KUALA LUMPUR: Tenaga Nasional Bhd (TNB) should give a concrete explanation for the sudden discre­pancies in electricity bills and take holistic steps instead of just depending on complaints from users, say consumer groups.

Consumers Association of Penang (CAP) education officer N.V. Sub­barao said TNB, as the national utility company, must take responsibility instead of depending on consumers to come forward and lodge reports.