Power NI is being asked to appear before a Stormont watchdog committee to explain why it is increasing electricity prices by almost a fifth.
Northern Ireland's biggest electricity supplier caused fury when it announced the 18% price hike, which will mean a family's bills will increase by an average of £90 a year.
The announcement means an extra £1.73 a week in electricity costs for a typical household from July 1 and will make annual bills to £30 more expensive than the rest of the UK.
Now the Assembly's enterprise, trade and investment committee has agreed to press Power NI for information on the details and reasons behind the rise.
The committee also wants to hear from Northern Ireland's departing Utility Regulator Shane Lynch, who approved the rise, and Manufacturing NI, which represents companies that will suffer due to it.
Committee chairman Patsy McGlone said: "Following Power NI's announcement earlier this week, the committee agreed to urge all three organisations to address this issue during their presentations to the committee."