NHHMoA - Non Half Hourly Meter Operations.

Callisto have been a fully Elexon-accredited Meter Operator (MOP) since 2010. Ensuring the industry data flows are correctly managed is of paramount importance to ensure that suppliers meet their obligations and can correctly bill their customers. 


Callisto now manages the industry flows for over 6.1 million electricity meter assets across several Energy Retailers through our highly automated, bespoke MOP system. 

As part of MGroup services we have field capability, however we can host and manage your data even if you continue to carry out the field services yourself. 

Contact us today to find out more.



using the latest technolagy.

Experts in settlement performance - since our market inception, we’ve consistently demonstrated an exemplary record, with a robust settlement process that complements our customers best practice for customer services and billing.

Ensuring data security is at the core of our operations. We ensure the integrity and security of customer information by designing security into our systems and processes. This is further supported through the use of secure data centres. 

Our Data Management services are delivered with a comprehensive quality assurance commitment. Business management processes are certified to ISO 9001 and information security management systems are certified to ISO 27001 providing complete security assurance.