Industry figures estimate that utility invoices contain errors of between 3% and 5% by value of overcharging and with ever more complex contracts being used this looks set to continue.

The optima™ Utility Billing System is a fully audited energy accounting system for validating and managing the payment of invoices received in either electronic or paper form. UBS performs over 60 separate checks to identify any errors on supplier invoices so that action can be taken to recover overcharges as quickly as possible.

Electronic billing through EDI or XML saves a huge amount of time in loading invoices and eliminates keying errors and optima™ supports all electricity, gas and water supplier formats. Thousands of invoices can be loaded and validated within hours rather than weeks, invoices are validated against a rigorous set of criteria to ensure that any errors are highlighted prior to payment.

Our invoice validation software checks and validates all electricity pass through charges. This means we’re able to check and anlayse even the most complex electricity contracts -and ensure accurate calculation of all pass-through charges including DUoS, Triads, DUoS & TUoS losses, BSUoS, AAHEDC, Renewable Obligation, Meter Operations DC/DA and CCL, FiT and CM. In fact, we are the only invoice validation platform to do this and we will continue to do this after the Target Charging Review is introduced.

For gas contracts, our software will validate the transportation charges on pass-through contracts, and even check that the calorific value is calculated correctly.

optima™ will automatically handle Withdrawn and Amended bills and allow splitting of bills that contain brought forward balances or multiple months of invoice data. Any problem bills that cannot be resolved can either be rejected or placed in suspense for resolution later. Integration with all known finance systems such as SAP™ or Oracle™ is also provided so that detailed costing information can be transferred into corporate accounts without the need for rekeying data.


Identifies overcharges

Validates even the most complex invoices

Over 60 separate checks

Saves time with electronic (EDI) billing

Supports all supplier electronic formats

Automatically handles credits

Reject or suspend problem invoices

Dedicated payment process

Interfaces with finance systems

Fully audit trailed

Our Products

Want to see more? Get in touch to arrange a demo


About us
Established in 1988 originally as a partnership and incorporated in 1991, Optima develop and support advanced software for managing and analysing energy data for some of the largest energy users and consultants in the UK.

  • BSI 27001 certified
  • BSI 22301 certified
  • BSI 9001 certified