With consent of parties all these writ applications in which common questions are involved have been heard together, in detail, for their disposal at the admission stage itself.

2. In all the applications the challenge to the various provisions of the revised tariff notified by the Bihar State Electricity Board, Patna (hereinafter referred to as ‘the Board'), vide Notification No. COM/TAR-1010/90-181 dated 26th August, 1991, in super-session of the earlier notification dated 17th June, 1983 has been made. The impugned notification is purported to have been issued in exercise of the powers conferred under sections 46 and 49 of the Electricity (Supply) Act, 1948 (hereinafter referred to as 'the 1948 Act'), with the approval of the State Government. By this various changes have been made with regard to high tension service consumer, low tension service consumer, domestic consumer and commercial consumer. The petitioners have challenged only the validity of formulation of tariff applicable to high tension service-I consumer (in short 'HTS-I') and low tension industrial service consumer (in short 'LTIS') such as, clause 15.2, 16.2(d), 16.6(f) & (g), 16.7(f), 16.8, enhancement in the