Our Company

Our Mission

To create sustainable value through the use of smart technology within the residential energy supply market.


Keeping on top of over 40,000 rooftops


Improving IRR by between 7% to 15%


Saving in heating consumption

Our promise


We are on a mission to make energy systems more efficient for our business partners and their customers. We have developed an “open” smart, connected IOT platform for energy markets. We describe our innovative approach as placing a digital canopy over residential energy systems. Knowledge from our integrated meter data collection, pre-payment, fault reporting and in home control services can be aggregated to create sustainable value from managing flexibility at the point of generation.

Our solutions consist of software that uses learnt behavior and predictive control to deliver reduced lifetime cost of asset ownership, improved IRR and lower cost to serve. Our services have been designed to integrate easily with your existing CRM, billing and workflow management systems.

Management Team

Colin Calder

Colin Calder

Chief Executive and Founder

Colin founded the business in 2008 following extensive research into zero-carbon homes and the roll-out of smart meters to domestic homes in Italy. He is a Fellow of the Energy Institute and an Advisory Board Member to UCL’s International Energy Institute. He is a founding member of Energy UK’s New Energy Services & Heat Committee and his company is a member of the Smart Power Industries Alliance.

He is a regular speaker at local and international conferences including World Energy Congress, United Nations sustainable Energy for All and World Economic Forum (WEF). His company has won numerous awards including WEF Technology Pioneer, Global Cleanteh 100 and UCL Knowledge Transfer Business of the Year.

In 1996 Colin founded Paragon, a software company focused on synchronising data between mobile phones, desktop applications and web-based services, which he sold 3 years later for $500 million to phone.com. In 1999 he was a winner of the prestigious EY Entrepreneur of the Year award.

Along with his work in the technology sector, Colin has also held the positions of Director of X/Open (now The Open Group), a global consortium of technology manufacturers working to promote open standards in the field of information technology. He has also acted as an advisor to the European Commission, European Parliament and the UK Parliamentary Affairs Committee on proposed changes to European legislation permitting the reverse engineering of interface specifications, a change which led to the dramatic rise of open systems and distributed computing.

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Jim Crooks

Jim Crooks

Chief Operating Officer

Jim has 25 years of senior management experience in B2B Services. He was Managing Director of ADT Fire & Security and Rentokil Initial Fire Services and held senior finance, operational and project roles at Chubb Electronic Security. He has extensive experience of change management and profit improvement in multi-site service businesses delivering installation and field service solutions across a range of different environments. He is a Chartered Accountant and has a degree in Classics from Oxford University.

Fraser Harding

Fraser Harding

VP Engineering

Fraser brings over 20 years of commercial technology consulting and development experience to Passiv. Most recently Fraser has held executive positions at a number of young organisations bringing innovative technology solutions to market. Fraser was a founding member of Paragon Software, one of the UK’s most successful technology startups, and was instrumental in building the company to be a world leader in mobile synchronisation.

Ian Rose

Ian Rose

Professional Services Director

Ian has over 20 years’ experience in the utilities sector delivering innovative technology and service solutions. He manages Passiv’s innovation projects and products, with a focus on extracting energy system value from flexible heat, power and transport solutions to support the net zero transition.

Katharine Harrison

Katharine Harrison

Service and Operations Director

Katharine has five years of operational experience in the PV and smart heating space and brings 10 years of customer service experience, having previously worked in customer-facing roles for Morgan Stanley and Credit Suisse. Katharine has been instrumental in expanding Passiv’s support capabilities, effecting process improvements and driving operational efficiencies over the past five years.