Calisen’s 1,000+ strong workforce serves the entire nation
Our fully nationwide flexible team can take care of your customers, wherever they are in Britain. Our clients benefit from Calisen’s insights gained from over 28 years of experience installing and funding millions of smart meters across multiple customers and manufacturers.
We’ve transformed from a pure metering business into a smart energy infrastructure company
For more than two decades, Calisen has been shaping the UK’s smart energy landscape. What began with Calvin Capital and Lowri Beck, two pioneers of smart metering, has evolved into one company with a shared vision, united under the Calisen name.
Today, that legacy of expertise and innovation drives us forward. With the acquisitions of Advizzo, MapleCo, and Utility Warehouse Home Services, and the launch of commercial solar and battery services, we are accelerating our growth as one of the UK’s largest providers of energy transition technology for homes and businesses.
We offer complete installation, maintenance and management for your smart technologies, covering lead generation, outreach, appointment booking and reporting, commissioning, communication hub power-cycles, SIM and modem exchanges. Our purpose is clear: to deliver Smarter Energy for All. By combining heritage, innovation, and a single united strategy, we are helping build a cleaner, greener energy future.
Calisen has a track record in leading the way on the digitalisation of the energy meter network, rolling out millions of smart meters in homes and businesses across the UK. With the exponential change in both the maturity and cost of low carbon technologies, smart meters will unlock a cleaner energy future for us all. Catherine O'Kelly
CEO
Shaped by sustainability
We help the UK meet its climate targets by supporting the rollout of smart meters and other smart infrastructure across Great Britain. We track the installation of smart devices against our targets as we assess how Calisen makes the UK energy system more sustainable. We achieve success together, embracing our differences and enabling everyone to thrive in our inclusive culture.
We support the economic and social development of our communities and promote sustainable living through training, education, information, resources and charitable support.
Explore our services
Calisen is the largest owner and manager of smart meters in Great Britain, enabling our clients to save money and reduce their carbon usage.
Supporting our customers beyond initial installation.
Our suite of products that has been designed to help bolster the maintenance and functionality of the smart meter network.
Calisen provides meter reading services and tailored solutions in support of the gas, electricity and water markets.
OUR IMPACT
- 40% OF SMART METERS CURRENTLY INSTALLED IN GREAT BRITAIN ARE OWNED BY CALISEN
- 16M+ METERS THAT WE OWN, TRACK AND MANAGE WITHIN OUR PORTFOLIO
- 7.4M TONNES OF CARBON WILL BE SAVED BY OUR INSTALLED SMART METERS BY 2039
- 6s EVERY 6 SECONDS ONE OF OUR TECHNICANS VISITS A CUSTOMERS HOME
Meet our executive team
Walter joined Calisen as Group Chair in March 2025, and has served as Senior Advisor to EQT AB since 2016. Walter’s previous roles include Chief Financial Officer for energy and metering service provider Techem AG and Chief Executive Officer for ista International and ista Germany, who manufacture and provide energy measuring solutions for apartment buildings and commercial properties worldwide. Walter has also been President of the European Association for Energy Cost Allocation and Chairperson of both Deutsche Glasfaser and G+E GETEC Holding.
Walter Schmidt
Group Chair
Catherine O’Kelly joined Calisen as Chief Executive Officer in October 2025, bringing over 15 years of leadership experience from Centrica. During her tenure there, she served as Managing Director at Bord Gáis Energy in Ireland and most recently led British Gas Energy. Catherine has also held Board trustee roles, including with the Peabody Community Foundation. She is passionate about driving data-led innovation and accelerating Calisen’s role at the forefront of the UK’s smart energy transition.
Brandon joined Calisen in December 2022 as Chief Financial Officer. Prior to joining Calisen, Brandon served as CFO of Thames Water. Previously he was at SSE plc in a range of senior finance roles, including Managing Director for Finance (2013 – 2017). Most recently, he was CFO at Storegga, the international project developer focused primarily on carbon capture and storage. Brandon brings over 20 years’ experience working on critical national infrastructure projects from a variety of perspectives.
San is a highly experienced professional who joined Calisen in July 2023. In her current role, San is responsible for overseeing the overall People delivery of the Group. Prior to joining Calisen, San held the position of Chief People Officer at EDF Renewables UK and Executive Director of Human Resources & OD at Highways England. San is also a Chartered Fellow (FCIPD) and has over ten years of experience at a senior level.
Matthew joined Calisen at the beginning of October 2022 as Chief Operating Officer. Prior to this he worked for Centrica plc for 24 years leading various business units including as Managing Director, British Gas and his most recent role as MD, British Gas Services and Solutions. His responsibilities included the Smart Metering programme as well as being CEO of British Gas’ Insurance business.
