worked for the water industry where he was part of the team that developed an M2M water leak detection system, which became a key enabler for the smart water networks. He then moved to General Electric Oil & Gas where he spent 5 years working on the development of embedded firmware / hardware for a different range of sensors used in oil & gas exploration. He also supported field trials of new products and implemented design enhancements for manufacture procedures. Nicolas’ passion for the ‘Internet of Things’ and renewable energies lead him to join Powervault in 2017. Nicolas gained a BSc in Electronics from the Colombian School of Engineering and an MScs in Embedded and Distributed Systems from London South Bank University. He enjoys spending time with his daughter, strumming his guitar and playing beach volleyball in his spare time.

Senior Software Engineer

Prashant Tiwari

With over 10 years of experience using open source tools, Prashant brings a wealth of I.T. experience to Powervault. He has extensive experience in Banking and Finance Domain, having worked in the front office teams of one of the world’s largest Tier 1 investment banking firms for 7 years. Prashant is also actively involved in the open source community in the U.K. and is one of the co-organisers of ‘PyData London’. Owing to his contributions to the U.K.’s digital economy, Prashant has been endorsed by Tech City UK via their ‘Tier 1 Exceptional Talent Visa for Digital Technology’.  Although he is a Pythonista at heart, Prashant is also a long term Linux enthusiast. He joined Powervault in 2016 and leads the backend software development of Powervault’s smart, cloud-connected products; he is responsible for managing all Python-based components deployed in the cloud and is leading the development of Powervault’s flagship software products and features.

Software Engineer

Andrew Kenyon

Andrew has been a professional Software Engineer for over 6 years specialising in API development and integration. After starting his career working on the entry system for the London Marathon, he has gone on to work in a broad range of fields, including mobile gaming, loyalty schemes and payment card interrogations. In his spare time Andrew enjoys walking, skiing, photography, travel and programming for worthy causes to alleviate poverty in Africa. He holds a BSc(Hons) in Computer Science.

Daniel Petry portrait

Software Engineer

Daniel Petry

Daniel has a background in engineering and physical sciences but has since gained extensive experience in software engineering. Daniel’s career has involved work in a range of high-tech sectors, including space, cleantech, and aerospace. He has developed technology in areas such as radar signal processing, robotic control, and satellite on board computer software and has skills encompassing a range of embedded and cloud technologies. He is also an electronic musician and music writer; his music has been released and published internationally. He achieved a BA from the University of Cambridge in Natural Sciences in 2004 and subsequently studied an MSc in Mechatronics at King’s College London.

Razvan Vasiliu portrait

Product Engineer

Razvan Vasiliu

Razvan started his career working in the audio industry performing electronic repairs for both corporate and private customers. He joined Powervault in 2015 and splits his time between testing and evaluating new Powervault iterations in the lab and remotely analysing customers’ Powervault performance. Razvan obtained a BEng (Hons) from the University of Manchester in Electronic Engineering in 2015. In his spare time he enjoys building highly inefficient tube amplifiers and playing his guitar in a band.

Senior Electronics Engineer

Jorge Perez

Before joining Powervault in September 2016, Jorge had worked in the Power Electronics sector for over 10 years – both in Spain and the UK. He has designed DC-DC Converters and DC-AC Inverters (up to 460kVA), both 1- and 3-phase, for induction and DC motors speed control. He developed projects for analogue circuit design, intended for SMPS control circuitry, as well as instrumentation equipment for the mining industry. Jorge also designed a system for aircrafts in Niagara, USA, intended for airborne ground gravimetric and magnetic signal logging for Oil & Gas exploration, carrying out in-flight system testing under various conditions: altitude, engines propulsion and torque, regime of turbulences. Jorge holds a MSc (Hons) Mining Engineering, specialising in Electrical Engineering and Electronics. In his spare time, Jorge likes spending time with his camera and listening to music.

Electronics Engineer

Luis Ramirez

Luis started his career as an electronics design engineer in 2005, developing control systems and power electronics for the elevators and lifts industry. While studying for his Masters Degree in Electronics Engineering in 2010, Luis continued to design electronics and spent time developing ultrasound cleaning machines. After moving to the U.K., Luis started developing power electronic devices and IoT products for the automotive and marine market before joining Powervault as an Electronics Engineer in 2017.

Electronics Engineer

Enrique Castillo

Enrique, originally from Spain, studied in Santiago de Compostela and received a diploma in Science and Technology. His passion for technology and, in particular, clean technologies, spurred him to study Energy Engineering at the Universidad de Vigo, which is the only university in Spain to offer such a specialist course. Enrique enjoys spending time in different countries and therefore decided to study for his thesis on Second Generation Renewable Biofuels at the Universita degli studi di Perugia, in Italy, where he obtained excellent results in transforming Eucalyptus bark into ethanol. Enrique moved to London in 2017 to begin an engineering internship with Powervault. After three months as an intern, he joined the team as a full-time testing engineer. Enrique is mostly involved in the design, development and testing of Powervault’s second-life battery product.  In his free time, Enrique enjoys playing football, surfing in Spain, and strumming his guitar in the evenings.

Customer Service Engineer

Gregory Lubala

Before joining Powervault in 2016, Gregory spent two years working for BBOXX solar energy in Sierra Leone as Technical Director. Gregory lead the design and installation of solar hybrid, off-grid and back-up systems countrywide. Prior to this, Gregory was an electrician and company owner of LinkFix-It in Zambia, where he worked on many different electrical projects in domestic, commercial and industrial environments. Gregory is an experienced technician specialising in electrical, electronic engineering and general repairs. He holds an IVQ Electrical and Electronic Engineering diploma and has over 7 years of electrical experience. Gregory is an active and creative individual, with an interest in sports such as basketball and salsa dancing, and arts and crafts.

Office Manager

Emma Cook

Emma graduated from Canterbury University in 2010 before joining Office Angels as a free-lance administrator and PA for two years. At Office Angels she worked in a variety of businesses before joining a large air conditioning company full-time where she was in charge of all office administration. In 2016, Emma joined PricewaterhouseCoopers where she supported senior management and organised the administration of a wide range of services and facilities. Emma started at Powervault as Office Manager in 2017 and enjoys cooking and making jewellery in her spare time.

The Board of Directors

The board of directors offers a wealth of experience and support to the Powervault team.


Simon Acland

Simon is an active business angel investor in green technology. He sits on the board of two Triple Point VCTs, which invest primarily in renewable energy, and is a member of the investment committee of the British Business Bank’s Angel CoFund. He is an advisor to the Green Angel Syndicate and is also a Trustee of Plantlife, the UK’s main wild plant conservation charity. Simon has spent 30 years investing in young technology businesses. Much of his venture capital career was spent as Managing Director of Quester, which became one of the UK’s most active early stage technology investors. Seven of the companies that he has backed achieved public listings on the London Stock Exchange, AIM, Nasdaq or Easdaq, including two companies which reached the FTSE 250; many others have been successfully sold. He joined the Powervault board in 2012 when he was the lead angel investor in the first funding round.


Andrew Wordsworth

As former Managing Director of Carbon Trust Enterprises, Andrew has previously led the creation and launch of twelve low carbon companies, which have secured over £250m in equity commitments. A former process control engineer with Esso Petroleum, Andrew has strategic consulting experience with Bain and Arthur D Little.  Andrew is Co-Founder of Sustainable Ventures Development Partners (SVDP); in 2015 he led the exit of SVDP’s first start-up, E-Car Club, to Europcar in what is now recognised as the UK’s first successful crowdfunding exit. Andrew holds a first-class MEng in Chemical Engineering from the University of Cambridge, where he was awarded the University Fox Prize. He was named ‘Entrepreneur of the Year’ by businessGreen in 2015.

Board Member

Paul Roberts

After a successful executive career in Asset Finance (Lex Service plc and GE Capital) and Private Equity (TDR Capital), Paul is now building a portfolio of investments in the renewable energy sector. He has an MA in Economics from the University of Cambridge and an MBA from the University of Warwick.

Board Member

Vitaly Lazorin

Vitaly is the CEO and Managing Partner of Future Matters, a privately-held, London-based investment firm. Future Matters focusses its investments in the UK and Europe in a diversified portfolio of early-stage companies operating in clean tech and digital technology industries with potential for a multiple increase in value and market leadership.

Vitaly began his professional career in 1992 as an Audit Assistant at Price Waterhouse (now PricewaterhouseCoopers). He worked as the Financial Controller of the Lower Volga EBRD-sponsored regional venture fund, and then as Investment Associate at The Carlyle Group. Vitaly holds a degree in International Economics Relations from the Moscow State Institute of International Relations (MGIMO). He is a Chartered Certified Accountant.

Board Member

Nick Lyth

Nick joined the Powervault Board in June 2016. He is co-founder and director of Green Angel Syndicate (GAS), the first business angel syndicate in the UK to specialise in investments in energy and water sectors. Nick is a marketing and sales specialist with over ten years’ experience building up a new applied research institute in the eco and environmental arena: International Resources and Recycling Institute (IRRI).

Nick has been asked to speak at numerous conferences around the UK and Europe on matters concerning sustainable resources, and has been invited to assess innovation competitions in the UK run by the Technology Strategy Board (now Innovate UK) and Scottish Government.

Nick founded GAS in order to use the knowledge gained from the research world to help to commercialise resource use innovations effectively and successfully, for the greater benefit of the green economy.

Board Member

Niko Miaoulis

Niko Miaoulis is the Founder and Managing Director of Greenman Solar, a large and reputable solar PV installer based in Ashford, Kent. Niko brings significant solar PV expertise to the Powervault board and has 25 years of high-end engineering experience in the semiconductor, electronic and software markets. He has worked with LSI Logic, Marconi, Seagate, Cookson Group, NEC and IBM. He has also held director level sales and marketing posts in a number of these companies.

Board Member

James Byrne

James Byrne is a Venture Director and is responsible for venture development across the Sustainable Ventures group. He co-founded the Green Light Distrikt, an international network for young entrepreneurs and innovators in Cleantech, and has over six years of experience in technology and sustainability start-ups. He currently advises the Mayor of London as a Commissioner on the London Sustainable Development Commission and was named a Future Leader by the UK-Green Building Council. James holds an MSc in International Technology Management from the University of Warwick and a BSc from the University of Leeds.