Pioneers in sustainable energy

Switching the UK to smart sustainable energy

We're leading the smart energy technology revolution

We're passionate and committed to delivering smart energy for all and creating lasting change for our communities and the environment for generations to come.


Our expertise is to procure, install, service, finance, and track millions of smart energy infrastructure assets that collectively make a big difference to carbon usage.


This approach offers our customers a simple, one-stop solution, reframing smart energy as a service and providing a seamless experience, making reaching net zero goals as easy as possible.



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Find out how we do it...

The countdown to zero has begun

The countdown to zero has begun, and for every piece of large green energy infrastructure, we need to finance, install and service millions of small smart energy devices. Our mission is to enable smarter energy for all, so the transition needs to be as easy as possible. With Calisen, net zero has never been so easy for businesses – zero upfront cost, zero hassle and zero worries. We’ll never stop making the smarter future easier, because zero has never meant so much.

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Our Mission

Our mission is to lead the way in smarter, more sustainable energy. We’re committed to innovating, exploring and pushing the boundaries of what’s possible to deliver the infrastructure and technology that powers our world more sustainably.

Our company values

We are one team.

We put safety and wellbeing first.

We do the right thing.

We care.

We build for the future.

A company built on heritage and purpose


With our roots firmly laid down in smart energy technology for over 20 years, Calisen has been on a transformation journey to become the industry leader we are today.


Our heritage has been built upon the deep knowledge, experience and passion created by our legacy companies Calvin Capital and Lowri Beck, to bring smart metering to the UK. With those companies now united under the Calisen brand name, we move forward stronger as one team with one corporate identity.


With the launch of Plug Me In and the acquisitions of Advizzo, MapleCo and Utility Warehouse Home Service, we move forward to becoming one of the UK’s largest owner and installer of energy transition technology for homes and businesses. With one strategy and one team our deep sense of purpose sets us apart – to deliver Smarter Energy for All, building a cleaner and greener future for all.

14 Million meters installed

Calisen reach a major milestone, installing over 14 million meters, showcasing its growth and scale as it becomes the market leader in Great Britain.

Acquisition of MapleCo

Acquisition of MapleCo extends Calisen's services to more UK energy retailers in support of its mission – Smarter Energy for All.

Acquisition of Advizzo

Calisen acquires smart meter behavioural and data science software company, Advizzo.

Acquisition of heat pump businesses

Calisen acquires Ecofit Renewables and Source Eco, two heat pump installation businesses enabling Calisen to expand its range of activities.

Acquisition of Utility Warehouse Home Services

Acquisition of Utility Warehouse Home Services, providing customers with a broader smart meter service offering.

Plug Me In launched

Plug Me In launched, offering EV charging solutions to homes and businesses.

Acquisition of Lowri Beck

The acquisition of Lowri Beck reinforces Calisen's metering vision, enhancing services and expanding domestic offerings.

Over 11 Million meters installed

Calisen installed over 11 million meters, showcasing its rapid growth.

Creation of Calvin Australia Pty Limited

Calisen extended its global reach with the inauguration of Calvin Australia Pty Limited.

First SMETS2 installed

Calisen adopted advanced metering with its first SMETS2 installation, emphasizing innovation.

First SMETS1 installed

First SMETS1 installed with a major contract win.

3.5 million meters installed

3.5 million traditional meters installed

1 million meters installed

1 million traditional meters installed, with a big contract win for one of the 'big 5' energy suppliers.

Meet our Board and Executive Team

Bert Pijls

Bert Pijls was appointed as Chair in July 2021. He joined Calisen in September 2017 as Chief Executive Officer, following a successful career in financial services and utilities spanning 30 years. Prior to joining Calisen he worked in the financial services industry as CEO of Hellenic Bank, Managing Director at Citibank and CEO of Egg Banking. In addition to his experience in the financial services industry, Bert worked in the energy sector as Managing Director for Customer Service and Commercial at British Gas/Centrica.

Sean Latus

Sean became Group CEO in July 2021 having held a number of senior roles in the business since joining in October 2014. Initially as Chief Investment Officer, he helped transition the business from an owner of traditional meters to being a broader provider of energy infrastructure services to the retail market. Sean held the CFO position in February 2018 until he became Group CEO. Sean’s previous roles include Head of Investments at Costain plc, Senior Director at RBS Project and Infrastructure Finance, and Investment Director at John Laing.

Sarah Blackburn

Sarah Blackburn joined Calisen in April 2014 and was appointed as Chief Commercial Officer and General Counsel from 1 July 2021. Prior to that Sarah was part of the senior management team as General Counsel and Company Secretary. Sarah is responsible for leading the commercial, transactions and legal teams within the Group. She is a qualified lawyer with over 20 years of experience in a broad range of commercial transactions, infrastructure, M&A and finance.

Brandon Rennet

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.

Matthew Bateman

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.

San Johal

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.

Smart energy is here to stay. Don’t get left behind.

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