National energy provider Tenaga Nasional Bhd (TNB) today said its focus remains on resolving complaints about high electricity bills, amid a minister's warning of a fine for the power giant's reported technical problems.

In urging more disgruntled customers to formally lodge their complaints, TNB chief executive officer Amir Hamzah Azizan said all efforts were being made to address 14,469 existing complaints received through its Kedai Tenaga outlets and TNB Careline hotline since last month.

"From this figure, 11,331 complaints have been resolved. Only 3,318 are still being investigated," Amir Hamzah told a press conference at the TNB headquarters in Kuala Lumpur today.