Participants in the ACT's feed-in tariff scheme may have been paid the wrong rate for their solar electricity, with a system-wide audit underway to determine the scale of the problem.
The scheme, which closed to new participants in 2011, paid home owners for the electricity they fed into the network from their rooftop solar panels, with different rates per kilowatt hour for small, medium and large-scale generation.
However it is understood some solar systems had been recorded in the wrong sized categories. Larger systems attract a bigger tariff under the scheme, meaning participants classified in a higher category than they should have been were paid more while those put in a lower category were paid less.
An Evoenergy spokeswoman said the ACT government noticed a discrepancy in its data in 2017, prompting the company to check and update the accuracy of the information at the source.
"Our review found that as data was migrated between our systems, additional checks were required to ensure the data was appropriately categorised and also accurately captured the solar inverter make, model and capacity details," a spokeswoman said.
"As a result of our review, we completed a data remediation project which included working closely with industry and customers to check and update the accuracy of source data.
"All identified data issues have been resolved and we will ensure no customers are out of pocket as a result of previous data discrepancies. Any original incorrect categorisation of panels/inverters will have had no effect on customers receiving premium feed-in tariffs."
The ACT government audit will be released later in 2019. Residents concerned about their solar feed-in tariff can contact Evoenergy on 13 23 86.