On Tuesday Nurul Amin reportedly submitted his resignation letter to the President's Office citing personal reasons.
Energy secretary Md Nurul Alam, however, said he was not informed about the matter.
The appointment of the BERC chairman is made by the President of the country.
The officers and employees of the commission have been staging a movement seeking removal of the BERC chairman and other members since the fall of the Awami League government, reports UNB.
They submitted a memorandum to the chief adviser of the interim government on August 14 to realise their demand. They mentioned in the memorandum about various irregularities and inconsistencies in works of the commission.
On August 13, they gave an ultimatum for the resignation of the chairman and members from a joint meeting of the officers and employees.
They also went for a strike from August 18 demanding the resignation of the chairman and members.
On Tuesday, officials and employees of the BERC observed a sit-in strike programme on the office premises by closing the main gate. On this day, as the chairman and 3 members of the commission refrained from coming to their offices..